Refreshing JTable contents (rows and columns) handling.
Hi,
I have a general question related to refreshing the contents of JTable and handling some application specific requirements.In our application we are planning to refresh the contents of JTable automatically after certain period of time by fetching data from database and update the JTable contents or user has clicked refresh button.
But following scenarios we are planning to handle when refresh is called automatically or user has clicked refresh button.
1) User is working with data of JTable. Like rows of JTable has checkBoxes and user selects them and doing operation like viewing the details of selected rows in new details dialog. So if refreshing is done then the selection will be lost if I update the whole data in JTable.
a)Will it be possible to append the data at the end of JTable rows without disturbing the existing JTable contents.
b) Is it feasible to compare the data of existing rows and newly fetched rows and update only the rows whose values are changed in database or update specifically updated columns. But this comparision for finding changed values will result in performance problems.So are there any other alternatives of doing this, ideas are most welcome.
c) Simple way is to alert the user that data will be updated and everything will be refreshed will be the choice in worst case.
I guess many may have encountered such problems and may have solved it depending on the product requirements.
Ideas and suggestions are most welcome.
Regards.
Hi,
Here are my views and my assumptions.
Assumptions :
1) Your JTable is populated with list of Objects.
2) Your tables in database is having columns like created date, created time, updated date updated time
3) Order by clause for all the time will remain same.
If these assumptions are correct then I think you can achieve your goal.
Here how it is.
Your application session will maintain last db hit time and will maintain for every hit that applicate made to fetch data from db.
When object is created on the server side once it fetch data from table it will compare the created date/time or update date/time with the session varibale that holds last visit date/time. Based on this flag need to be set to indicate if this item is added/updated/deleted since last visit.
And when all these object is returned to your client, the table model will iterate through the list and based on object index in the list and and if object is changed will update only that perticular row.
Hope this is what you want to achieve.
Regards
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Could anyone tip me how to make fixed row and column in the same table(s).
I know how to make column fixed and row, tried to combine them but it didnt look pretty.
Can anyone give me a tip?
Thanks! :)Got it to work!
heres the kod.. nothing beautiful, didnt clean it up.
* NewClass.java
* Created on den 29 november 2007, 12:51
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package tablevectortest;
* @author Sockan
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
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Object[] column;
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private int FIXED_NUM = 16;
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data = new Object[][]{
{ "","A","A","A","",""},
{ "a","b","","","",""},
{ "a","","c","","",""},
{ "","","","d","",""},
{ "","","","","e",""},
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{ "","b","","","",""},
{ "","","c","","",""},
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{ "","b","","","",""},
{ "","","c","","",""},
{ "","","","d","",""},
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{ "I","","W","G","A",""}};
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return data.length;
public String getColumnName(int col) {
return (String) column[col];
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return data[row][col];
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public int getColumnCount() { return column.length-2; }
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public String getColumnName(int col) {
return (String)column[col+1];
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public int getColumnCount() { return 1; }
public int getRowCount() { return data.length - FIXED_NUM; }
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import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.table.*;
import java.util.*;
import java.awt.*;
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Hi,
I need to freeze first two rows and columns in a large JTable. I found ways to freeze either a row or a column, but not both at the same time.
Can any of you help ?
Found this code which allows freezing a col. Similar method can be used to freeze column
import javax.swing.JScrollPane;
import javax.swing.JTable;
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}Hi,
I need to freeze first two rows and columns in a large JTable. I found ways to freeze either a row or a column, but not both at the same time.
Can any of you help ?
Found this code which allows freezing a col. Similar method can be used to freeze column
import javax.swing.JScrollPane;
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import javax.swing.JViewport;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableModel;
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TableModel frozenModel = new DefaultTableModel(
model.getRowCount(),
colsToFreeze);
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Thank you for your reply. I'm sorry for not clear question.
Answer for your question:
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Regards
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This issue was raised in the Java Programming forum. Received initially as a weird requirement, it now seems that it is more common than you might think. Under it's original title it was "JTable - Limitation or Not?"
I introduced the topic here so that the thread perspective can include more experienced Swing developers.
The JTable in it's default layout is intended to hold database tables with records in rows. But what if you want records in columns?
Some have said why? Just accept the row layout. Others have said use a customised form. Both reasonable views. Despite this, others report that the inherrited power of the JTable is worth leveraging and they have been doing it for years. Albeit with messy code in certain cases.
This is a clear candidate for a popular derived component. If the existing JTable were renamed as a JTableRecordPerRow I am describing a JTableRecordPerColumn. The corresponding Table Model must naturally have a getRowClass method and no getColumnClass method.
Java is good at seperating data from display issues so essentially this is only a display issue. The data representation is unaffected.
While this may be so, the TableModel for a JTable makes the link from the display to the data so it must have knowledge about cell type to trigger the correct cell editor for example.
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While this may not be an ideal topic for anyone just learning Swing I have been encouraged to consider the general case within the limitations of the cell types normally supported by the default Table model.
I would have a guess that this is an established component in many private Java libraries already.
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Perhaps the original design could have allowed for an aternative layout manager of somekind but this could easily have made description of records/rows and fields/columns confusing.
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In the descriptions below a distinction is made between the normal internal data model representation of a row, called "mrow", and the displayed form "row".
Only the TableModel need be changed.
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Four steps with seven parts seems worth it to me.
The power of Swing!
Many thanks to all. -
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Cheers,
MartinAre you trying to use a seperate table for each column.
Thats not a good idear.
Here is what you have to do.
1. Create a sub class of JTable
2. You will have to redefine how the selection is done so. You will need some sort of a collection to store the list of selected cells indexes
2.1 Selecting a cell is simply adding the coordinations of the cell to the selection
2.2 de selecting is just removing it from the collection.
2.3 Here is what you have to override
setColumnSelectionInterval()
setColumnSelectionInterval()
changeSelection()
selectAll()
getSelectedColumns()
getSelectedColumn()
getSelectedRows()
getSelectedRow() You migh also need few new methods such as
setCellSelected(int row, int column, boolean selected);
boolean isCellSelected(int row, int column);
clearSelection();
int[][] getSelectedCells();You will have to implement the above in terms of your new data structure.
3. Handle mouse events.
Ex:- when user cicks on a cell if it is already selected it should be deselected (see 2.2)
other wise current selected should be cleared and the clicked cell should be selected
if your has pressed CTRL key while clicking the the cell should be selected without deselecting the old selection.
---you can use above using a MouseListener
When the user hold down a button and move the mouse accross multiple cell those need to be selected.
--- You will need a MouseMotionListener for this
You might also need to allow selection using key bord. You can do that using a KeyListener
4. Displaying the selection
You have to make sure only the selected cells are high lighted on the table.
You can do this using a simple trick.
(Just override getCellEditor(int row, int column) and getCellRenderer(int row, int column) )
Here is what you should do in getCellRenderer(int row, int column)
public TableCellRenderer getCellRenderer(int row, int column)
TableCellRenderer realRenderer = super.getCellRenderer(int row, int);
return new WrapperRenderer(realRenderer,selectedCellsCollection.isCellSelected(row,column));
static class WrapperRenderer implements TableCellRenderer{
TableCellRenderer realRenderer;
boolean selected;
public WrapperRenderer(TableCellRenderer realRenderer, boolean selected){
this.realRenderer = realRenderer;
this.selected = selected;
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column){
return realRenderer.getTableCellRendererComponent(table,value,selected,hasFocus,row,column);
}What the above code does is it simply created wrapper for the Renderer and when generating the rendering component it replaces the isSeleted flag with our on selected flag
and the original renderer taken from the super class will do the rest.
You will have to do the same with the TableCellEditor.
By the way dont use above code as it is becouse the getCellRenderer method create a new instance of WrapperRenderer every time.
If the table has 10000 cells above will create 10000 instances. So you should refine above code.
5. Finnaly.
Every time the selection is changes you should make the table rerender the respective cells in or der to make the changes visible.
I'll leave that part for you to figure out.
A Final word
When implementing th above make sure that you do it in the java way of doing it.
For the collection of selected cells write following classes
TableCellSelectionModel // and interface which define what it does
DefaultTableCellSelectionModel //Your own implementation of above interface the table you create should use thisby default
//To communicate the selection changes
TableCellSelectionModelListener
TableCellSelectionModelEventif you read the javadoc about similer classes in ListSelectionModel you will get an idear
But dont make it as complex as ListSelectionModel try to keep the number of methods less than 5.
If you want to make it completly genaric you will have to resolve some issues such as handling changes to the table model.
Ex:- Rows and colums can be added and removed in the TableModle at the run time as a result the row and column indexes of some cells might change
and the TableCellSelectionModel should be updated with those changes.
Even though the todo list is quite long if you plan your implementation properly the code will not be that long.
And more importantly you will learn lots more by trying to implementing this.
Happy Coding :) -
Method to locate row and column in TableView
In a TableView.setOnMouseClicked ()
How to capture that row and column were clicked?I am having problem in populating data from a table in one screen to a Text Field in the other screen. I have two classes FirstClass containing a textbox and a button. On pressing a button a second window is opened containing a Table of values. As the user double clicks a row the value of the second column of the row should be inserted into the textbox of the FirstClass. Code of both the classes is attached. Thanking you in anticipation.
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class FirstClass extends Application {
public static void main(String[] args) {
launch(args);
@Override
public void start(final Stage primaryStage) {
primaryStage.setTitle("First Class");
GridPane gridpane = new GridPane();
gridpane.setPadding(new Insets(5));
gridpane.setHgap(5);
gridpane.setVgap(5);
final TextField userNameFld = new TextField();
gridpane.add(userNameFld, 1, 1);
Button btn = new Button();
btn.setText("Show Table");
gridpane.add(btn, 1, 3);
btn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
String a = TableClass.showDialog(primaryStage, true, "Table Window" );
userNameFld.setText(a);
StackPane root = new StackPane();
Scene scene =new Scene(root, 300, 250);
root.getChildren().addAll(gridpane);
primaryStage.setScene(scene);
primaryStage.show();
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Modality;
import javafx.stage.Stage;
public class TableClass extends Stage {
private static TableClass dialog;
private static String value = "";
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private Person(String fName, String lName) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
public String getFirstName() {
return firstName.get();
public void setFirstName(String fName) {
firstName.set(fName);
public String getLastName() {
return lastName.get();
public void setLastName(String fName) {
lastName.set(fName);
private TableView<Person> table = new TableView<Person>();
private final ObservableList<Person> data =
FXCollections.observableArrayList(
new Person("JACK", "BROWN"),
new Person("JOHN", "VIANNEYS"),
new Person("MICHAEL", "NELSON"),
new Person("WILLIAM", " CAREY")
public TableClass(Stage owner, boolean modality, String title) {
super();
initOwner(owner);
Modality m = modality ? Modality.APPLICATION_MODAL : Modality.NONE;
initModality(m);
setOpacity(1);
setTitle(title);
StackPane root = new StackPane();
Scene scene = new Scene(root, 750, 750);
setScene(scene);
GridPane gridpane = new GridPane();
gridpane.setPadding(new Insets(5));
gridpane.setHgap(5);
gridpane.setVgap(5);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(
new PropertyValueFactory<Person,String>("firstName")
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(200);
lastNameCol.setCellValueFactory(
new PropertyValueFactory<Person,String>("lastName")
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol);
table.setOnMouseClicked(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
if (me.getClickCount() >= 2) {
String srr = table.getItems().get(table.getSelectionModel().getSelectedIndex()).getLastName();
value = srr;
dialog.hide();
gridpane.add(table, 1, 5,1,20 );
root.getChildren().add(gridpane);
public static String showDialog(Stage stg, Boolean a , String title){
dialog = new TableClass( stg,a, title);
dialog.show();
return value;
} -
Get Row and Column info from an Array Cluster
I have an array with a cluster of 2 elements (string and double). Within my application, I am using the State Machine architecture with an Event Structure. When I click on a element within the cluster array, is there a way to retrieve the row and column? I seen the Coordinates within the Mouse Down event but I don't think that will work.
Any ideas?
Solved!
Go to Solution.How To Return the Index of a Mouse-Select Array Element:
https://decibel.ni.com/content/docs/DOC-6406
Jean-Marc
LV2009 and LV2013
Free PDF Report with iTextSharp -
Maximum number of rows and columns in data form
Hi,
I wanted to know if there is a limitation to the number of rows and columns that can be displayed in a data form, in Hyperion planning 11.1.2.1 ?
And what would be the most appropriate number of rows and columns to be included for optimum performance.
Thanks.Hi,
While its a fun fact to determine how much one can stuff into a web form, the reality is: how much can a user reasonably consume in a web form?
And what would be the most appropriate number of rows and columns to be included for optimum performance
You will find that the answer to this is by "what design makes a web form most usable?" And no, the users don't really know what they want from a design perspective, they see it in their head, but usually what they ask for is something that would look entirely different (huge).
The next thing to think about is the use of member selection functions in the page axis. IDescendants(Entity) in a dropdown could cause issues just as easily as too many rows - and again make the drop down unusable for a user.
If your question is a bit more technical, then consider this (somewhat oversimplified): Web forms are constructed by a process on the server. Objects are created based on the form's definition and used by the process that builds the form. The process uses Cartesian looping (lots of iterations) to construct the form cell by cell, starting at the top left and finishing up in the bottom right. If the form has a million cells on it, then the loop and all the code within it runs a million times. The capability of the server has a lot to do with how well it can handle this request, and how many it can handle at one time.
The result of this is gobs of HTML and JavaScript. All of this has to be sent over a network to the requesting client. The client starts receiving the web page code and has to render it in the browser and run the JavaScript. The ability to do this is limited by the browser, the OS, and the hardware that the client is running on.
And that's just rendering the page for use.
Now it has to be interacted with on the client machine, and changes parsed, packaged, and sent back to the server.
So the technical answer is, there can be many limitations to how many rows and columns a data form can have - none of which can truly be anticipated by anyone. This is why I put the part about usability first in this post.
Regards,
Robb Salzmann -
Setup for discoverer table for showing number of Rows and columns of Report
As oracle discoverer report show "Rows 1-25 of"(Total rows) and "Column 1-6 Of"(Total Column).
This total rows and columns information's is not appearing on our reports.
Kindly let us know its setting/setups .
This is very urgent to us, Any help will be highly appreciated.
Thanks, AvaneeshHmm, what version of Discoverer are you on? Do I understand you correctly that you are able to run a Discoverer report and see this rows and columns information? What software are you running when you do this - Viewer, Plus, or Desktop? Where is this showing up - the top of the report maybe? Or maybe the bottom of the report? The only thing I can think of to handle this is the Page Setup for a workbook, and looking at the Header and Footer sections of that setup. But I am on Discoverer 10.1.2.2 and I don't see anything I can insert on the header/footer that would show this kind of information. Desktop will let you do Page x of y pages (Plus does not), but that is not what you are seeing. You can maybe look at the page setup and see if there is something there not documented in the Discoverer guides.
John Dickey
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