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javascriptflashswfobjectexternalinterface

Check if Flash object has method from within JavaScript

I am calling an ActionScript object method from within a JavaScript function, however I can't be sure the flash object has that particular method. If the flash object does not supply the method in question I end up with an Error calling method on NPObject!.

How can I check whether the flash object supplies the method in question? I tried to wrap it in a type check like this:

if(typeof flashObj.myfunction() === 'function') {
    //do it
}

But I still end up with:

Error calling method on NPObject!
if(typeof flashObj.myfunction() === 'function') { 
…

Thank you!

Solution

  • You are actually calling the function in your comparison.

    Instead of this:

    if(typeof flashObj.myfunction() === 'function') {
    //do it
}

    use this:

    if(typeof flashObj.myfunction === 'function') {
    //do it
}