How Can I Determine if an Element\'s Width is Defined in Pixels or Percentages Using jQuery?

Determining Element Width: Percentage or Pixels?

When developing web applications, it's essential to accurately measure the dimensions of elements on the page. jQuery's width() and css('width') methods can provide this information, but they typically return the exact pixel value. However, developers often specify widths as percentages in CSS.

Challenge:

One challenge arises when a jQuery plugin needs to determine the width of an element based on the developer's CSS specifications. Using the aforementioned methods, it's impossible to distinguish whether a width is defined in pixels or percentages.

Solution:

To address this, we can calculate the width ourselves using the following approach:

1. Get the element's width using $('#someElt').width() and store it in the 'width' variable.
2. Then, determine the parent element's width using $('#someElt').offsetParent().width() and store it in the 'parentWidth' variable.
3. Finally, calculate the percentage by dividing the element's width by the parent's width and multiplying the result by 100: var percent = 100*width/parentWidth;.

This approach accurately returns the element's width in percentages or pixels, depending on the CSS specification.

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