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Validating a TextField in an Applet

Posted on 2002-03-21
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Last Modified: 2010-05-18
Hi everyone!
This is an easy question:
How can I validate a TextField to be sure that it contains only numbers? If it has something else I want to Open a Message Box informing the problem and return the focus to it.
This must be done in an Applet.

Thanks for any help in Advance!

Regards,
MRXZ
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Question by:mrxz
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Expert Comment

by:CEHJ
ID: 6886232
Add a KeyListener to the TextField and disallow anything that's not part of a number
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Expert Comment

by:bobbit31
ID: 6886293
> Add a KeyListener to the TextField and disallow anything that's not part of a number

they'll still be able to paste text into the textbox... to be sure, you can check the contents when they submit (click the button or whatever)

try {
   int textVal;
   textVal = Integer.parseInt("<text in textbox>");
} catch (NumberFormatException nfe) {
   // not an int so do what you need to do
}
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LVL 86

Expert Comment

by:CEHJ
ID: 6886303
That's true bobbit31!
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Accepted Solution

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Calron earned 30 total points
ID: 6894111
The way to solve this is to write a Document for the textfield. The concept is explained nicely in the java tutorial:

http://java.sun.com/docs/books/tutorial/uiswing/components/textfield.html#validation

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