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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
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2 Comments
 
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Expert Comment

by:Monky42
ID: 22694713
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
ID: 22911132
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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