TextField not updating dynamically

Question

this is a really simple code in which text on a button is copied to a TextField. The code works fine but the TextField is not updating instantly on clicking the button. It updates only after i click on the TextField or when i drag the form not on pressing the button instantly. why is this happening,this behavior is unexpected. i am testing this code on a nokia 501 emulator which supports LWUIT.

           a = new Form("CALCULATOR")
                   final TextArea data = new TextArea();
           final Button ab = new Button("Some Value");
           ab.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub

                data.setText(ab.getText());

            }

           });
           a.addComponent(ab);
           a.addComponent(data);
           a.show();
                   }

hmm ... now which framework is it? Looks at least unrelated to Swing (Button is a AWT component in desktop context) — kleopatra, Jun 26 '13 at 13:46
its LWUIT it's quite similar to swing , that's why i added the swing tag — user2497398, Jun 26 '13 at 13:54

score 5 · Answer 1 · answered Jun 26 '13 at 13:32

5

After setting the text in the textfield repaint it. This may work

  data.setText(ab.getText());
  data.validate(); or data.repaint();

answered Jun 26 '13 at 13:32

pundit

322
1
7

FYI you need only the validate. Its not a painting issue its a layout issue, the text field needs to grow. You should also accept pundit's answer and ideally vote it up. – Shai Almog Jun 26 '13 at 17:26

score 0 · Answer 2 · answered Jun 26 '13 at 08:38

That happen because your Code. I explain:

you call to function actionPerformed: this is lisitner that call when user make action like "after i click on the TextField..".

what you need to do is simple:

  a = new Form("CALCULATOR")
               final TextArea data = new TextArea();
       final Button ab = new Button("Some Value");
       ab.addActionListener(new ActionListener(){
       data.setText(ab.getText());
       a.addComponent(ab);
       a.addComponent(data);
       a.show();
               }

score 0 · Answer 3 · answered Oct 22 '15 at 20:46

          a = new Form("CALCULATOR")
                   final TextArea data = new TextArea();
           final Button ab = new Button("Some Value");
           ab.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub

              //  data.setText(ab.getText()); // You should not use this

                // Use this instead
                  data.setText(ab.getActionCommand());

            }

           });
           a.addComponent(ab);
           a.addComponent(data);
           a.show();
                   }

TextField not updating dynamically

3 Answers3

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