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Editorial Team
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Asked: 2026-05-27T10:55:04+00:00

Is there a default value assigned to an element when var thisvar = $(this).data(somekey);

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Is there a default value assigned to an element when

var thisvar = $(this).data("somekey");

is called?

Sometimes I get “undefined” or “on” when I run

alert(thisvar);

Shouldn’t the return value always be undefined?

Thank you!

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1 Answer

  1. Editorial Team

    jQuery.data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore free from memory leaks. jQuery ensures that the data is removed when DOM elements are removed via jQuery methods, and when the user leaves the page.

    Use proper system for jQuery data() function like this

    jQuery.data( element, key )
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