Eval question

[shmmeee]

I'm using eval on a users input to turn it into a variable. However if the user enters something that isn't a variable then an error occurs (No such variable or something similar) is there a way to check for this to aviod the error? I have been using

window.onerror

but there are reasons that I would rather not also if I have to use

onerror

does it switch itself off again after the script has stopped running or do I have to do some tidying up.

Thanks in advance s-)

 

[katun]

This code snippit should get you close.

<script language=&quot;JavaScript&quot;>
if(typeof x == &quot;undefined&quot
{
alert('Not a Variable');
}
</script>

Bill Guttman - katun@mindspring.com
Great JavaScript tips at

http://www.katungroup.com/javascript.htm

 

[shmmeee]

Sorry, is x the string the user has inputted or eval(user_string)?

I've tried both and still can't get it to work