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Asked: 2026-05-15T11:45:12+00:00

This seems really simple, but how do I call a javascript function that’s defined

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This seems really simple, but how do I call a javascript function that’s defined in the top-level html, from a child frame?

top html doc
 - 1st level frame
    - 2nd level frame

my top html doc has a function called testFn(). In the 2nd level frame I have a button with onclick="top.testFn();" but this doesn’t call the testFn(). In Firebug if I use a watch to execute top.testFn(); it says TypeError: testFn() is not a function.

Should this all just work – in which case it’s a problem with my documents, or is there some other way to call functions in the top-level window?

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1 Answer

  1. Editorial Team

    Your code looks right. If it says testFn() is not a function then perhaps it isn’t. Have you tried setting onload="testFn();" in the <BODY> of your top frame to make sure that works?

    There could be some javascript error which leads to the code creating your testFn function not being successfully completed.

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