Web Reference: Jan 16, 2026 · In this guide, we’ll demystify why your `onclick` event might fail and walk through step-by-step solutions to fix it. Whether you’re a beginner or an experienced developer, understanding these common pitfalls will save you hours of debugging. 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. Jan 16, 2026 · In this guide, we’ll demystify the X is not a function error, explore why custom objects like SCORM_API_12 are prone to it, and walk through a step-by-step troubleshooting process with real-world examples. By the end, you’ll be equipped to diagnose and fix this error in your own projects.
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