Web Reference: I have a JavaScript function which fires on blur. Strangely enough it worked fine the first time I ran it, and ever since then I've been getting an error that says JavaScript Function Not Defined - and it stops running. Jul 9, 2025 · There are a number of things that can go wrong with functions. One of the most common errors is to declare the function, but not call it anywhere. For example: function myFunction() { alert("This is my function."); This code won't do anything unless you call it with the following statement: Feb 3, 2024 · So far, we’ve covered some common scenarios across different JavaScript frameworks that could lead to the “function is not defined” error. Each framework has its quirks, but the underlying issue remains the same: the JavaScript engine doesn’t know about the function at the time it’s being called.
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