# \[FMX\] check variable existence

**URL:** <https://forum.kirupa.com/t/fmx-check-variable-existence/156390>\
**Category:** flash\
**Created:** [July 25, 2005, 3:20pm UTC](https://forum.kirupa.com/t/fmx-check-variable-existence/156390 "2005-07-25T15:20:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![k\_mark](https://avatars.discourse-cdn.com/v4/letter/k/ed8c4c/32.png) [@k\_mark](https://forum.kirupa.com/u/k_mark)\
**Post date:** [July 25, 2005, 3:20pm UTC](https://forum.kirupa.com/t/fmx-check-variable-existence/156390/1 "2005-07-25T15:20:23Z")

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Hi,

I have a frame where there a 5 input text fields that the user can fill in. THey may not fill them all in though. In the next frame I want to push the fields that they filled in into an array. My questions is how do I determine what they filled in and what they didn’t. Is there something like a if(isset(variable)){ do this } in Flash

I hope this makes sense.  
-Mark