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How would you check to see if a JavaScript variable is defined? I wrote a JavaScript program that works for the most part. Unfortunately, one of the features of the program is not responding correctly. I'm thinking that one of the variables is not defined and was wondering if anyone knew of any methods to check to see if this is the case.
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Last time I needed to check something similar with JSON and JS, I just viewed the source of the page and I could see what was created and what wasn't....You may have already tried this...but it helped me out..

In javascript you can use the typeof() function on your variable.
e.g.

Code: Select all

if ( typeof(myvar) == 'undefined' )  // then it is undefined