# addEventListener to a Variable

**URL:** <https://forum.kirupa.com/t/addeventlistener-to-a-variable/287008>\
**Category:** flash\
**Created:** [April 24, 2009, 2:33pm UTC](https://forum.kirupa.com/t/addeventlistener-to-a-variable/287008 "2009-04-24T14:33:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ruiganga](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/ruiganga/32/3679_2.png) [@ruiganga](https://forum.kirupa.com/u/ruiganga)\
**Post date:** [April 24, 2009, 2:33pm UTC](https://forum.kirupa.com/t/addeventlistener-to-a-variable/287008/1 "2009-04-24T14:33:15Z")

</div>

Hi

I have a variable

var pageState:uint = 0;

The only values of that variable will be 0 (ZERO) and 1 (ONE).

I need to set a kind of Event Listener. Each time the variable changes:

if (pageState == 0){  
x = 10;  
}else{  
x = 0;  
}

How can I set an addEventListener to this?

Thanks