What is the best way to make an element's width match the width of the window?

When using the following code:

 $(my_div).width(window.innerWidth)

The expected result is not achieved, as it does not take into account the vertical scrollbar. This causes the element to overflow the window, resulting in a horizontal scrollbar, which can be seen in the illustration below.

View Illustration Here: http://dl.dropboxusercontent.com/u/62862049/Screenshots/om.png

Answer №1

To make it fill the whole width, you can apply width:100%

<div style="width:100%;height:1500px;background:red"></div>

Check out the demo here!

Answer №2

Did you know that window.innerWidth may or may not include the width of the vertical scrollbar in certain versions of Firefox? To learn more about this, check out the following resources:

Mozilla Developer Network

Interestingly, there is some disagreement on whether the scrollbar width is included in window.innerWidth, as mentioned by W3Schools.

If you're interested in diving deeper into this topic, you can also explore the related bug reported in the Mozilla bug tracker: Mozilla Bug Tracker

To address this confusion, CSS3 introduces a specific property called box-sizing, which helps in calculating widths accurately. By setting box-sizing to 'border-box', you can ensure that padding and border are included within the specified width and height parameters.

For those using jQuery to retrieve window width, consider utilizing jQuery's width() method for accurate measurements.

Answer №3

Is it possible to utilize

$(my_div).updateCss('width', '100%');

instead?

Answer №4

$(my_div).css("width", "100%");

Alternatively, you can achieve the same effect by using this CSS:

#my_div {
  width: 100%;
}

It's also important to ensure that there is no padding or margin on your body or parent div:

body {
  padding: 0;
  margin: 0;
}

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