Set DocumentFilter on JOptionPane

Question

I'm using:

String s = JOptionPane.showInputDialog(...);

to get a response back from the user to a question; the dialog is set up to display a text field for the response. I'd like to limit the characters allowed in the response to alphanumeric and '_' only. Is it possible to install a DocumentFilter on the text field without implementing my own custom dialog from scratch?

Possible duplicate: http://stackoverflow.com/questions/4684914/filter-the-users-keyboard-input-into-jtextfield-swing — Boris Pavlović, Feb 11 '13 at 14:49

Sergiy Medvynskyy · Answer 1 · 2013-02-11T16:05:55.460

Access the autocreated text field of JOptionPane is theoretically possible, but it's IMHO wrong way.

Here is the better solution: JOptionPane has a hidden feature: it accepts also Swing components as messages. So you need to create a panel with lable and text field (with your DocumentFilter) and pass it to a confirm dialog. After confirmation you can read the text from your text field.

Here is sample:

JPanel p = new JPanel(new FlowLayout());
JTextField fld = new JTextField(10);
// set document filter for 'fld' here
p.add(new JLabel("Enter text: "));
p.add(fld);
int val = JOptionPane.showConfirmDialog(null, p, "Test", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null);
if (JOptionPane.OK_OPTION == val) {
  System.out.println("Text: "  + fld.getText());
}

I don't know about hidden, as I'm pretty sure it's in the docs, most people just seem to miss it ;)...+1 — MadProgrammer, Feb 11 '13 at 19:58

score 2 · Answer 2 · answered Feb 11 '13 at 15:55

2

Not sure how to add a DocumentFilter to the text field document directly.

See Stopping Automatic Dialog Closing for a different approach.

answered Feb 11 '13 at 15:55

camickr

321,443
19
166
288

Set DocumentFilter on JOptionPane

2 Answers2

Linked