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Jtable filtering

Posted on 2008-10-11
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Last Modified: 2013-12-22
How to use filter on a particular column if  jtable depending on key stroke. LIke if press A then then only rows matching A as starting character of that particular column should display. If i press AB then starting with AB like this.

Any help appreciated.

Thanks
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Question by:techvts
2 Comments
 
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Expert Comment

by:Monky42
Comment Utility
Quick idea:
Add a textfield to the form/panel/frame. Give the textfield focus (so that typing will change the textfield values). Add a listener to the textfield (textfield.getDocument().addDocumentListener(yourListener);) and update your table when the textfield value has been changed.
For JTable filtering there are lots of tutorials out there (e.g. http://www.java2s.com/Code/Java/JDK-6/JTableFiltering.htm)

Good Luck!
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Accepted Solution

by:
mih earned 50 total points
Comment Utility
There is a good tutorial on the subject of keystroke capture at http://java.sun.com/docs/books/tutorial/post1.0/ui/keylistener.html. However, the following may also help (although will only search on alphanumeric text cell content within the most recently selected table column as it currently stands):

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import javax.swing.JTable;
 

/**

 * Example (cut-down) implementation of a keyboard listener for

 * providing JTable row selection via keyboard input matches to

 * column content. Additional validation and error checking should

 * be included in any production version.

 * <p>

 * Copyright (c) 2008, Innovation Science Pty Ltd. This software

 * is licensed under the <a href=

 * "http://creativecommons.org/licenses/LGPL/2.1/">

 * CC-GNU LGPL</a> version 2.1 or later.

 * <p>

 * @author MB/MH, Innovation Science Pty Ltd

 * @version 1.0.0

 */

public class ExampleKeyListener extends KeyAdapter

{

  private JTable theTable;

  private long lastKeyTime = 0;

  private StringBuffer currentString;
 

  public ExampleKeyListener ( JTable aTable )

  {

    super();

    theTable = aTable;

    currentString = new StringBuffer();

  }
 

  /**

   * Scrolls to and selects the row of the table associated with this

   * Key Listener instance by matching the sequence of characters

   * pressed during the past two (2) seconds with the contents of 

   * cells in the currently selected table column. The first cell

   * containing text that starts with the search character sequence

   * will determine the row to be selected. No selection change is 

   * made if the character sequence does not match any of the cells

   * in the currently selected table column. 

   */

  public void keyPressed( KeyEvent aKeyEvent )

  {

    // Reset the search string if too much time has elapsed since 

    //  the last key press event

    long currentTime = System.currentTimeMillis();

    if ((currentTime - lastKeyTime) > 2000)

    {

      currentString.setLength( 0 );

    }

    lastKeyTime = currentTime;
 

    // Determine key that caused KeyEvent to be generated

    // *** NOTE THIS SHOULD HAVE ADDITIONAL CHECKING TO ENSURE *** 

    // *** ONLY VALID, SEARCHABLE CHARACTERS ARE CONSIDERED ***

    char keyChar = aKeyEvent.getKeyChar();

    currentString.append( keyChar );

    // Determine the currently selected table column (default to

    // first column)

    int columnIndex = Math.max( theTable.getSelectedColumn(), 0 );
 

    // Loop through each value in the table and check if 

    //  it matches the current String

    int rowCount = theTable.getRowCount();

    String testString = currentString.toString().toLowerCase();

    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) 

    {

      String rowValue = ((String)theTable.getValueAt( rowIndex,

                          columnIndex )).toLowerCase();

      if (rowValue.startsWith( testString )) 

      {

        // Scroll to and highlight the matching selection

        theTable.setRowSelectionInterval( rowIndex, rowIndex );

        theTable.scrollRectToVisible( 

            theTable.getCellRect( rowIndex, columnIndex, true ) );

        break;

      }

    }

  }

} 

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