Published on: 31 March, 2016

How to check if a function in windows parent exists in Javascript

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When ever you try to reference a function from parent window, always perform a check if the function itself is exist. This will ensure there is no javascript error that can cause problem loading your site content or may cause a conflict with another javascript code.

To check if a function exists in the windows parent, you can use the following code.

if (typeof parent.functionName === "function") {
	//if exists perform your code here.
}
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