How Can I Get an Element\'s Width in jQuery, Even If Defined as a Percentage?

Determining Element Width in jQuery: Percentage vs Pixels

In the realm of web development, it's often necessary to determine the width of an element. However, jQuery's .width() or .css('width') methods typically return the exact pixel width, even if the developer has defined it using a percentage value in CSS.

Determining Width Based on CSS Definition

To address this issue, one needs to compute the width oneself. The following steps demonstrate how:

1. Retrieve the element's width using .width(): var width = $('#someElt').width();
2. Obtain the width of the element's parent: var parentWidth = $('#someElt').offsetParent().width();
3. Calculate the percentage width: var percent = 100 * width / parentWidth;

By following these steps, you can accurately determine the width of an element in either pixels or percentage, depending on its CSS definition. This knowledge proves invaluable for developing jQuery plugins or performing various layout computations.

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