Javascript Syntax

[ScottYardley]

I have been beating my head on this for a couple days now.

I need to check if an array is defined.
Also, the array name to be check has to be dynamic

This is kinda what I had in mind:

if(eval('var_'+x))
alert(msg);

I can do it in php :)

if(isset(${'var_'.$x})
echo $msg;

[orion_rus]

i think eval alway's return true
may be u try isNan?

[Bernard Marx]

If it's a global var,
(any code that checks for local var definition in a script should result in a brain test)
this is easiest:

if(window.varName)

You'll want:

if(window['var_'+x])

For 100% safety (will return false if value is [0,'',false,undefined])
Use

if(typeof window['var_'+x]!= 'undefined')

..but an array will always evaluate true, so use the shorter version.

[ScottYardley]

Bernard Marx,

Excellent! works great.
Where to I go to sign up for your fan club.

[Bernard Marx]

Next left; down the narrow staircase; third door after the fire exit.