How to accurately determine the width of an element using JavaScript

Consider this scenario where I have created a custom dropdown list using HTML within a generic div:

$(document).ready(function() {
    $("#selectbox-body").css("width", $("#selectbox").width());
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

<div id="outer-div">
<label style="float: left; width: 100px; background-color: blue">LABEL</label>
<div id="selectbox" style="background-color: pink">......</div>
<div id="selectbox-body" style="position: absolute; height: 100px; background-color: red">12312313</div>
</div>

Find more information on http://jsfiddle.net/sdkpkLds/.

The issue arises when #selectbox.width is equal to the width of #outer-div, and not #outer-div minus label.width. How can we position #selectbox-body so that it does not appear under label?

Answer №1

If you want the accurate dimensions that are currently being calculated, you have two choices:

  1. Use getComputedStyle(element,null).getPropertyValue("width")
  2. Access element.getBoundingClientRect().width

The first option will give you a CSS string with a (px) unit, while the second will provide you with a number.

It's important to understand that inquiring about the supposed CSS rule will only give you information based on what the stylesheet or inline style dictates, which may differ from the actual computed current dimensions.

Furthermore, keep in mind that getComputedStyle is a global function. In older tutorials, it might suggest using

document.getDefaultView.getComputedStyle
or similar syntax, but this is no longer necessary.

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