# Input Text box

**URL:** <https://forum.kirupa.com/t/input-text-box/74868>\
**Category:** flash\
**Created:** [January 3, 2005, 3:21pm UTC](https://forum.kirupa.com/t/input-text-box/74868 "2005-01-03T15:21:54Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![apple](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@apple](https://forum.kirupa.com/u/apple)\
**Post date:** [January 3, 2005, 3:21pm UTC](https://forum.kirupa.com/t/input-text-box/74868/1 "2005-01-03T15:21:54Z")

</div>

Let’s say I have four input text boxes and a button “Start”, and I want this button to be actived only when user has key in the data into the three compulsory text boxes. The remaining one is optional.

So, what can be done and how? Hope someone could help me.

Thanks.