Populating Tree control

Hi there
I have tried to populate a hierarchical tree with a simple Record
Group based on a database table. Unfortunately there is no data
shown during runtime. I assume the table definition is not
correct.
Since I have not found any information about a table definition I
would kindly ask you to provide me with that information.
Thank you
George
null

Hello,
I've got the same problem (ie:the data from my record group doesn't show in the tree). I discover that I should populate my record group (with the built in POPULATE_GROUP) before I populate the tree (ie ftree.populate_tree). It should work fine after that. Your select should contains, in order :
initial state, a number : 0 => normal, -1 => collapsed, 1 => expanded.
node tree depth, a number : the level in the tree. I use the number 1, 2, 3 (well, I've got only three level in my trees).
Label for the node, a varchar2.
Icon for the node, a varchar2. With Windows, you should set the reg key UI_ICON and don't put the .ico in the name. If you use it with the Web, it's a another key in the registry and should be a .gif file.
And last but not least, the data associated with the node.
You should'nt have another row selected in your SELECT or it will generated an error at runtime.
HTH
Nicolas

Similar Messages

Not able to get the database data into the Tree Control

Hi Everybody,
I have to populate the tree control with nodes and items, which is to be populated from the database, and the tree control is dynamic. I mean, there is a toolbar, whenever a pushbutton is clicked, depending on that the tree contents has to be changed.
If anybody had worked with CL_GUI_COLUMN_TREE control to get the data from database, depending upon the pushbutton selected in Toolbar, please paste the seudocode for it.
Regards,
Abdul,
Intelligroup.
P.S: Helpful answers will be rewarded.

have you seen this demo program
SAPCOLUMN_TREE_CONTROL_DEMO
Regards
Raja

Array of Tree Control

Hi,
I have a tree control which I am using to display a test sequence. I would like to put the tree controls in an array to display multiple (different) sequences. I am having problems populating the controls. When I get the reference, it populates all the controls in the array, rather than just one element.
Is there a way to populate just a single element in the array?
Thanks
John
Solved!
Go to Solution.

The only thing that can be different in an array is the value of the elements. All elements will share the same properties. In the case of a tree control the value is the item that's selected. The actual items is a property and hence every element would display the same items. If you need to have multiple tree controls then you would need to use a cluster, or just have multiple tree controls.

Populate flex tree control on demand using HTTPService (Flex 3)

First, I am sorry if the same post is already posted here but after spending 30 minutes or may be more I could not find the solution.
By the way I have two problems. 1.) I am new to flex which I know if my own problem and soon I will handle it.
2.) This is major problem for me. I have to populate Tree control from database and I used HTTPService to get the data from database.
I created a object of HTTPService and on load of Tree control I am calling a function which calls the HTTP URL and returns me the first level of node for my Tree.
When I click on any node a function is called again using HTTPService and result is appended to the currently selected node. The same goes until n level and it works fine. I was happy with my results. I am stuck in new problem. The problem is if the tree is already populated on my browser and I make some add/update/delete any node or child node, the flex doesn't make a call to HTTP URL and I am not getting updated data.
The mxml code is below (this code has some extra things too).
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical" backgroundGradientAlphas="[1.0, 1.0]"
backgroundGradientColors="[#000000, #868686]" >
<mx:Script>
<![CDATA[
 import mx.utils.StringUtil;
 import mx.rpc.http.HTTPService;
 import mx.events.ListEvent;
 import mx.binding.utils.BindingUtils;
 import mx.controls.Alert;
 import mx.rpc.events.FaultEvent;
 import mx.collections.XMLListCollection;
 import mx.utils.ObjectProxy;
 import mx.collections.ArrayCollection;
 import mx.rpc.events.ResultEvent;
 import mx.utils.ArrayUtil;
 [Bindable]
 public var datalist:XMLListCollection = new XMLListCollection();
 [Bindable]
 public var xmlFromDatabase:HTTPService=new HTTPService();
 [Bindable]
 private var xmlForChildren:HTTPService;
 private function resultHandler( event:ResultEvent ):void
 var x:XML = event.result as XML;
 var xl:XMLList = XMLList( x );
 private function faultHandler( event:FaultEvent ):void
 Alert.show(event.message.toString());
 private function display():void
 var params:Object = {};
 params["parent"] = "0";
 xmlFromDatabase.url = "http://localhost:8080/GrailsFlex/department/tree";
 xmlFromDatabase.method = "GET";
 xmlFromDatabase.resultFormat = "e4x";
 xmlFromDatabase.useProxy = false;
 xmlFromDatabase.send(params);
 xmlFromDatabase.addEventListener(ResultEvent.RESULT,displyTree,false,0,false);
 private function displyTree(event:ResultEvent):void
 XMLtree1.dataProvider = event.result;
 XMLtree1.labelField = "@name";
 private function getChilds(event:ListEvent):void
 try
 var xmlTree:Tree = event.currentTarget as Tree;
 var node:XML = xmlTree.selectedItem as XML
 var params:Object = {};
 params["parent"] = node.@id;
 xmlForChildren = new HTTPService();
 xmlForChildren.url = "http://localhost:8080/GrailsFlex/department/tree";
 xmlForChildren.method = "GET";
 xmlForChildren.resultFormat = "e4x";
 xmlForChildren.useProxy = false;
 xmlForChildren.send(params);
 xmlForChildren.addEventListener(ResultEvent.RESULT,appendChild,false,0,false);
 xmlForChildren.addEventListener(ListEvent.ITEM_CLICK,getChilds,false,0,false);
 catch (E:Error)
 Alert.show("getChilds Error:-- " + E.message);
 private function deleteTreeNode(xmlItem:XML):void
 var xmlParent:XML = XML(xmlItem).parent();
 if (xmlParent.@parent == null || StringUtil.trim(xmlParent.@parent) == "")
 xmlParent.@parent = "0";
 if (xmlParent.@parent != "0")
 //Recursive call until I get reach to children of root node
 deleteTreeNode(xmlParent);
 else
 // Now I am at root.
 var xmlRoot:XML = XML(xmlParent).parent();
 var bActualRoot:Boolean = false;
 if (xmlRoot == null)
 xmlRoot = xmlParent;
 bActualRoot = true;
 if (bActualRoot)
 if (xmlRoot.@parent == "0")
 try
 for each (var xl:XML in xmlParent.children())
 if (xl.@name != xmlItem.@name)
 for (var cn:int=xl.children().length()-1; cn >=0; cn--)
 delete xl.children()[cn];
 catch (ex:Error)
 Alert.show("error Real Root: " + ex.toString());
 else
 for each (var nodexm:XML in xmlRoot.children() )
 if (nodexm.@name != xmlParent.@name )
 try
 for (var cu:int=nodexm.children().length()-1; cu >=0; cu--)
 delete nodexm.children()[cu];
 catch (ex:Error)
 Alert.show("error No Real Root: " + ex.toString());
 private function appendChild(event:ResultEvent):void
 var node:XML = event.result as XML
 var sItem: XML = XMLtree1.selectedItem as XML;
 if (sItem.children().length() > 0)
 delete sItem.children();
 for(var i:int=0; i < node.children().length(); i++)
 var item:XML = node.children()[i];
 XMLtree1.selectedItem.appendChild(item);
 XMLtree1.expandItem(XMLtree1.selectedItem,true,true);
 deleteTreeNode(XML(XMLtree1.selectedItem));
]]>
</mx:Script>
<mx:Tree id="XMLtree1" width="350" height="470"
 showRoot="false" creationComplete="display()" itemClick="getChilds(event)" />
</mx:Application>
Thanks in advance

Thanks buddy for the answer.
Unfortunately the answer came after quite long time of posting the message. Anyway I was able to open a tree on demand using HttpService and due to my new requirement I changed it to RemoteObject.
I my latest change I am able to populate tree nodes on demand and also the same solution if getting update from server via JMS using Consumer object.
I kind a like this solution because it took me good amount of effort to find the right solution.
If any one is intersted the he/she can reply to the post and I can provide code here or may at some location so that it can be easily downloaded.
The solution is Flex-Grails combination.
Thanks everybody.

Hierarchical Tree control

Dear all,
Any body send me hints or sample codes about using Hierarchical tree control in forms

Type that into google and you should get some stuff. The biggest thing to remember is the query MUST have (presuming you are populating a tree from a db) certain values.
Check out this dicussion which I started when I was learning: Re: Creating a menu system (not a file menu)

Scrollbar in Tree Control = wonky

The TREE control scrollbar seems to have some ill-thought-out behavior.
1... Run the example TREE ENHANCEMENTS (Examples - Building UIs - Displaying Data - General )
2... Choose a folder on your machine with a few (3-5) folders in it but lots of files and folders contained within those folders.
3... Select the PATTERN as appropriate.
4... Run the VI. Your files should show up in the list, then the list collapses.
5... Expand the folders, so that there are more items in the list than it can display at one time.
6... The scrollbar appears (that's sensible).
7... Scroll down so that items disappear off the top.
8... Right click and choose CLOSE ALL ITEMS
--- I would expect the control to automatically move back up to the top, so you could see something, but it doesn't.
9... Play with the scrollbar thumb. Not exactly sensible.
Here is a JING to watch, showing this behavior.
The code that populates this tree is copied from the example (and modified to remove file extensions).
Once the tree is populated, the code is doing nothing (except waiting for a QUIT button).
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Just run the example I mentioned. It's not code that does it - it's the behavior of the tree control itself.
But you need to structure the folders so that you have a few (< # lines in tree) root-level folders, and many (> #lines in tree) sub-folders/files, whatever.
When you collapse the tree, I would expect the scrollbar to adapt to the new situation, and possibly disappear. Instead, it's working on old information, I suppose.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Expand Tree Control

I now have a Tree Control populated from an ArrayCollection
and using the defaultDataDescriptor.
At this point in the program the data exists only in the
myTree.dataProvider and the root node is at myTree.dataProvider[0]
or myTree.dataProvider.source[0] and I can see from the variables
window that the correct data is located here.
What do I have to put for 'item' in
myTree.expandChildrenOf(??item??, true). Everything I can think of
returns:
"Cannot access a property or method of a null object
reference."
Does anyone have any idea how to make this work.
Doug

The error occurs in the Flex file Tree.as at line 1383.
I can now see that the null object is not item -
dataProvider[0], this contains the correct data. The problem is
that iterator is null and therefore iterator.view is a null
reference.
Is there any way to solve this problem?
My ArrayCollection is built in pretty much the same way as
shown in:
Flex 2 Developer's Guide > Building User Interfaces for
Flex Applications > Using Data Providers and Collections
> Using hierarchical data providers > Data descriptors and
hierarchical data provider structure > Creating a custom data
descriptor
But I have used the defaultDataDescriptor and my arrays are
not built from literals.
Doug

Example: Universal Probe - LabVIEW Data to Tree Control

The Universal Probe is a Custom Probe that can view any data, by populating a LabVIEW Tree control with the data. Its input type is a Variant, and it dynamically parses the data. The the "Using the Universal Probe" section, below, on how to use the Universal Probe to probe anything and everything.
For a download and more info visit the Universal Probe page at OpenG.org

This is one way of doing it. Basically start from the parent and for each parent add its children to a queue. Then go over all of them until the queue is empty. There's some cleanup to do, but it shows the basic concept.
Try to take over the world!
Attachments:
tree_v2.vit ‏22 KB

How can I display and change built-in symbols of a tree control programmatically?

I want to set the built-in symbols of a tree control during runtime.
I only found an example to assign custom pictures but not how to select one of the 40 built-in symbol.
Many Thanks
Solved!
Go to Solution.

The ActiveItem.SymbolIndex will allow you to select the symbol for the active item. You can use the ListBox Symbol Ring Constant (Dialog and User Interface palette) to select a symbol (or you can just enter the number directly if you know what it is).
Message Edited by smercurio_fc on 07-10-2008 09:36 AM
Attachments:
Example_VI_BD6.png ‏2 KB

How to get all items under a parent item in a tree control

Hello,
I have 2 questions regarding a tree control:
1) Is there any way to specify a parent item tag and get an array of ALL its sub item tags? For example, in the attached vi, specify the Parent#2 parent tag and get an array containing Item#P21 and Item#P22
2) Is there a way to specify a range to the ActiveCell property. For example, all items from line#1 to line number#3
Any ideas?
Attachments:
Tree example.vi ‏6 KB

Mentos wrote:
1) Is there any way to specify a parent item tag and get an array of ALL its sub item tags? For example, in the attached vi, specify the Parent#2 parent tag and get an array containing Item#P21 and Item#P22
Did you try a search? There's no direct way of doing this. You have to navigate the tree and build up an array. You can find an example here: http://forums.ni.com/t5/LabVIEW/get-all-children-of-a-parent-in-tree/td-p/729548
2) Is there a way to specify a range to the ActiveCell property. For example, all items from line#1 to line number#3
No. (It's called ActiveCell, not ActiveCells) Presumably you are trying to perform an operation on multiple items. Unfortunately, you need to use a loop. You should defer panel updates if you're doing this a lot.

How to binding incoming xml node list to the tree control as dataProvider

Recently, I faced into one issue: I want to binding incoming xml node (it's not avaliable at start) list to the tree control as a dataProvider.
Since the incoming xml node list is not avaliable at beginning but I needs to bind it to the tree, so I create one virtual one in the xml, and prepare to remove it before the tree is shown. (ready for the actual node adding). But It did not work.
Please see the presudo-code here:
1. Model layer(CsModel.as)
public class CsModel
 [Bindable]
 public var treeXML:XML=<nodes><car label="virtualOne" id="1">
 </car></nodes>;
 (Here, I want to build binding relationship on the <car/> node,
 one 'virtual/stub' node is set here with lable="virtualOne".
 But this node will be deleted after IdTree
 control is created completely.)
 [Bindable]
 public var treeData:XMLList =new XMLListCollection(treeXML.car);
2. view layer(treePage.mxml)
 private var _model:CsModel = new CsModel();
 private function addNode():void
 var newNode:XML=<car/>;
 newNode.@label="newOne";
 newNode.@id=1;
 _model.treeXML.appendChild(newNode);
 private function cleanData():void
 delete _model.treeXML.car;
 <mx:VBox height="100%" width="100%">
 <mx:Button label="AddNode" click="addNode()" />
 <mx:Tree id="IdTree" labelField="@label"
 creationComplete="cleanData()"
 dataProvider="{_model}"/>
 </mx:VBox>
3. Top view layer (App.Mxml)
<mx:application>
 <treePage />
</mx:application>
For method: cleanData()，It's expected that when the treePage is shown, we first delete the virutalOne to provide one 'clear' tree since we don't want show virtualOne to the user. The virutalOne node just for building the relationship between treeData and treeXML at beginning. But the side effect of this method, I found, is that the relationship between treeXML and treeData was cut off. And this leads to that when I added new node (by click the 'addNode' button) to the xmlXML, the xmlData was not affected at all !
So Is there any other way to solve this issue or bind the incoming xml node list to the xmlListCollection which will be used as Tree control's dataProvider ?

If u want to display the name : value then u can do like this
<xsl:eval>this.selectSingleNode("name").nodeName</xsl:eval> : <xsl:value-of select="name" />

How can I save the all the values of a tree control ?

I have a problem, in run time, I adds new items on a tree control, but i don´t know how I can save the values of the child text of each item in a file.
Thanks.

I'm no expert on the tree control, but I made a small example to save all items to a textfile, including item tag, item string, and indent level. One drawback of this method is that it fully expands the tree regardless how the user left it. To go the other direction, you'd have to write a routine to go through the text file and programmatically build the tree.
To master the tree control, I think you have to resort to creating a control reference for it and using the Invoke Node to do some operations. For another approach to traversing and operating on a tree, check out the "Traversing Tree Controls and Setting Custom Symbols" (search the NI Developer Zone site).
Best of luck,
John
Attachments:
Save Tree Structure to Textfile.vi ‏32 KB

How can I drag and drop an item from one Tree control to another in LabVIEW 7.1?

You can use the mouse up and down event on the two tree controls but the problem is making the correct selection in the second tree control. I want to be able to switch over to the selection bar of the second tree control so that I can place my item in the correct position. I know all possible workarounds with double-clicks and so on... but I really want a windows drag and drop.
This is what I have for the moment. Please check the library below. I need to activate the selection bar of the second tree control somehow to get the position in the control. The VI below is written in LV 7.1
Attachments:
Drag&Drop.llb ‏65 KB

Hi Jones,
As far as I know this feature is currently not supported by the Tree control. A workaround, would be to use the vertical position of the mouse in the button up event to determine what line you�re dropping the item.
If you would like the Tree control to include the drag and drop feature, please submit this as a Product Suggestion under the feedback at www.ni.com/contact.
Good luck!
Best regards,
Philip C.
Applications Engineer
National Instruments
www.ni.com/ask
- Philip Courtois, Thinkbot Solutions

How to use the drop event of the tree control in LabVIEW 8.20?

Hi,
I am using the two tree controls in my application to provide a option for the user to drag and drop item from one tree to the other. I have to validate the user selection. I tried to capture the user drop event using the event structure. The problem I am facing is, I am not able to drop the item even though i have wired a constant true to the filter(Accepted?) in the event case. I have enable the property(Allow droping) in the right menu of the tree control also.
While configuring an event case for (drop, drag entered and some thing like this) only I am getting the problem otherwise it is working fine.
What do i need to do to caprture the drop event ?
Is there any way to avoid the item duplication while droping a new item in the tree control ?
or how can i do this?
Thanks,
Pandiarajan R

Hi Pandiarajan,
I hope you are doing well today! There is a lengthy discussion on the Tree Control Drag & Drop feature at this forums post including contributions from the developer of the Drag & Drop feature:
Tree Control Drag & Drop in LabVIEW 8
By avoiding item duplication, do you mean that you don't want the same item to be in the old tree control or do you not want more than one item in the new tree control?
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

How to get position of a ring in a tree control?

Ok, this is probably a stupid question, but how does one get the position of a ring inside of a tree control? I have a tree with two columns, with rings in the second column. I can set the position using SetTreeCellRingValueFromIndex(), but how does one get the position after the user has modified the control? I found the functions GetTreeCellRingIndexFromValue() and GetTreeCellRingValueFromIndex() but I haven't found a way to get either the Index or the Value of the ring (what I'm looking for is the index, but if I can obtain the value I can go from there). Thanks in advance!
Solved!
Go to Solution.

Hi,
You can use GetTableCellVal function to get the value of the ring.
There is not special "ring" function for that. Maybe that's what you were searching for
From the value you can get to the index using the functions you are already aware of.
Hope this helps,
S. Eren BALCI
www.aselsan.com.tr

Populating Tree control

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