AutoScroll Tree View while searching a Tree Node
HI all,
I have two Tabs Tab1 contains JTree (with JScrollPane) , Tab 2 contains some data (which are available in tree node name in Tab 1) which is to be searched in tree in Tab1 & highlight node in red Color & its sub-nodes are in expanded state .
I Click some Button on my Tab2 & i search the node & Display Tab1 with selected Node
I have completed the above said functionality but, the node to be searched is far below (i.e. visible only if scrolled)
I need to Scroll it manually so see the highlighted Node , i want the scroller should be automatically adjusted!!
when i click Search button in Tab 2
Similar to functionality in JTree like - if you resize the window very small and keep the node (not in view) & try to type the node name JTree adjust the scroller & display the node.
Yes. rite i just found answer aftre posting the question
tree.scrollPathToVisible(path);
Similar Messages
-
Click on the searched hierachical tree node
Hi,
when i search the hierarchical tree for a string then all the matching nodes come selected.Then when i click on any of the search result nodes it does not work and otherwise i have to click on a non selected node and then click on the desired node .
For example i have created a tree for material used for manufacturing purpose.i want to display the related suppliers names in an adjacent grid by clicking on the node in the tree. how can i do that directly after getting the search node.??Bibekananda wrote:
Hi,
when i search the hierarchical tree for a string then all the matching nodes come selected.Then when i click on any of the search result nodes it does not work and otherwise i have to click on a non selected node and then click on the desired node .
For example i have created a tree for material used for manufacturing purpose.i want to display the related suppliers names in an adjacent grid by clicking on the node in the tree. how can i do that directly after getting the search node.??hi
i hope i get you
i think you have a form contain a block for tree and another block build on a database table and you want to execute query on the block when you select a node
and you have a search item to seach for a node and want to go to the block record when you clock on search without go to the node and select
try this in search button or when-validate-item of the search key
-- create a pkg specifiaction called tree_pkg and define the follwing variable
--node ftree.node;
PROCEDURE select_node IS
node ftree.node;
htree item;
node_label varchar2(3000);
node_val varchar2(3000);
state varchar2(3000);
begin
htree := find_item('BLOCK.TREE_ITEM');
node := Ftree.Find_Tree_Node(htree, '');
ftree.set_tree_selection(htree,node,ftree.select_on) ;
WHILE NOT Ftree.ID_NULL(node) LOOP
state := Ftree.Get_Tree_Node_Property(htree, node, Ftree.NODE_STATE);
node_label := Ftree.Get_Tree_Node_Property(htree, node, Ftree.NODE_label);
node_val := Ftree.Get_Tree_Node_Property(htree, node, Ftree.NODE_value);
if upper(node_label) like <your search item> then
ftree.set_tree_selection(htree,node,ftree.select_on) ;
tree_pkg.node := node;
exit;
end if;
node := Ftree.Find_Tree_Node(htree, '', ftree.find_NEXT,Ftree.NODE_LABEL,'', node);
END LOOP;
---- now you have the node number that result from search
node_val := Ftree.Get_Tree_Node_Property(htree, tree_pkg.node, Ftree.NODE_value);
-- then use this value in execute query on the supplier block
END;
try and respond -
I have a HTML page with an IFrame. Inside the Iframe there is a table with a tree view
<iframe>
<table>
<tr>
<td>
<treeview id="tv1"></treeview>
</td>
</tr>
</table>
</iframe>
In UIA, i am able to traverse till the tree view but not able to see it.
I have used the TreeWalker.RawViewWalker Field to traverse the node from the desktop Automation.RootElement.
I tried to use AutomationElement.FromPoint method to check whether i am able to get that element. Fortunately i was able to get the automation element.
i tried to get the path to root element from the node element using the TreeWalker.RawViewWalker. I was able to get the parent path to the root element.
But trying the reverse way like navigating from root element to tree node, was not getting the element for me.
Please help me with suggestions or inputs to resolve this issue.Thanks Bernard,
It works fine with JInitiator but not working with
the JPI. For JPI what settings I need to do ??hi TKARIM and Bernard, i am having similar problem even with the Bernard's recommended setup. could you post the webutiljini.htm (i presume you are using config=test) ?
i am actually using jinitiator 1.3.1.28 with Oracle HTTP Server of OAS 10gR2) calling Forms Server 6i (f60cgi). After setting up according to Bernard's recommended setup steps, the java console showed that it loaded the icon jar file when it could not read the form, but it skipped the loading of the icon jar file once it read and started the form. How do we specify in the form to pick up the icon from the jar file instead from a directory ? Or do we need to specify ? Any ideas ?
Thx and Regards
dkklau -
How-to synchronize edit forms for a single View Object tree node entrie
Hi all,
I created a tree from a single View Object,
follow this [http://www.oracle.com/technetwork/developer-tools/adf/learnmore/32-tree-table-from-single-vo-169174.pdf]
then i want to create and synchronize edit forms for tree node entries,
follow this [http://www.oracle.com/technetwork/developer-tools/adf/learnmore/50-synchromize-form-treeselection-169192.pdf]
but it not working when i click child node!!
i found the latter tree from many View Object ,but the former tree from single View Object.
what should i do?
Thanks in advanceHi,
say the tree is built from ViewObject1. In the AM model, create a second View Object instance for this. Say ViewObject2. Create the form from ViewObject2 and the tree from ViewObject1. When creating the tree, use the"Target Data Source" option at the bottom to reference the iterator of ViewObject2. Then create a PartialTrigger on the paneFormLayout that holds the synch form. In the partial trigger property, reference the tree so that when the tree selection changes, the form is updated. Then create a PartialTrigger property on the tree and point it to the submit button of the form so you can show updated values in the tree.
Frank -
How to display a search(query) on a report clicking on a tree node to open
I need to know how can I do with that when I press on the link(on a tree node(leaf)), open on the other region in the same page a classic or interactive report with my results(passed by parameter, example: ID).
One example are present on web site posted below:
http://apex.oracle.com/pls/apex/f?p=36648:34:1599336964673301::NO:::
I have tried this to composite my tree:
select case when connect_by_isleaf = 1 then 0 when level = 1 then 1 else -1 end as status, level, "NAME" as title, null as icon, "ID" as value, null as tooltip, decode(level, 1, 'f?p=&APP_ID.:106:'||:APP_SESSION||'::::P106_MAQ_ID:'||ID, 2,'f?p=&APP_ID.:106:'||:APP_SESSION||'::::::::P106_MAQ_ID:'||(ID-1000), 3,'f?p=&APP_ID.:104:'||:APP_SESSION||'::::P106_MAQ_ID:'||(ID-10000), 4,'f?p=&APP_ID.:105:'||:APP_SESSION||'::::P106_MAQ_ID:'||(ID-100000)) as link from "#OWNER#"."V_TREE1" start with "PID" is null connect by prior "ID" = "PID" order siblings by "NAME"
But the parameter passed dont do with the report change your view to the one row with ID passed. I need to obtain the same results showed on website posted above.
I obtained success on action to redirect to other page with Form with Report to edit, but dont to show. And i want to show and the same page.
below the code that i obtained to redirect:
select case when connect_by_isleaf = 1 then 0 when level = 1 then 1 else -1 end as status, level, "NAME" as title, null as icon, "ID" as value, null as tooltip, decode(level, 1, 'f?p=&APP_ID.:102:'||:APP_SESSION||'::::P102_MAQ_ID:'||ID, 2,'f?p=&APP_ID.:103:'||:APP_SESSION||'::::P103_SRV_ID:'||(ID-1000), 3,'f?p=&APP_ID.:104:'||:APP_SESSION||'::::P104_INS_ID:'||(ID-10000), 4,'f?p=&APP_ID.:105:'||:APP_SESSION||'::::P105_SIS_ID:'||(ID-100000)) as link from "#OWNER#"."V_TREE1" start with "PID" is null connect by prior "ID" = "PID" order siblings by "NAME"
Thank you so much for your help.Muhammad,
you can add a user parameter (p_count), which get the default value value 1 for example. Then add a field (with some source of type character like desname) for your footer with a format trigger like
if :p_count=1 then
srw.set_field_char(0,'Office Copy');
elsif :p_count=2 then
srw.set_field_char(0,'Shop Copy');
else
srw.set_field_char(0,'Account Dept Copy');
end;
return true;
Or you build 3 boilerplates with format triggers like
if :p_count=1 then return true; else return false; end if; for "Office Copy" .....
In the After Report Trigger start the Report with same paramters using a higher value for p_count as parameter. If p_count=3, do nothing in the trigger.
Regards
Rainer -
JSF tree view GUI component and tree node actions
Hi,
I am new in using JSF and have a problem with my simple test application.
The application contains a tree view control with one static tree node and a separate text area. Clicking on the tree node shall fill the text area with the string 'hello'. Seems to be very simple, but it doesn't work.
What did I do?
First of all I use the Sun Java Studio Creator 2.
By double clicking on the tree node in the design window of the IDE a method called treeNode1_action() was created. I also added the String text to the session bean. treeNode1_Action() does not more than setting text='hello' ( getSessionBean().setText('hello'); ).
The jsp file contains the line
<ui:textArea binding="#{Page1.textArea}" id="textArea" style="height: 192px; left: 360px; top: 48px; position: absolute; width: 456px" text="#{SessionBean1.text}"/>, so the text of the text area is bound to the session property 'text'.
Running the application and clicking on the tree node does nothing except reloading the page (no 'hello' inside the text area).
Using the debugger showed me that the bean property text is set correctly to 'hello', also after reloading the page.
What did I do wrong?
What do I have to do to display 'hello' in the text area?
I would be glad for some good advice to solve my problem and looking forward for an answer.
Regards from germany
Matthiaswant to remove the green patch from the jsf tree componentas u said ,, it is COMPONENET so this is a pre-made creator component that u cant chnage its attributes ,,
instead u can extract Theam.jar file and change the icons ,, u i didnt do it before ,, but u may be find what u want there,
hope this will help
good luck
Mohammed -
Hi All,
Can anyone help me to implement Tree node in F4 Search help?
Thanks
E KarthikeyanSAP has provided a lot of sample programs for developing tree structures. Just go to SE38, type BCALVTREE and hit F4. You'll get different sample programs with a range of operations on trees
Go through the link,
http://www.sapdevelopment.co.uk/reporting/alv/alvtree.htm
Slowly check this code..you will get idea of how to develop tree structure.
REPORT y_hierarchies_in_tables
NO STANDARD PAGE HEADING.
PARAMETER: g_group TYPE grpname. " DEFAULT 'Z_GLAB0000'.
DATA:
g_setid TYPE setid,
g_class TYPE setclass.
DATA: lt_hier TYPE STANDARD TABLE OF sethier,
lt_val TYPE STANDARD TABLE OF setvalues.
DATA: hier LIKE sethier OCCURS 0 WITH HEADER LINE,
val LIKE setvalues OCCURS 0 WITH HEADER LINE,
setinfo LIKE setinfo OCCURS 0 WITH HEADER LINE.
DATA: zaccbas(20) TYPE c OCCURS 0 WITH HEADER LINE.
DATA: miss_val LIKE setvalues-from OCCURS 0 WITH HEADER LINE.
DATA: table_name TYPE tabname,
field_name TYPE setfld.
DATA: ambiguity_flag TYPE c.
Ambiguity check
PERFORM ambiguity_check.
Display Records
PERFORM display_records.
*& Form AMBIGUITY_CHECK
Ambiguity check
FORM ambiguity_check .
DATA: it_abaplist LIKE abaplist OCCURS 0 WITH HEADER LINE.
DATA: BEGIN OF it_ascilist OCCURS 0,
zeile(256) TYPE c,
END OF it_ascilist.
DATA: flag.
SUBMIT rgsovl00 "VIA SELECTION-SCREEN
WITH p_shrtn = g_group
WITH path = 'X'
EXPORTING LIST TO MEMORY
AND RETURN.
CALL FUNCTION 'LIST_FROM_MEMORY'
TABLES
listobject = it_abaplist
EXCEPTIONS
not_found = 1
OTHERS = 2.
CALL FUNCTION 'LIST_TO_ASCI'
TABLES
listasci = it_ascilist
listobject = it_abaplist
EXCEPTIONS
empty_list = 1
list_index_invalid = 2
OTHERS = 3 .
LOOP AT it_ascilist.
IF it_ascilist-zeile = text-001.
flag = 'X'.
ENDIF.
IF flag = 'X' AND
it_ascilist-zeile = text-002.
ambiguity_flag = 'X'.
CLEAR flag.
ENDIF.
ENDLOOP.
FREE MEMORY.
ENDFORM. " AMBIGUITY_CHECK
*& Form DISPLAY_RECORDS
Display the Records
FORM display_records .
PERFORM get_records.
PERFORM header_data.
PERFORM item_data.
ENDFORM. " DISPLAY_RECORDS
*& Form GET_RECORDS
Get all the Node values
FORM get_records .
Get the ID name for the Hierarchy
CALL FUNCTION 'G_SET_GET_ID_FROM_NAME'
EXPORTING
shortname = g_group
setclass = g_class
old_setid = g_setid
IMPORTING
new_setid = g_setid.
Get the Table and Field name for the Top Node
CALL FUNCTION 'G_SET_GET_INFO'
EXPORTING
setname = g_setid
no_set_title = 'X'
use_table_buffer = 'X'
IMPORTING
info = setinfo.
table_name = setinfo-tabname.
field_name = setinfo-fld.
Get all the Nodes for the Hierarchy
CALL FUNCTION 'G_SET_TREE_IMPORT'
EXPORTING
no_descriptions = ' '
no_rw_info = 'X'
setid = g_setid
TABLES
set_hierarchy = lt_hier
set_values = lt_val.
hier[] = lt_hier.
val[] = lt_val.
SELECT (field_name) FROM (table_name) INTO TABLE zaccbas.
LOOP AT zaccbas.
READ TABLE val WITH KEY FROM = zaccbas.
IF sy-subrc = 0.
DELETE zaccbas.
CLEAR zaccbas.
DELETE val INDEX sy-tabix.
CLEAR val.
ENDIF.
ENDLOOP.
ENDFORM. " GET_RECORDS
*& Form HEADER_DATA
Header Data
FORM header_data .
DATA: desc TYPE settext.
READ TABLE hier WITH KEY fieldname = field_name
shortname = g_group.
IF sy-subrc = 0.
desc = hier-descript.
ENDIF.
SKIP.
WRITE: 'Node :',g_group.
WRITE:75 'User name :', sy-uname.
WRITE:/ 'Description :', desc.
WRITE:75 'Date:', sy-datum.
WRITE:/ 'Table Name :' , table_name.
WRITE:75 'Time:', sy-timlo.
WRITE:/ 'Field Name :', field_name.
write:75 'Client:', SY-MANDT.
skip.
IF ambiguity_flag = 'X'.
WRITE:/ 'Ambiguity Check :'. WRITE: 'Success' COLOR 5.
ELSE.
WRITE:/ 'Ambiguity Check :'. WRITE: 'Failed' COLOR 6 .
ENDIF.
WRITE:/ sy-uline.
WRITE:/37 'Validation for Hierarchy'.
WRITE:/ sy-uline.
ENDFORM. " HEADER_DATA
*& Form ITEM_DATA
Output Report for Nodes
FORM item_data .
IF NOT zaccbas[] IS INITIAL.
WRITE:/ 'Missing Records from Hierarchy' COLOR 3.
LOOP AT zaccbas.
WRITE:/ zaccbas.
ENDLOOP.
ENDIF.
IF NOT val[] IS INITIAL.
SKIP 1.
WRITE:/ 'Additional Records in Hierarchy' COLOR 3.
LOOP AT val.
WRITE:/ val-from. ", 28 val-DESCRIPT.
ENDLOOP.
ELSEIF ZACCBAS[] IS INITIAL.
WRITE:/ 'No Missing Records Found' COLOR 3.
ENDIF.
ENDFORM. " ITEM_DATA
Thanks,
Sakthi C
*Rewards if useful* -
When-tree-node-selected not fire while navigating through keyboard(Urgent)
i am using treeview for displaying chart of account and fires the above said trigger in the form, but the trigger has no effect whilt navigating tree view with keybpard arrow keys until user explicitly select the node through mouse help me out plzz
i want that trigger also fires when user navigate and select node through keyboard or through mouse thanks
its urgentStop duplicating your threads!!!
when-tree-node-selected (Urgent)
You posted the same question 2 days ago and I've answered you, you didn't even provide an exact version of your forms.
Posting again will not change your problem.
Do not waste space on the forum. -
Post Back Tree view when tree node check changed
Hi everyone,
I have a tree view, both child and parent have check box. I want to check all the child on the parent selection.
I try "SelectedNodeChanged" but the page doesn't post back to fire my function.
I know I can use javascript to post back the page, but is there any other way to post back my page without javascript???
Thnaks in advance.Hi everyone,
I have a tree view, both child and parent have check box. I want to check all the child on the parent selection.
I try "SelectedNodeChanged" but the page doesn't post back to fire my function.
I know I can use javascript to post back the page, but is there any other way to post back my page without javascript???
Thnaks in advance.
Assuming this is a WinForm application (it looks like it may not be), the following works pretty well:
Option Strict On
Option Explicit On
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Load
With TreeView1
.CheckBoxes = True
.ShowLines = True
.ShowPlusMinus = True
.ShowRootLines = True
.ExpandAll()
End With
End Sub
' Updates all child tree nodes recursively.
Private Sub CheckAllChildNodes(ByVal treeNode As TreeNode, ByVal nodeChecked As Boolean)
Dim node As TreeNode
For Each node In treeNode.Nodes
node.Checked = nodeChecked
If node.Nodes.Count > 0 Then
' If the current node has child nodes, call the CheckAllChildsNodes method recursively.
Me.CheckAllChildNodes(node, nodeChecked)
End If
Next node
End Sub
' NOTE This code can be added to the BeforeCheck event handler instead of the AfterCheck event.
' After a tree node's Checked property is changed, all its child nodes are updated to the same value.
Private Sub node_AfterCheck(ByVal sender As Object, ByVal e As TreeViewEventArgs) Handles TreeView1.AfterCheck
' The code only executes if the user caused the checked state to change.
If e.Action <> TreeViewAction.Unknown Then
If e.Node.Nodes.Count > 0 Then
' Calls the CheckAllChildNodes method, passing in the current
' Checked value of the TreeNode whose checked state changed.
Me.CheckAllChildNodes(e.Node, e.Node.Checked)
End If
End If
End Sub
End Class
The reference for that is this MSDN document.
If you're looking for a true tri-state operation though, honestly you might want to look at some third-party controls.
I hope that helps. :)
Please call me Frank :) -
Hi guys,
I want to search a tree node by using a textbox and a button item. I have implemented all required items and regions into my page. I think that, i can do this by using dynamic action. So I wrote a small script (jquery) to use in dynamic action in button click event. It gets the value of the textbox item and tries to use this value in tree's search method. By the way I specified a static ID for my tree region. (As you can see it is TREEID). But it doesn't work. Maybe usage of the method is different.
So ,
1 : The method usage is right?
2 : Do you have any other idea about how can i do this search stuff.
$("#TREEID").tree("search", document.getElementById("P300_SEARCH_TEXT").value);
Database : Oracle11g
Apex version : 4.1
ThanksMimi gave a very good start though. I have not worked with a tree before, but those tips guided me to the documentation, and i was able to take it from there. I can't see how the documentation would be lacking for you though, i find it to be clear. However, if you don't have some experience with javascript/jquery, this will not be straightforward.
I made a new tree page, based this on EMP.
When you want to do a search, you will first need the tree object, since the search function is a function of that object. I opened Firebug and ran this in my console:
jQuery.tree.focused()This is in the docs. "This functions returns the currently focused tree instance."
If you would have more trees, you could always use
jQuery.tree.reference(needle)This functions returns a specific tree instance by an ID or contained node.
Arguments:
mixed needle
This can be either the instance ID (the ID of the container node), an ID of any contained DOM element,
an actual DOM element contained within the tree, or a jQuery extended DOM node container within the tree.>
Now you have your tree object. Let's do a search. There are 2 employees with 'LL' in their names. I want to grab those.
$.tree.focused().search("LL")This'll do "nothing". Why? Take a look at the documentation:
Searches all nodes whose titles match a given string. If async is used a request is made to the server, the response should contain the comma-separated IDs of nodes that need to be opened so that all nodes that match the search string are visible.
The search string is provided in the request. The function triggers the onsearch callback, with the nodes found as a parameter.
Arguments:
string needle
The search string.
string compare_function
Optional argument. The jQuery function to be used for comparing titles to the string - defaults to "contains".>
What is of importance here is this: The function triggers the onsearch callback
+(oh, and please note that the search is looking for a match in the TITLE of the nodes!)+
So, taking a look at onsearch:
callback.onsearch Triggered after a search is performed and results are ready.
Receives two parameters - a jQuery collection of nodes matching the search and a reference to the tree instance.
*Default is: function(NODES, TREE_OBJ) { NODES.addClass("search");* }
>
So the default action of a search is something very simple: it assigns a class to the nodes which match the search criteria.
If you would want more complex things to happen, you can simply provide another function to the tree object for the onsearch callback, and that is what Mimi meant with changing it. But you don't have to if the class-adding is sufficient.
So, running from my firebug console:
$(".search").css({"background-color":"red"})Grab all elements with class 'search', and give them a red background color. My nodes are now red for "ALLEN" and "MILLER".
It also helps to use something like firebug, have knowledge of jquery, DOM and being able to inspect it, and read docs. I did not do anything special except applying some knowledge and taking my lead from those docs. Of course, Mimi mentioned this aswell, but the docs are at *\apex_images\libraries\jquery-jstree\0.9.9a2\documentation.html*
Hope that helps you forward. -
JTree - Sometimes tree node is not selected, while clicking it using mouse
Hi,
I'm sure that it is a very rare scenario.But ,sometimes i couldnt select a tree node on mouse click.It happens very rarely and simulating the behaviour is not possible.If anyone have gone thru this,plz repond.
Thanks,
Kathirdid you try debug with a breakPoint on mouseListener->mouseClick event, and see if the selectionModel changes?
-
Useful Code of the Day: Hideable Tree Nodes
Someone posted about how they could selectively hide tree nodes, and I already had this AbstractTreeModel class (which does some things DefaultTreeModel does and some it doesn't) and a concrete subclass for TreeNode objects, so I was thinking how one could do hideable nodes. So I came up with this solution.
There's 4 classes here:
- AbstractTreeModel is the base for the concrete TreeNodeTreeModel
- TreeNodeTreeModel extends AbstractTreeModel to support TreeNodes (DefautlMutableTreeNode, etc.)
- HideableMutableTreeNode which is a DefautlMutableTreeNode subclass which has a visible field (with is/set methods, of course).
- HideableTreeModel is the hideable model which is a subclass of TreeNodeTreeModel.
A HideableMutableTreeNode can be set invisible directly, but the tree still needs to be notified to update. So it's best to use the methods in HideableTreeModel which set a node's visibility which notify the tree of changes accordingly. Methods are also provided to check a full path's visibility or ensure a node including all parent nodes are visible.
A HideableTreeModel can take any TreeNode class, it doesn't have to be all HideableMutableTreeNodes, but only HideableMutableTreeNodes can be made invisible, of course. Any other TreeNode type would just be considered visible.
Hiding nodes works basically by making the tree think there's less nodes then there are. And to do this, the node counts and child index search just works by looping thru the parent's children. This has potential perfomance drawbacks of course, since one has to loop thru the node's children to get nodes every time. This could be alleviated by not supporting non-hideable nodes changing the internal maintenance of HideableMutableTreeNode contents. But I'll leave that to whoever really needs it. It shouldn't be a problem if there are are a relatively small set of child nodes in any given parent.
Also, note that the root node in the model cannot be made invisible, cuz it'd be redundant since JTree can be set to hide the root node.
// *** HideableTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>HideableTreeModel</code> is an <code>TreeNodeTreeModel</code>
* implementation for <code>HideableMutableTreeNode</code> objects. The
* model can also take any other <code>javax.swing.tree.TreeNode</code>
* objects.
public class HideableTreeModel extends TreeNodeTreeModel {
* Creates a new <code>HideableTreeModel</code> object.
* @param root the root node
public HideableTreeModel(TreeNode root) {
super(root);
* Checks if the specified node is visible. A node can only be
* hidden if the node is an instance of <code>HideableMutableTreeNode</code>. <br />
* <br />
* Note that this only test the visibility of the specified node, not
* whether a parent node is visible. Use <code>isPathToNodeVisible(Object)</code>
* to check if the full path is visible.
* @param node the node
* @param true if the node is visible, else false
public boolean isNodeVisible(Object node) {
if(node != getRoot()) {
if(node instanceof HideableMutableTreeNode) {
return ((HideableMutableTreeNode)node).isVisible();
return true;
* Sets the specified node to be hidden. A node can only be made hidden
* if the node is an instance of <code>HideableMutableTreeNode</code>. <br />
* <br />
* Note that this method will notify the tree to reflect any changes to
* node visibility. <br />
* <br />
* Note that this will not alter the visibility of any nodes in the
* specified node's path to the root node. Use
* <code>ensurePathToNodeVisible(Object)</code> instead to make sure the
* full path down to that node is visible. <br />
* <br />
* Note that this method will notify the tree to reflect any changes to
* node visibility.
* @param node the node
* @param v true for visible, false for hidden
* @param true if the node's visibility could actually change, else false
public boolean setNodeVisible(Object node, boolean v) {
// can't hide root
if(node != getRoot()) {
if(node instanceof HideableMutableTreeNode) {
HideableMutableTreeNode n = (HideableMutableTreeNode)node;
// don't fix what ain't broke...
if(v != n.isVisible()) {
TreeNode parent = n.getParent();
if(v) {
// need to get index after showing...
n.setVisible(v);
int index = getIndexOfChild(parent, n);
super.nodeInserted(parent, n, index);
} else {
// need to get index before hiding...
int index = getIndexOfChild(parent, n);
n.setVisible(v);
super.nodeRemoved(parent, n, index);
return true;
return false;
* Checks if the specified node is visible and all nodes above it are
* visible.
* @param node the node
* @param true if the path is visible, else false
public boolean isPathToNodeVisible(Object node) {
Object[] path = getPathToRoot(node);
for(int i = 0; i < path.length; i++) {
if(!isNodeVisible(path)) {
return false;
return true;
* Sets the specified node and all nodes above it to be visible.
* Note that this method will notify the tree to reflect any changes to
* node visibility.
* @param node the node
public void ensurePathToNodeVisible(Object node) {
Object[] path = getPathToRoot(node);
for(int i = 0; i < path.length; i++) {
setNodeVisible(path[i], true);
* Returns the child of parent at index index in the parent's child array.
* @param parent the parent node
* @param index the index
* @return the child or null if no children
public Object getChild(Object parent, int index) {
if(parent instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
for(int i = 0, j = -1; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(isNodeVisible(pc)) {
j++;
if(j == index) {
return pc;
return null;
* Returns the number of children of parent.
* @param parent the parent node
* @return the child count
public int getChildCount(Object parent) {
int count = 0;
if(parent instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
for(int i = 0; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(isNodeVisible(pc)) {
count++;
return count;
* Returns the index of child in parent.
* @param parent the parent node
* @param child the child node
* @return the index of the child node in the parent
public int getIndexOfChild(Object parent, Object child) {
int index = -1;
if(parent instanceof TreeNode && child instanceof TreeNode) {
TreeNode p = (TreeNode)parent;
TreeNode c = (TreeNode)child;
if(isNodeVisible(c)) {
index = 0;
for(int i = 0; i < p.getChildCount(); i++) {
TreeNode pc = (TreeNode)p.getChildAt(i);
if(pc.equals(c)) {
return index;
if(isNodeVisible(pc)) {
index++;
return index;
* Main method for testing.
* @param args the command-line arguments
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
HideableMutableTreeNode root = new HideableMutableTreeNode("root");
root.add(new HideableMutableTreeNode("child_1"));
final HideableMutableTreeNode c2 = new HideableMutableTreeNode("child_2");
c2.setVisible(false);
final HideableMutableTreeNode c2a = new HideableMutableTreeNode("child_2_A");
c2.add(c2a);
c2.add(new HideableMutableTreeNode("child_2_B"));
root.add(c2);
HideableMutableTreeNode c3 = new HideableMutableTreeNode("child_3");
HideableMutableTreeNode cC = new HideableMutableTreeNode("child_3_C");
cC.setVisible(false);
c3.add(cC);
c3.add(new HideableMutableTreeNode("child_3_D"));
root.add(c3);
root.add(new HideableMutableTreeNode("child_4"));
root.add(new HideableMutableTreeNode("child_5"));
DefaultMutableTreeNode c6 = new DefaultMutableTreeNode("child_6");
c6.add(new DefaultMutableTreeNode("child_6_A"));
c6.add(new DefaultMutableTreeNode("child_6_B"));
root.add(c6);
final HideableTreeModel model = new HideableTreeModel(root);
JTree tree = new JTree(model);
f.getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
JButton b = new JButton("toggle");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.setNodeVisible(c2, !model.isNodeVisible(c2));
//model.ensurePathToNodeVisible(c2a);
f.getContentPane().add(b, BorderLayout.SOUTH);
f.pack();
f.setSize(300, 500);
f.show();
// *** HideableMutableTreeNode ***
import javax.swing.*;
import javax.swing.tree.*;
* <code>HideableMutableTreeNode</code> is a <code>DefaultMutableTreeNode</code>
* implementation that works with <code>HideableTreeModel</code>.
public class HideableMutableTreeNode extends DefaultMutableTreeNode {
* The node is visible flag.
public boolean visible = true;
* Creates a tree node that has no parent and no children, but which
* allows children.
public HideableMutableTreeNode() {
super();
* Creates a tree node with no parent, no children, but which allows
* children, and initializes it with the specified user object.
* @param userObject - an Object provided by the user that
* constitutes the node's data
public HideableMutableTreeNode(Object userObject) {
super(userObject);
* Creates a tree node with no parent, no children, initialized with the
* specified user object, and that allows children only if specified.
* @param userObject - an Object provided by the user that
* constitutes the node's data
* @param allowsChildren - if true, the node is allowed to have child
* nodes -- otherwise, it is always a leaf node
public HideableMutableTreeNode(Object userObject, boolean allowsChildren) {
super(userObject, allowsChildren);
* Checks if the node is visible.
* @return true if the node is visible, else false
public boolean isVisible() {
return this.visible;
* Sets if the node is visible.
* @param v true if the node is visible, else false
public void setVisible(boolean v) {
this.visible = v;
// *** TreeNodeTreeModel ***
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
* <code>TreeNodeTreeModel</code> is an <code>AbstractTreeModel</code>
* implementation for <code>javax.swing.tree.TreeNode</code> objects.
public class TreeNodeTreeModel extends AbstractTreeModel {
* Creates a new <code>TreeNodeTreeModel</code> object.
* @param root the root node
public TreeNodeTreeModel(TreeNode root) {
super();
setRoot(root);
* Returns the parent of the child node.
* @param node the child node
* @return the parent or null if root
public Object getParent(Object node) {
if(node != getRoot() && (node instanceof TreeNode)) {
return ((TreeNode)node).getParent();
return null;
* Returns the child of parent at index index in the parent's child array.
* @param parent the parent node
* @param index the index
* @return the child or null if no children
public Object getChild(Object parent, int index) {
if(parent instanceof TreeNode) {
return ((TreeNode)parent).getChildAt(index);
return null;
* Returns the number of children of parent.
* @param parent the parent node
* @return the child count
public int getChildCount(Object parent) {
if(parent instanceof TreeNode) {
return ((TreeNode)parent).getChildCount();
return 0;
* Returns the index of child in parent.
* @param parent the parent node
* @param child the child node
* @return the index of the child node in the parent
public int getIndexOfChild(Object parent, Object child) {
if(parent instanceof TreeNode && child instanceof TreeNode) {
return ((TreeNode)parent).getIndex((TreeNode)child);
return -1;
* Returns true if node is a leaf.
* @param node the node
* @return true if the node is a leaf
public boolean isLeaf(Object node) {
if(node instanceof TreeNode) {
return ((TreeNode)node).isLeaf();
return true;
* Main method for testing.
* @param args the command-line arguments
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
root.add(new DefaultMutableTreeNode("child_1"));
DefaultMutableTreeNode c2 = new DefaultMutableTreeNode("child_2");
c2.add(new DefaultMutableTreeNode("child_2_A"));
c2.add(new DefaultMutableTreeNode("child_2_B"));
root.add(c2);
root.add(new DefaultMutableTreeNode("child_3"));
root.add(new DefaultMutableTreeNode("child_4"));
JTree tree = new JTree(new TreeNodeTreeModel(root));
f.getContentPane().add(new JScrollPane(tree));
f.pack();
f.setSize(300, 500);
f.show();
// *** AbstractTreeModel ***
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public abstract class AbstractTreeModel implements TreeModel {
* The list of tree model listeners.
private Vector modelListeners = new Vector();
* The root object of the tree.
private Object root = null;
* Basic no-op constructor.
public AbstractTreeModel() {
* Gets the root object of the tree.
* @return the root object
public Object getRoot() {
return this.root;
* Sets the root object of the tree.
* @param r the root object
protected void setRoot(Object r) {
this.root = r;
* Gets the path to the root node for the specified object.
* @param node the root node
* @return the path to the object or <CODE>null</CODE>
public Object[] getPathToRoot(Object node) {
return getPathToRoot(node, 0);
* Gets the path to the root node for the specified object.
* @param node the root node
* @param i the current index
* @return the path to the object or <CODE>null</CODE>
private Object[] getPathToRoot(Object node, int i) {
Object anode[];
if(node == null) {
if(i == 0) {
return null;
anode = new Object[i];
} else {
i++;
if(node == getRoot()) {
anode = new Object[i];
} else {
anode = getPathToRoot(getParent(node), i);
anode[anode.length - i] = node;
return anode;
* Gets the parent object of the specified object. This method is not
* part of the <code>javax.swing.tree.TreeModel</code> interface, but is
* required to support the <code>getPathToRoot(Object)</code> method,
* which is widely used in this class. Therefore, it is important to
* correctly implement this method.
* @param obj the object
* @parma the parent object or null if no parent or invalid object
protected abstract Object getParent(Object obj);
* Adds a listener for the <CODE>TreeModelEvent</CODE> posted after the
* tree changes.
* @param l the tree model listener
public void addTreeModelListener(TreeModelListener l) {
modelListeners.addElement(l);
* Removes a listener previously added with addTreeModelListener().
* @param l the tree model listener
public void removeTreeModelListener(TreeModelListener l) {
modelListeners.removeElement(l);
* Forces the tree to reload. This is useful when many changes occur
* under the root node in the tree structure.
* <b>NOTE:</b> This will cause the tree to be collapsed. To maintain
* the expanded nodes, see the <code>getExpandedPaths(JTree)</code>
* and <code>expandPaths(JTree, ArrayList)</code> methods.
* @see #getExpandedPaths(JTree)
* @see #expandPaths(JTree, ArrayList)
public void reload() {
reload(getRoot());
* Forces the tree to repaint. This is useful when many changes occur
* under a specific node in the tree structure.
* <b>NOTE:</b> This will cause the tree to be collapsed below the
* updated node.
* @param node the node that changed
public void reload(Object node) {
if(node != null) {
TreePath tp = new TreePath(getPathToRoot(node));
fireTreeStructureChanged(new TreeModelEvent(this, tp));
* Messaged when the user has altered the value for the item identified
* by <CODE>path</CODE> to <CODE>newValue</CODE>.
* @param path the path to the changed object
* @param newValue the new value
public void valueForPathChanged(TreePath path, Object newValue) {
nodeChanged(path.getLastPathComponent());
* Notifies the tree that nodes were inserted. The index is looked up
* automatically.
* @param node the parent node
* @param child the inserted child node
public void nodeInserted(Object node, Object child) {
nodeInserted(node, child, -1);
* Notifies the tree that nodes were inserted.
* @param node the parent node
* @param child the inserted child node
* @param index the index of the child
public void nodeInserted(Object node, Object child, int index) {
if(index < 0) {
index = getIndexOfChild(node, child);
if(node != null && child != null && index >= 0) {
TreePath tp = new TreePath(getPathToRoot(node));
int[] ai = { index };
Object[] ac = { child };
fireTreeNodesInserted(new TreeModelEvent(this, tp, ai, ac));
* Notifies the tree that nodes were removed. The index is required
* since by this point, the object will no longer be in the tree.
* @param node the parent node
* @param child the removed child node
* @param index the index of the child
public void nodeRemoved(Object node, Object child, int index) {
if(node != null && child != null && index >= 0) {
TreePath tp = new TreePath(getPathToRoot(node));
int[] ai = { index };
Object[] ac = { child };
fireTreeNodesRemoved(new TreeModelEvent(this, tp, ai, ac));
* Notifies the tree that a node was changed.
* @param node the changed node
public void nodeChanged(Object node) {
if(node != null) {
TreePath tp = new TreePath(getPathToRoot(node));
fireTreeNodesChanged(new TreeModelEvent(this, tp, null, null));
* Fires "tree nodes changed" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesChanged(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesChanged(event);
* Fires "tree nodes inserted" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesInserted(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesInserted(event);
* Fires "tree nodes removed" events to all listeners.
* @param event the tree model event
protected void fireTreeNodesRemoved(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeNodesRemoved(event);
* Fires "tree structure changed" events to all listeners.
* @param event the tree model event
protected void fireTreeStructureChanged(TreeModelEvent event) {
for(int i = 0; i < modelListeners.size(); i++) {
((TreeModelListener)modelListeners.elementAt(i)).treeStructureChanged(event);
* Records the list of currently expanded paths in the specified tree.
* This method is meant to be called before calling the
* <code>reload()</code> methods to allow the tree to store the paths.
* @param tree the tree
* @param pathlist the list of expanded paths
public ArrayList getExpandedPaths(JTree tree) {
ArrayList expandedPaths = new ArrayList();
addExpandedPaths(tree, tree.getPathForRow(0), expandedPaths);
return expandedPaths;
* Adds the expanded descendants of the specifed path in the specified
* tree to the internal expanded list.
* @param tree the tree
* @param path the path
* @param pathlist the list of expanded paths
private void addExpandedPaths(JTree tree, TreePath path, ArrayList pathlist) {
Enumeration enum = tree.getExpandedDescendants(path);
while(enum.hasMoreElements()) {
TreePath tp = (TreePath)enum.nextElement();
pathlist.add(tp);
addExpandedPaths(tree, tp, pathlist);
* Re-expands the expanded paths in the specified tree. This method is
* meant to be called before calling the <code>reload()</code> methods
* to allow the tree to store the paths.
* @param tree the tree
* @param pathlist the list of expanded paths
public void expandPaths(JTree tree, ArrayList pathlist) {
for(int i = 0; i < pathlist.size(); i++) {
tree.expandPath((TreePath)pathlist.get(i));Hey
I'm not trying to show anyone up here, but having just built a tree model for displaying an XML document in a tree, I thought this seemed like a neat exercise.
I implemented this very differently from the @OP. I only have one class, HiddenNodeTreeModel. All the hidden node data is stored in the model itself in my class. The advantage of what I've created is it will work with any TreeModel. The disadvantage is that I think it's not going to be very scalable - the additional computing to get the number of child nodes and to adjust indexes is heavy. So if you need a scalable solution definitely don't use this.
Anyway here you go
HiddenNodeTreeModel.java
======================
package tjacobs.ui.tree;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import tjacobs.ui.WindowUtilities;
public class HiddenNodeTreeModel implements TreeModel {
TreeModel mModel;
ArrayList<Object> mHidden = new ArrayList<Object>();
public HiddenNodeTreeModel (TreeModel model) {
mModel = model;
public void addTreeModelListener(TreeModelListener arg0) {
mModel.addTreeModelListener(arg0);
private ArrayList<Integer> getHiddenChildren(Object parent) {
ArrayList<Integer> spots = new ArrayList<Integer>();
Iterator _i = mHidden.iterator();
while (_i.hasNext()) {
Object hidden = _i.next();
int idx = mModel.getIndexOfChild(parent, hidden);
if (idx != -1) {
spots.add(idx);
return spots;
public Object getChild(Object arg0, int index) {
ArrayList<Integer> spots = getHiddenChildren(arg0);
Collections.sort(spots);
Iterator<Integer> _i = spots.iterator();
while (_i.hasNext()) {
int num = _i.next();
if (num <= index) {
index++;
return mModel.getChild(arg0, index);
public int getChildCount(Object arg0) {
ArrayList list = getHiddenChildren(arg0);
System.out.println("size = " + list.size());
return mModel.getChildCount(arg0) - list.size();
public int getIndexOfChild(Object arg0, Object arg1) {
int index = mModel.getIndexOfChild(arg0, arg1);
ArrayList<Integer> spots = getHiddenChildren(arg0);
Collections.sort(spots);
Iterator<Integer> _i = spots.iterator();
int toSub = 0;
while (_i.hasNext()) {
int num = _i.next();
if (num <= index) {
toSub++;
return index - toSub;
public Object getRoot() {
// TODO Auto-generated method stub
return mModel.getRoot();
public boolean isLeaf(Object arg0) {
// TODO Auto-generated method stub
return mModel.isLeaf(arg0);
public void removeTreeModelListener(TreeModelListener arg0) {
mModel.removeTreeModelListener(arg0);
public void valueForPathChanged(TreePath arg0, Object arg1) {
mModel.valueForPathChanged(arg0, arg1);
public void hideNode(Object node) {
if (node instanceof TreePath) {
node = ((TreePath)node).getLastPathComponent();
mHidden.add(node);
public void showNode(Object node) {
mHidden.remove(node);
public void showAll() {
mHidden.clear();
* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub
DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
DefaultMutableTreeNode D = new DefaultMutableTreeNode("D");
DefaultMutableTreeNode E = new DefaultMutableTreeNode("E");
DefaultMutableTreeNode F = new DefaultMutableTreeNode("F");
A.add(B);
B.add(C);
B.add(D);
B.add(E);
E.add(F);
DefaultTreeModel model = new DefaultTreeModel(A);
final HiddenNodeTreeModel hmodel = new HiddenNodeTreeModel(model);
final JTree tree = new JTree(hmodel);
JFrame jf = new JFrame("HiddenNodeTreeModel Test");
jf.add(tree);
JMenuBar bar = new JMenuBar();
jf.setJMenuBar(bar);
JMenu menu = new JMenu("Options");
bar.add(menu);
final JMenuItem hide = new JMenuItem("Hide");
final JMenuItem show = new JMenuItem("ShowAll");
menu.add(hide);
menu.add(show);
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == hide) {
hmodel.hideNode(tree.getSelectionPath());
tree.updateUI();
else {
hmodel.showAll();
tree.updateUI();
hide.addActionListener(al);
show.addActionListener(al);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setBounds(100,100,100,100);
jf.setVisible(true);
} -
Read Selected Tree Node value. Jdeveloper Jdeveloper 11.1.2.1.0 11.1.2.1.0
Version: Jdeveloper 11.1.2.1.0
how to get programmatically tree node value.
i have tried but cann't read value from selected node.
please help me.
here is my application creation steps:
1. New Application
2. Fusion Web Application (ADF) Template
3. Create View Object VOTreeMst
Query:
Select Department_Name,Department_Id
From Departments
4. Create View Object VOTreeChd
Query:
Select Last_Name,Employee_Id,Department_Id
From Employees
5. Create View Link VLTreeMstChd
VOTreeMst.DepartmentId=VOTreeChd.DepartmentId
And Add to Application Module
6. Create page page1 in ViewController
New-->Web Tier-->JSF/Facelets-->Page
Selected Document Type JSP XML
7. Drag VOTreeMst1 From Data Controls into page1
and select Tree-->ADF Tree
8. ADD java Code into selection Listener
public void nodeSelect(SelectionEvent selectionEvent) {
//original selection listener set by ADF
String adfSelectionListener = "#{bindings.VOTreeMst1.treeModel.makeCurrent}";
//make sure the default selection listener functionality is preserved.
//you don't need to do this for multi select trees as the ADF binding
//only supports single current row selection
/* START PRESERVER DEFAULT ADF SELECT BEHAVIOR */
FacesContext fctx = FacesContext.getCurrentInstance();
Application application = fctx.getApplication();
ELContext elCtx = fctx.getELContext();
ExpressionFactory exprFactory = application.getExpressionFactory();
MethodExpression me = null;
me = exprFactory.createMethodExpression(elCtx, adfSelectionListener, Object.class,
new Class[] { SelectionEvent.class });
me.invoke(elCtx, new Object[] { selectionEvent });
/* END PRESERVER DEFAULT ADF SELECT BEHAVIOR */
RichTree tree = (RichTree)selectionEvent.getSource();
TreeModel model = (TreeModel)tree.getValue();
//get selected nodes
RowKeySet rowKeySet = selectionEvent.getAddedSet();
Iterator rksIterator = rowKeySet.iterator();
//for single select configurations, thi sonly is called once
while (rksIterator.hasNext()) {
List key = (List)rksIterator.next();
JUCtrlHierBinding treeBinding = null;
CollectionModel collectionModel = (CollectionModel)tree.getValue();
treeBinding = (JUCtrlHierBinding)collectionModel.getWrappedData();
JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);
Row rw = nodeBinding.getRow();
//print first row attribute. Note that in a tree you have to determine the node
//type if you want to select node attributes by name and not index
String rowType = rw.getStructureDef().getDefName();
if(rowType.equalsIgnoreCase("VOTreeMst")){
System.out.println("This row is a department: " + rw.getAttribute("DepartmentId"));
else if(rowType.equalsIgnoreCase("VOTreeChd")){
System.out.println("This row is an employee: " + rw.getAttribute("EmployeeId"));
else{
System.out.println("Huh ????");
// ... do more usefuls stuff here
9. when i click on first node it is working but i click on second node it is not working
error message::
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase INVOKE_APPLICATION 5
javax.el.ELException: java.lang.NullPointerException
at com.sun.el.parser.AstValue.invoke(Unknown Source)
at com.sun.el.MethodExpressionImpl.invoke(Unknown Source)
at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodExpression(UIXComponentBase.java:1589)
at org.apache.myfaces.trinidad.component.UIXTree.broadcast(UIXTree.java:237)
<RegistrationConfigurator> <handleError> ADF_FACES-60096:Server Exception during PPR, #1
javax.el.ELException: java.lang.NullPointerException
I have also tried using following code but same problem
public void onTreeSelect(SelectionEvent selectionEvent) {
//original selection listener set by ADF
String adfSelectionListener = "#{bindings.VOTreeMst1.treeModel.makeCurrent}";
//make sure the default selection listener functionality is preserved.
//you don't need to do this for multi select trees as the ADF binding
//only supports single current row selection
/* START PRESERVER DEFAULT ADF SELECT BEHAVIOR */
FacesContext fctx = FacesContext.getCurrentInstance();
Application application = fctx.getApplication();
ELContext elCtx = fctx.getELContext();
ExpressionFactory exprFactory = application.getExpressionFactory();
MethodExpression me = null;
me = exprFactory.createMethodExpression(elCtx, adfSelectionListener, Object.class,
new Class[] { SelectionEvent.class });
me.invoke(elCtx, new Object[] { selectionEvent });
/* END PRESERVER DEFAULT ADF SELECT BEHAVIOR */
RichTree tree = (RichTree)selectionEvent.getSource();
TreeModel model = (TreeModel)tree.getValue();
//get selected nodes
RowKeySet rowKeySet = selectionEvent.getAddedSet();
Iterator rksIterator = rowKeySet.iterator();
//for single select configurations, thi sonly is called once
while (rksIterator.hasNext()) {
List key = (List)rksIterator.next();
JUCtrlHierBinding treeBinding = null;
treeBinding = (JUCtrlHierBinding)((CollectionModel)tree.getValue()).getWrappedData();
JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);
Row rw = nodeBinding.getRow();
//print first row attribute. Note that in a tree you have to determine the node
//type if you want to select node attributes by name and not index
System.out.println("row: " + rw.getAttribute(0));
But
If i create .jspx page From
Web Tier->Jsp->page Then it is working fine
when i create .jspx page From
Web Tier->JSF\Facelets->page Then it is not working
i need to get value from "Web Tier->JSF\Facelets->page"
is there any help please?You should try Franks generic selectionListener http://www.oracle.com/technetwork/developer-tools/adf/learnmore/25-generic-tree-selection-listener-169164.pdf. For help on hoe to get the selected tree node data check http://www.oracle.com/technetwork/developer-tools/adf/learnmore/26-get-selected-tree-node-data-169165.pdf
Timo -
Help with building a JTree using tree node and node renderers
Hi,
I am having a few problems with JTree's. basically I want to build JTree from a web spider. The webspide searches a website checking links and stores the current url that is being processed as a string in the variable msg. I wan to use this variable to build a JTree in a new class and then add it to my GUI. I have created a tree node class and a renderer node class, these classes are built fine. can someone point me in the direction for actually using these to build my tree in a seperate class and then displaying it in a GUI class?
*nodeRenderer.java
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.net.*;
public class nodeRenderer extends DefaultTreeCellRenderer
implements TreeCellRenderer
public static Icon icon= null;
public nodeRenderer() {
icon = new ImageIcon(getClass().getResource("icon.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
treeNode node = (treeNode)(((DefaultMutableTreeNode)value).getUserObject());
if(icon != null) // set a custom icon
setOpenIcon(icon);
setClosedIcon(icon);
setLeafIcon(icon);
return this;
*treeNode.java
*this is the class to represent a node
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import java.net.*;
* Class used to hold information about a web site that has
* been searched by the spider class
public class treeNode
*Url from the WebSpiderController Class
*that is currently being processed
public String msg;
treeNode(String urlText)
msg = urlText;
String getUrlText()
return msg;
//gui.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree searchTree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread=null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void URLError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
errorText.append(addMsg);
current.setText("Currently Processing: "+ addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
*this method will update the currently
*processing field on the GUI
class CurrentlyProcessing implements Runnable
public String msg;
public void run()
current.setText("Currently Processing: " + msg );
//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.tree.*;
import javax.swing.*;
*this class implements the spider.
public class WebSpider extends HTMLEditorKit
*make a collection of the URL's
protected Collection urlErrors = new ArrayList(3);
protected Collection urlsWaiting = new ArrayList(3);
protected Collection urlsProcessed = new ArrayList(3);
//report URL's to this class
protected gui report;
*this flag will indicate whether the process
*is to be cancelled
protected boolean cancel = false;
*The constructor
*report the urls to the wui class
public WebSpider(gui report)
this.report = report;
*get the urls from the above declared
*collections
public Collection getUrlErrors()
return urlErrors;
public Collection getUrlsWaiting()
return urlsWaiting;
public Collection getUrlsProcessed()
return urlsProcessed;
* Clear all of the collections.
public void clear()
getUrlErrors().clear();
getUrlsWaiting().clear();
getUrlsProcessed().clear();
*Set a flag that will cause the begin
*method to return before it is done.
public void cancel()
cancel = true;
*add the entered url for porcessing
public void addURL(URL url)
if (getUrlsWaiting().contains(url))
return;
if (getUrlErrors().contains(url))
return;
if (getUrlsProcessed().contains(url))
return;
/*WRITE TO LOG FILE*/
log("Adding to workload: " + url );
getUrlsWaiting().add(url);
*process a url
public void processURL(URL url)
try
/*WRITE TO LOGFILE*/
log("Processing: " + url );
// get the URL's contents
URLConnection connection = url.openConnection();
if ((connection.getContentType()!=null) &&
!connection.getContentType().toLowerCase().startsWith("text/"))
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Not processing because content type is: " +
connection.getContentType() );
return;
// read the URL
InputStream is = connection.getInputStream();
Reader r = new InputStreamReader(is);
// parse the URL
HTMLEditorKit.Parser parse = new HTMLParse().getParser();
parse.parse(r,new Parser(url),true);
catch (IOException e)
getUrlsWaiting().remove(url);
getUrlErrors().add(url);
log("Error: " + url );
report.URLError(url);
return;
// mark URL as complete
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Complete: " + url );
*start the spider
public void run()
cancel = false;
while (!getUrlsWaiting().isEmpty() && !cancel)
Object list[] = getUrlsWaiting().toArray();
for (int i=0;(i<list.length)&&!cancel;i++)
processURL((URL)list);
* A HTML parser callback used by this class to detect links
protected class Parser extends HTMLEditorKit.ParserCallback
protected URL urlInput;
public Parser(URL urlInput)
this.urlInput = urlInput;
public void handleSimpleTag(HTML.Tag t,MutableAttributeSet a,int pos)
String href = (String)a.getAttribute(HTML.Attribute.HREF);
if((href==null) && (t==HTML.Tag.FRAME))
href = (String)a.getAttribute(HTML.Attribute.SRC);
if (href==null)
return;
int i = href.indexOf('#');
if (i!=-1)
href = href.substring(0,i);
if (href.toLowerCase().startsWith("mailto:"))
report.emailFound(href);
return;
handleLink(urlInput,href);
public void handleStartTag(HTML.Tag t,MutableAttributeSet a,int pos)
handleSimpleTag(t,a,pos); // handle the same way
protected void handleLink(URL urlInput,String str)
try
URL url = new URL(urlInput,str);
if (report.urlFound(urlInput,url))
addURL(url);
catch (MalformedURLException e)
log("Found malformed URL: " + str);
*log the information of the spider
public void log(String entry)
System.out.println( (new Date()) + ":" + entry );
I have a seperate class for parseing the HTML. Any help would be greatly appreciated
mrvHi Sorry to be a pain again,
I have re worked the gui class so it looks like this now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public String msgInfo;
public String brokenUrl;
public String goodUrl;
public String deadUrl;
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//JTree
// NEW CODE
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
treeText.add(tree);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree tree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
//new line of code
treeText.addObject(msgInfo);
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread = null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
brokenUrl = url.toString();
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is returned if there is no link
*on a web page, e.g. there us a dead end
public void urlNotFound(URL urlInput)
deadEnd dEnd = new deadEnd();
dEnd.dEMsg = "No links on "+urlInput+"\n";
deadUrl = urlInput.toString();
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
goodUrl = url.toString();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void urlError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
current.setText("Currently Processing: "+ addMsg);
errorText.append(addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
class deadEnd implements Runnable
public String dEMsg;
public void run()
errorText.append(dEMsg);
*this method will update the currently
*processing field on the GUI
public class CurrentlyProcessing implements Runnable
public String msg;
//new line
public String msgInfo = msg;
public void run()
current.setText("Currently Processing: " + msg );
* NEW CODE
* NEED THIS CODE SOMEWHERE
* treeText.addObject(msgInfo);
public DefaultMutableTreeNode addObject(Object child)
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null)
parentNode = rootNode;
else
parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child)
return addObject(parent, child, false);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child,boolean shouldBeVisible)
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
if (parent == null)
parent = rootNode;
treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
if (shouldBeVisible)
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
public class MyTreeModelListener implements TreeModelListener
public void treeNodesChanged (TreeModelEvent e)
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
try
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
catch (NullPointerException exc)
public void treeNodesInserted(TreeModelEvent e)
public void treeStructureChanged(TreeModelEvent e)
public void treeNodesRemoved(TreeModelEvent e)
I beleive that this line of code is required:
treeText.addObject(msgInfo);
I have placed it where the action events start the spider, but i keep getting this error:
cannot resolve symbol
symbol : method addObject (java.lang.String)
location: class javax.swing.JTextArea
treeText.addObject(msgInfo);
Also the jtree is not showing the window that I want it to and I am not too sure why. could you have a look to see why? i think it needs a fresh pair of eyes.
Many thanks
MrV -
How to hide a tree node from the GUI but still keep it in the tree model?
Hi, All
I used a JTree in my project in which I have a DefaultTreeModel to store all the tree structure and a JTree show it on the screen. But for some reason, I want to hide some of the nodes from the user, but I don't want to remove them from the tree model because later on I still need to use them.
I searched on the web, some people suggested method to hide the root node, but that's not appliable to my project because I want to hide some non-root nodes; Some people also suggested to collapse the parent node when there are child to hide, it is not appliable to me either, because there still some other childnodes (sibling of the node to hide) I want to show.
How can I hide some of the tree node from the user? Thanks for any information.
LindaHere's an example using a derivation of DefaultTreeModel that shows (or does not show) two types of Sneech (appologies to the good Dr Zeus) by overiding two methods on the model.
Now, there are many things wrong with this example (using instanceof, for example), but it's pretty tight and shows one way of doing what you want.
Note: to make it useful, you''d have to change the implementation of setShowStarBelliedSneeches() to do something more sophisticated than simply firing a structure change event on the root node. You'd want to find all the star bellied sneech nodes and call fireTreeNodesRemoved(). That way the tree would stay expanded rather than collapse as it does now.
import javax.swing.JTree;
import javax.swing.JScrollPane;
import javax.swing.JOptionPane;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
class FilteredTree
private class PlainBelliedSneech {
public String toString() { return "Plain Bellied Sneech"; }
private class StarBelliedSneech {
public String toString() { return "Star Bellied Sneech"; }
private class FilteredTreeModel
extends DefaultTreeModel
private boolean mShowStarBelliedSneeches= true;
private DefaultMutableTreeNode mRoot;
FilteredTreeModel(DefaultMutableTreeNode root)
super(root);
mRoot= root;
public Object getChild(Object parent, int index)
DefaultMutableTreeNode node=
(DefaultMutableTreeNode) parent;
if (mShowStarBelliedSneeches)
return node.getChildAt(index);
int pos= 0;
for (int i= 0, cnt= 0; i< node.getChildCount(); i++) {
if (((DefaultMutableTreeNode) node.getChildAt(i)).getUserObject()
instanceof PlainBelliedSneech)
if (cnt++ == index) {
pos= i;
break;
return node.getChildAt(pos);
public int getChildCount(Object parent)
DefaultMutableTreeNode node=
(DefaultMutableTreeNode) parent;
if (mShowStarBelliedSneeches)
return node.getChildCount();
int childCount= 0;
Enumeration children= node.children();
while (children.hasMoreElements()) {
if (((DefaultMutableTreeNode) children.nextElement()).getUserObject()
instanceof PlainBelliedSneech)
childCount++;
return childCount;
public boolean getShowStarBelliedSneeches() {
return mShowStarBelliedSneeches;
public void setShowStarBelliedSneeches(boolean showStarBelliedSneeches)
if (showStarBelliedSneeches != mShowStarBelliedSneeches) {
mShowStarBelliedSneeches= showStarBelliedSneeches;
Object[] path= { mRoot };
int[] childIndices= new int[root.getChildCount()];
Object[] children= new Object[root.getChildCount()];
for (int i= 0; i< root.getChildCount(); i++) {
childIndices= i;
children[i]= root.getChildAt(i);
fireTreeStructureChanged(this, path, childIndices, children);
private FilteredTree()
final DefaultMutableTreeNode root= new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode parent;
DefaultMutableTreeNode child;
for (int i= 0; i< 2; i++) {
parent= new DefaultMutableTreeNode(new PlainBelliedSneech());
root.add(parent);
for (int j= 0; j< 2; j++) {
child= new DefaultMutableTreeNode(new StarBelliedSneech());
parent.add(child);
for (int k= 0; k< 2; k++)
child.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
for (int j= 0; j< 2; j++)
parent.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
parent= new DefaultMutableTreeNode(new StarBelliedSneech());
root.add(parent);
for (int j= 0; j< 2; j++) {
child= new DefaultMutableTreeNode(new PlainBelliedSneech());
parent.add(child);
for (int k= 0; k< 2; k++)
child.add(new DefaultMutableTreeNode(new StarBelliedSneech()));
for (int j= 0; j< 2; j++)
parent.add(new DefaultMutableTreeNode(new StarBelliedSneech()));
final FilteredTreeModel model= new FilteredTreeModel(root);
JTree tree= new JTree(model);
tree.setShowsRootHandles(true);
tree.putClientProperty("JTree.lineStyle", "Angled");
tree.setRootVisible(false);
JScrollPane sp= new JScrollPane(tree);
sp.setPreferredSize(new Dimension(200,400));
final JCheckBox check= new JCheckBox("Show Star Bellied Sneeches");
check.setSelected(model.getShowStarBelliedSneeches());
check.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
model.setShowStarBelliedSneeches(check.isSelected());
JPanel panel= new JPanel(new BorderLayout());
panel.add(check, BorderLayout.NORTH);
panel.add(sp, BorderLayout.CENTER);
JOptionPane.showOptionDialog(
null, panel, "Sneeches on Beeches",
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null, new String[0], null
System.exit(0);
public static void main(String[] argv) {
new FilteredTree();
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How do I submit a computer for repairs/use my warranty?
Okay, I have a HP Pavillion 500-a60 Desktop PC and this thing has given me trouble since I've first gotten it! The frist problem was that it's hardware system crashed within the frist 3 weeks of having it THEN when I got a new one it wouldn't conntec
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I'm struggling with the Findlstn function in Labview. It's returning "Labview: Configuration Token not found", and "NI-488: Table Error". I'm guessing the format of my address list input isn't correct - I'm using a 1-D array of word - but can't fin
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HT203483 My Wifi is Glictching on and off
Wifi is glitching on and off, it i s the ipods problem, the wifi is fine on all other devices
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Considerations on migrating from TDM PRI's to SIP Trunking?
Hello, We are planning a migration from traditional TDM PRI's to SIP trunking for inbound toll-free and outbound LD telephone traffic. Currently, we have 7 x PRI's connected to a 3945 router feeding our CUCM 8.6 system. This works fine. We are planni
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Installation of Photoshop CS5 extended trial crashes
I am running Windows XP 32 bit and have downloaded the trial version of photoshop cs5 extended from the Adobe website, Installation runs normally for 18% and the machine reboots I have searched for a solution to this problem without success. Any help