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Thread: JTextArea addActionListener

  1. #1
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    Default JTextArea addActionListener

    I am on the controller side of my application and I am having a issue with adding a actionListener to my JTextArea.

    package addItemBtn.Home.DataBase;
     
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    import javax.swing.event.DocumentEvent;
    import javax.swing.event.DocumentListener;
     
    public class AddItemController 
    {
    	private AddItemModel model;
    	private AddItemView view;
     
    	AddItemController()
    	{
     
    		//adding actionListeners for the AddItemClass
    		view.cancelBtn.addActionListener(new ActionListeners());
    		view.submitBtn.addActionListener(new ActionListeners());
    		view.previewBtn.addActionListener(new ActionListeners());
    		view.nameBox.addActionListener(new ActionListeners());
    		view.priceBox.addActionListener(new ActionListeners());
    		view.locationBox.addActionListener(new ActionListeners());
    		view.descriptionBox.addActionListener(new ActionListeners());
    	}
     
    	class ActionListeners implements ActionListener
     
    	{
     
    		@Override
    		public void actionPerformed(ActionEvent e) {
    			// TODO Auto-generated method stub
     
    		}
     
     
    	}
     
    }

    view.descriptionBox.addActionListener(new ActionListeners());//this is where my error is

    Error states: The method addActionListener(AddItemController.ActionListener s) is undefined for the type JTextArea)

    I clicked on each of the suggestions it gives me but it is still not working. Another things is I found examples on the web with people using actionListener with JTextArea..... Any advice?


  2. #2
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    Default Re: JTextArea addActionListener

    Its simple as that. A JTextArea does not support ActionListeners.
    What kind of "Action" should a JTextArea produce in your opinion?
    Perhaps you should try with a different listener.

  3. #3
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    Default Re: JTextArea addActionListener

    yes I understood the error and and read the API doc and still get the same issue:

    package addItemBtn.Home.DataBase;
     
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    import javax.swing.event.DocumentEvent;
    import javax.swing.event.DocumentListener;
     
     
    public class AddItemController 
    {
    	private AddItemModel model;
    	private AddItemView view;
     
    	AddItemController(AddItemModel model,AddItemView view)
    	{
    		this.model = model;
    		this.view = view;
     
    		//adding actionListeners for the AddItemClass
    		view.cancelBtn.addActionListener(new ActionListeners());
    		view.submitBtn.addActionListener(new ActionListeners());
    		view.previewBtn.addActionListener(new ActionListeners());
    		view.nameBox.addActionListener(new ActionListeners());
    		view.priceBox.addActionListener(new ActionListeners());
    		view.locationBox.addActionListener(new ActionListeners());
    		view.descriptionBox.addDocumentListener(new ActionListeners()); //error is here
     
    		view.frame.setVisible(true);
    	}
     
    	class ActionListeners implements ActionListener, DocumentListener
     
    	{
     
    		@Override
    		public void actionPerformed(ActionEvent e) 
    		{
    			try
    			{
    				if(e.getSource() == view.submitBtn)
    				{
    					System.out.println("submit Pressed");
    				}
    				else if(e.getSource() == view.cancelBtn)
    				{
    					view.frame.dispose();
    					System.out.println("Cancel Pressed");
    				}
    				else if(e.getSource() == view.previewBtn)
    				{
     
    				}
    				else if(e.getSource() == view.descriptionBox)
    				{
     
    				}
    				else if(e.getSource() == view.nameBox)
    				{
     
    				}
    				else if(e.getSource() == view.priceBox)
    				{
     
    				}
    				else if(e.getSource() == view.locationBox)
    				{
     
    				}
    				else
    				{
    					System.out.println("else");
    				}
     
    			}catch(Exception ex)
    			{
    				System.out.println("There was an error "+e);
    			}
     
    		}
     
    		@Override
    		public void insertUpdate(DocumentEvent e) {
    			// TODO Auto-generated method stub
     
    		}
     
    		@Override
    		public void removeUpdate(DocumentEvent e) {
    			// TODO Auto-generated method stub
     
    		}
     
    		@Override
    		public void changedUpdate(DocumentEvent e) {
    			// TODO Auto-generated method stub
     
    		}
     
     
    	}
     
    }

    Also my actionListeners are not working. I put println statements in there to double check and nothing it happening.

  4. #4
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    Default Re: JTextArea addActionListener

    I put println statements
    They're inside if statements which means they may not be executed. Add a println() first thing in the method, outside of the if statements.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: JTextArea addActionListener

    it is simply a JTextArea from AddItemView()

  6. #6
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    Default Re: JTextArea addActionListener

    Review the JTextArea API (near the top) for the technique required to add a document listener. Your existing approach is incorrect.

  7. #7
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    Default Re: JTextArea addActionListener

    Thank you. When in doubt read the API.

    TextListener!! Says it plan as day...

  8. #8
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    Default Re: JTextArea addActionListener

    You're welcome, and that's a good rule to follow.

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