Validate all fields in Swing GUI

Question

I have a Question. I created a Swing GUI Form. This form contain JTextFields, JComboBox components.

Now what i want to do, when user pressing completed button i want to validate JTextFields and JComboBox component. I want to write common method for all JTextFields and another common method for JComboBoxes. Does anyone know about validate API?

I dont need to validate all fields one by one.

what do you meaning, whats validations (in container, value from, e.i. ???.) — mKorbel, Nov 24 '12 at 17:54
You could have a look at [JGoodes bindings](http://www.jgoodies.com/freeware/libraries/binding/) — MadProgrammer, Nov 24 '12 at 20:27

Reimeus · Answer 1 · 2012-11-24T18:07:19.753

One option here would be to use Swing's InputVerifier to validate input for every JComboBox & JTextField used. You could share common verifiers between components:

   public class MyNumericVerifier extends InputVerifier {
        @Override
        public boolean verify(JComponent input) {
           String text = null;

           if (input instanceof JTextField) {
             text = ((JTextField) input).getText();
           } else if (input instanceof JComboBox) {
             text = ((JComboBox) input).getSelectedItem().toString();
           }

           try {
              Integer.parseInt(text);
           } catch (NumberFormatException e) {
              return false;
           }

           return true;
        }

        @Override
        public boolean shouldYieldFocus(JComponent input) {
           boolean valid = verify(input);
           if (!valid) {
              JOptionPane.showMessageDialog(null, "Invalid data");
           }

           return valid;
       }
    }

InputVerifier verifier = new MyNumericVerifier()
comboBox.setInputVerifier(verifier);

+1 You can provide feedback in `shouldYieldFocus()`, for [example](http://stackoverflow.com/a/13510756/230513). — trashgod, Nov 24 '12 at 18:03

score 6 · Accepted Answer · answered Nov 24 '12 at 17:44

6

If "validation" means "check all the fields" ... then, yes - your "validate" routine will check all the fields one-by-one :)

You can also "validate-as-you-go". There are many ways to accomplish this, including:

answered Nov 24 '12 at 17:44

paulsm4

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I think Kenai Validation API is useful. Thanks everyone. – Chinthaka Manathunga Dec 04 '12 at 09:00

score 2 · Answer 3 · answered Nov 24 '12 at 17:46

2

There are some third party api's available. You can develop your own for

Required field,
Email Validation,
Max & Min length, etc.,

Here is a sample tutorial for Building a Swing Validation Package with InputVerifier

answered Nov 24 '12 at 17:46

vels4j

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1

See also this `JTable` related [example](http://stackoverflow.com/a/13510756/230513). – trashgod Nov 24 '12 at 17:55

score 1 · Answer 4 · answered Nov 24 '12 at 17:42

That's not possible. Instead you will have to create a new class that inherits the JTextField and then have a validate() function as private or protected, and call that everytime you getText() (which means you'll have to @Override it)from it.

An alternate is to use Container.getComponent() and check for instanceof and then validate each field separately. This however is against what you're asking for.

Validate all fields in Swing GUI

4 Answers4