How Can I Efficiently Get the Height of an Element Inside a Hidden Div Using jQuery?

Retrieving Height of Hidden Elements in jQuery

Obtaining the height of an element concealed within a hidden div can be challenging. The conventional method involves displaying the div, retrieving the height, and then hiding it, which can be cumbersome.

However, there is a more efficient approach that leverages jQuery's ability to modify CSS styles:

Approach

1. Modify CSS: Temporarily set the following CSS properties for the hidden div:

   • position: absolute (optional if the div is already absolute)
   • visibility: hidden
   • display: block
2. Get Height: Using jQuery's height() function, retrieve the height of the element within the now-visible div.
3. Restore CSS: Once the height is obtained, restore the original CSS properties of the div.

Code Example

var previousCss = $("#myDiv").attr("style");

$("#myDiv").css({
    position:   'absolute', // Optional if #myDiv is already absolute
    visibility: 'hidden',
    display:    'block'
});

optionHeight = $("#myDiv").height();

$("#myDiv").attr("style", previousCss ? previousCss : "");

This approach provides a more efficient and flexible way to obtain the height of hidden elements, without having to repeatedly show and hide the parent div.

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