Input rules on a TJext area

[Bravogolf]

Hi all.

I want users to be able to enter numbers (only) into a text box (JText) and an action to be taken for when the user presses enter.

I.e. enters 3543 and presses enter, will implement a method.

I could do this in VB or HTML, but not in Java (am new). Can anyone help?

 

[quarryknight]

Here's a couple of ideas:

1. The String class has a method called matches() which takes a RegExp value to validate its type. If you know RegExp, or look on the web for RegExps for validating numbers, you could find the expression you want and use it to validate your code.

2. The Integer class has a method called getInteger() which takes a String as its argument. If the String cannot be converted into an integer, the method returns null. Otherwise, it returns an Integer object. While this might work, you'd have to keep negative numbers in account for what you want to do.

Personally, I think (1) would probably be the best choice.

Hope this helps.

Nick Ruiz

http://www.DealMerchant.net

Webmaster, DBA

 

[new2this2002]

what about the JFormattedTextField class... you can read more here

http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html

i think it may do what you are after

 

[Bravogolf]

Great, thanks lads. Both where very helpful