# Input field validation

**URL:** <https://forum.kirupa.com/t/input-field-validation/127434>\
**Category:** Uncategorized\
**Created:** [November 2, 2004, 11:35pm UTC](https://forum.kirupa.com/t/input-field-validation/127434 "2004-11-02T23:35:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chris71](https://avatars.discourse-cdn.com/v4/letter/c/e56c9b/32.png) [@chris71](https://forum.kirupa.com/u/chris71)\
**Post date:** [November 2, 2004, 11:35pm UTC](https://forum.kirupa.com/t/input-field-validation/127434/1 "2004-11-02T23:35:41Z")

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Hi,

I want create an input text field can only input EVEN numbers and do nothing when input other characters.

What codes I’ve to put in the button?

Help please.

Chris