May 13, 2009 · Not defined - a variable is not even declared. The only safe way to check for both cases is use typeof myVar === 'undefined' myVar === undefined will only check for case …

That error means that jQuery has not yet loaded on the page. Using $(document).ready(...) or any variant thereof will do no good, as $ is the jQuery function. Using window.onload should work …

Why do I sometimes get the error 'myFunction is not defined' when it is defined? For example. I'll occasionally get 'copyArray is not defined' even in this example: var la = []; for (var i=0; i < …

Jan 27, 2025 · The JavaScript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere.

Mar 9, 2021 · Sometimes, you may come across JavaScript function is not defined error that looks like the following: The ReferenceError as in the case above is caused when you call …

May 22, 2023 · This JavaScript exception variable is not defined and occurs if there is a non-existent variable that is referenced somewhere. Message: ReferenceError: "x" is not defined. …

Jan 15, 2025 · Learn how to fix ReferenceError: variable is not defined in JavaScript. Understand common causes like undeclared variables, scope issues, and hoisting, and discover practical …

Mar 13, 2022 · With a little investigation and debugging, you should be able to find the root cause in no time. The most obvious—and, ironically, the most common—cause for the function not …

Jan 29, 2024 · If the function $ is not defined, it means that the JavaScript engine doesn't have a reference to the jQuery library, which defines $. This is often because the library hasn't been …

Jul 8, 2023 · NOT DEFINED: In JavaScript, “not defined” refers to a reference error that occurs when attempting to access variables or identifiers that are not declared or do not exist within …