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 · The JavaScript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere. Jan 16, 2026 · This error typically stems from misunderstandings about JavaScript scope, inline event handlers, or improper function placement. In this blog, we’ll demystify why this error occurs, break down common causes, and provide step-by-step solutions to fix it.
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