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How to enable a JButton only when certain requirements are fullfilled

Isuru Buddhika
Greenhorn

Joined: Nov 04, 2012
Posts: 11

I'm designing a GUI for a retail shop system and there I have a form to Add a customer. I want to make the add button enabled only after all the textfields are filled? Can you tell me the best way to do this?
Paul Clapham
Sheriff

Joined: Oct 14, 2005
Posts: 19553
    
  10

Set the button to "disabled" initially. Each time any of the text fields is changed, check all of them and enable the button if and only if all of the text fields are filled in. And to be notified when any of the text fields is changed, add a DocumentListener to each of them and override the appropriate methods to do that check.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: How to enable a JButton only when certain requirements are fullfilled