Selection of Radio button, when combo box is selected

[Sophiya Behera]

Hi all,
I am facing a issue in dynamic selection of radio button. I want to select a radio button at runtime and it depends on the selection of combobox. I have tried the following code
radiobutton.setSelected(true) and radiobutton.getmodel().setselected(true). But nothing is working. Please help me in this.


Regards
Sophiya

[Swastik Dey]

Are you sure that combo box selection event is triggering properly?

[Sophiya Behera]

Hi Swastik,

Thnks for your reply.

Yes the event is triggered properly. I have debugged through each line. After setting setSelected(true) i checked for isSelected(), itis showing true. But in UI, the button is not selected. Could you please tell me any other example, if one simple button is clicked, how the radio button is selected.... That also will help me.



Regards
Sophiya

[Swastik Dey]

Hi Sophiya

You can have a look on this

public class RadioTest extends JFrame{
	private ButtonGroup _cgrp;
	private JRadioButton _rb1;
	private JRadioButton _rb2;
	private JButton _btn1;
	private JButton _btn2;
	
	public RadioTest(){
		_cgrp=new ButtonGroup();
		_rb1=new JRadioButton("R1");
		_rb2=new JRadioButton("R2");
		_cgrp.add(_rb1);
		_cgrp.add(_rb2);
		setLayout(new FlowLayout());
		add(_rb1);
		add(_rb2);
		_btn1=new JButton("R1");
		_btn2=new JButton("R2");
		add(_btn1);
		add(_btn2);
		_btn1.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				_rb1.setSelected(true);
			}
			
		});
		_btn2.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				_rb2.setSelected(true);
			}
			
		});
	}
	
	public static void main(String arg[]){
		RadioTest rt=new RadioTest();
		rt.setSize(300,300);
		rt.setVisible(true);
	}
}

[Sophiya Behera]

Swastik,
This example works. But my scenario is bit complex. I have created a panel and created group of radio buttons in that panel in a class. And i am trying to get hold of the radio button through button group. Please refer to below code. Please suggest...

Enumeration<AbstractButton> enumButtons;
String[] arrDfltVal = getDfltValArr();

for(int i=0;i<arr.length;i++){

enumButtons = arr[i].getBtnGroup().getElements();
while (enumButtons.hasMoreElements()){


//*AbstractButton ab= enumButtons.nextElement();
JRadioButton ab= (JRadioButton)enumButtons.nextElement();
//arr[i].getBtnGroup().setSelected(ab, true);


if ((ab.getName()).equalsIgnoreCase(arrDfltVal[i])){
System.out.println("isSelected"+ab.isSelected()+ab.getModel().isSelected());
//arr[i].getBtnGroup().setSelected(ab.getModel(), true);
ab.setSelected(true);
System.out.println("isSelected"+ab.isSelected()+ab.getModel().isSelected());

}

}


}

[Swastik Dey]

Hi Sophiya

It should be possible that you too. The code could have been better, but I did it in a hurry.

public class RadioTest extends JFrame{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private ButtonGroup _cgrp;
	private ButtonGroup _cgrp1;
	private JRadioButton _rb1;
	private JRadioButton _rb2;
	private JRadioButton _rb3;
	private JRadioButton _rb4;
	private JButton _btn1;
	private JButton _btn2;
	private ButtonGroup _bgArr[]=new ButtonGroup[2];
	public RadioTest(){
		_cgrp=new ButtonGroup();
		_cgrp1=new ButtonGroup();
		_rb1=new JRadioButton("R1");
		_rb2=new JRadioButton("R2");
		_rb3=new JRadioButton("R3");
		_rb4=new JRadioButton("R4");
		_cgrp.add(_rb1);
		_cgrp.add(_rb2);
		_cgrp1.add(_rb3);
		_cgrp1.add(_rb4);
		setLayout(new FlowLayout());
		add(_rb1);
		add(_rb2);
		add(_rb3);
		add(_rb4);
		_btn1=new JButton("R1");
		_btn2=new JButton("R2");
		add(_btn1);
		add(_btn2);
		this._bgArr[0]=_cgrp;
		this._bgArr[1]=_cgrp1;
		_btn1.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				handleEvent(_btn1);
			}
			
		});
		_btn2.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				handleEvent(_btn2);
			}
			
		});
	}
	
	private void handleEvent(JButton btn){
		for(int x=0;x<_bgArr.length;x++){
			if(btn==_btn1){
				ButtonGroup bg=this._bgArr[x];
				Enumeration<AbstractButton> enm=bg.getElements();
				while(enm.hasMoreElements()){
					JRadioButton rb=(JRadioButton)enm.nextElement();
					if("R1".equalsIgnoreCase(rb.getText())){
						rb.setSelected(true);
					}
					if("R3".equalsIgnoreCase(rb.getText())){
						rb.setSelected(true);
					}
				}
			}
			else{
				ButtonGroup bg=this._bgArr[x];
				Enumeration<AbstractButton> enm=bg.getElements();
				while(enm.hasMoreElements()){
					JRadioButton rb=(JRadioButton)enm.nextElement();
					if("R2".equalsIgnoreCase(rb.getText())){
						rb.setSelected(true);
					}
					if("R4".equalsIgnoreCase(rb.getText())){
						rb.setSelected(true);
					}
				}
			}
		}
	}
	public static void main(String arg[]){
		RadioTest rt=new RadioTest();
		rt.setSize(300,300);
		rt.setVisible(true);
	}
}

[Michael Dunn]

> After setting setSelected(true) i checked for isSelected(), itis showing true. But in UI, the button is not selected.

quite likely you have duplicate declarations of your radioButtons
1) a class field referenced by the listener
2) a local variable where you add the radioButtons to the gui,
these are the radioButtons seen on the screen, but not 'seen' by the listener

would be much easier for you to get a solution if you posted a 'simple' working example
of the problem - just a frame, comboBox, 2 radioButtons and the listener code.

[Sophiya Behera]

Hi Swastik,
My issue is resolved. I have taken the same approach, but i was going wrong while accessing array of buttons. Everytime the values in the array was getting initialised. Thnks for your code.


Regards
Sophiya

[Sophiya Behera]

Hi Michael,
My issue is resolved and the reson what you have specified is quite similar to my issue. Thanks for your reply.


Regards
Sophiya

[Swastik Dey]

You are welcome.