Question

hi i am using Eclipse Rcp and i need to validate the textbox that only accept the integer value for that i have use the code

 txtCapacity.addKeyListener(new KeyAdapter() {
              public void keyPressed(KeyEvent EVT) {                     

                    if((EVT.character>='0' && EVT.character<='9')){
                          txtCapacity.setEditable(true);                    
                           txtCapacity.setEditable(true);

                      } else {
                          txtCapacity.setEditable(false);
                             System.out.println("enter only the numeric number");                                  
                      }
              }
      });

It validates But the Problem with this one is that i cannot use the Backspace key for deleteting the number. and please tell me idea for Validating the decimal too.
thanks in advance

Answer 1

As you are using a listener, you can empty the text field, instead of making it not-editable. You can do something like this, the snippet is based upon your code.

txtCapacity.addKeyListener(new KeyAdapter() {
        public void keyReleased(KeyEvent EVT) {                     
             if(!(EVT.character>='0' && EVT.character<='9')){
                    txtCapabity.setText(""); 
             }
        }
});

Or better if you use JFormattedTextField. I’m not sure if you have that in SWT, even if you don’t then try to look for the similar.