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POActionscript3: Does variable exist?
 

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    <p>I'm a little bit new to Actionscript, but I can't figure this one out. I've done a lot of searching on this topic and haven't found a clear answer. I've tried the following solutions that people posted online but none of them work.</p> <p>All the following <em>solutions</em> give the error: <em>1120: Access of undefined property myVariable</em></p> <p><strong>Suggestion #1:</strong></p> <pre><code>try { trace(myVariable); } catch { trace("your variable doesn't exist"); } </code></pre> <p><strong>Suggestion #2:</strong></p> <pre><code>if (myVariable) { trace("your variable exists!!"); } else { trace("it doesn't exist"); } </code></pre> <p><strong>Suggestion #3:</strong></p> <pre><code>if ( myVariable == null ) trace("your variable doesn't exist"); </code></pre> <p><strong>Suggestion #4:</strong></p> <pre><code>if ( myVariable == undefined ) trace("your variable doesn't exist"); </code></pre> <p>Like I said, I've found many forums posts and stuff online that give the above suggestions saying they will work, but they all seem to be giving me that same <em>1120: Access of undefined property myVariable</em> error.</p> <p>By the way, in case you are wondering why I would need to check if a variable exists or not, I'm planning on passing variables to the SWF in its URL, so I need to make sure the proper variables exist and handle the code properly if they are not passed in.</p> <hr> <p>Thanks for the quick reply. Still not really working. The scope of the variable is just on the top/root level of the script. Basically, I start a new flash file, on the first frame I add the following action:</p> <pre><code>// to check for this.myVariable if ( this.hasOwnProperty( "myVariable" ) ) { trace("myVariable exists"); } else { //Variable doesn't exist, so declare it now trace("declaring variable now..."); var myVariable = "Default Value"; } trace(myVariable); </code></pre> <p>When I run the flash file, I get this output:</p> <pre><code>myVariable exists undefined </code></pre> <p>I was expecting this:</p> <pre><code>declaring variable now... Default Value </code></pre>
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