Cancel Key press event

Posted by Asim Sajjad on Stack Overflow See other posts from Stack Overflow or by Asim Sajjad
Published on 2010-04-07T09:27:10Z Indexed on 2010/04/07 9:33 UTC
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How can I return the key, mean if I want to allow only interger value in the textbox , how can I don't allow user to not enter value other then integer, regarding, keypress event, I know there are other ways such as expression to match the string value, but I want to not assign invalid value to the textbox.

if (( value >0 a&&(value <=9)) then assigned else return

thanks in advance

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