Web Reference: In my experience this error occurred because there was another error previous to the Function is not defined - uncaught referenceerror. So, look through the console to see if a previous error exists and if so, correct any that exist. Jul 8, 2025 · Put the element that loads the library before your code that uses it. The "foo" variable isn't defined anywhere. It needs to be some string, so that the String.prototype.substring() method will work. A variable needs to be available in the current context of execution. Jan 16, 2026 · The Uncaught ReferenceError: Function is Not Defined inside $(document).ready() is almost always a scope issue. By understanding that $(document).ready() creates a local scope, avoiding inline event handlers, and properly declaring functions, you can easily fix and prevent this error.
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