HOWTO: Clearing a Selection in an AFC UIChoice Control

• Microsoft Win32 Virtual Machine
• Microsoft SDK for Java, versions 2.0, 2.01, 2.02, 3.0, 3.1, 3.2

SUMMARY

You can programmatically clear a UIChoice selection by setting its selected index to -1.

MORE INFORMATION

The sample code below demonstrates how to use setSelectedIndex(-1) to clear the item currently selected in the UIChoice. Compile and run the program, select an item in the UIChoice control, then click the "Clear UIChoice" button. This results in the setSelectedIndex method getting called with a value of -1, clearing the previously selected item from the UIChoice control.

Sample Code

import com.ms.ui.*;
import com.ms.ui.event.*;

public class ResetUIChoiceDemo implements IUIActionListener {
  UIChoice choice=null;

  public ResetUIChoiceDemo(UIChoice choice) {
    this.choice=choice;
  }

  public static void main(String args[])
  {
    UIFrame frame = new UIFrame("AFC Frame");
    frame.setSize(320,50);
    frame.setLayout(new UIGridLayout(0,2));
    UIChoice choice=new UIChoice();
    choice.addString("ChoiceA");
    choice.addString("ChoiceB");
    choice.addString("ChoiceC");
    choice.addString("ChoiceD");
    frame.add(choice);
    UIPushButton clearButton=new UIPushButton("Clear UIChoice");
    clearButton.addActionListener(new ResetUIChoiceDemo(choice));
    frame.add(clearButton);
    frame.setVisible(true);
  }

  public void actionPerformed(UIActionEvent e) {
    choice.setSelectedIndex(-1);  // Clear the UIChoice selection.
  }
} 

REFERENCES

For more information please see the Microsoft SDK for Java 2.0x documentation, available at http://www.microsoft.com/java/sdk/.
For the latest Knowledge Base articles and other support information on Visual J++ and the SDK for Java, please see the following pages on the Microsoft Technical Support site:

http://support.microsoft.com/support/visualj/

http://support.microsoft.com/support/java/

Additional query words:

Keywords          : kbJAFC kbSDKJava300 kbSDKJava310 AWTPkg kbSDKJava320 
Version           : WINDOWS:2.0,2.01,2.02,3.0,3.1
Platform          : WINDOWS 
Issue type        : kbhowto 

Last Reviewed: July 14, 1999