Atadj Atadj - 1 year ago 81
CSS Question

jQuery window width not equal to CSS's window width

I'm using the following two pieces of CSS and JS code:

@media (max-width: 720px) {
// a code to make arrows in a carousel disappear

if(jQuery(window).width() <= 720){
// a code to make arrows in the carousel stop working

The problem with them is that the latter executes on exactly width=738px and not 720px. I suspect that this is because of browser's vertical scrollbar that has width equal to 18px in Chrome.

Is there a way to unify this? I'd like these actions to happen at the same moment in all browsers regardless of the scrollbar's width.

Tests (when browser is @ 720px and CSS has already executed):

jQuery(document).innerWidth() = 703
jQuery(window).innerWidth() = 703
jQuery(document).width() = 703
jQuery(window).width() = 703
jQuery('body').width() = 703
jQuery('html').width() = 703

Answer Source

I had to tackle the same problem a while ago, and so far the most correct solution I found is to use media queries to pass the actual window size to Javascript. You have to follow these steps:

  • Add a hidden element to your page,
  • Use media queries to alter the max-width property of that element,
  • Read back the max-width property of that element through Javascript.

For instance, add the following element to your page:

<div id="currentMedia"></div>

Then write the following CSS rules:

#currentMedia {
    display: none;

@media (max-width: 720px) {
    /* Make arrows in the carousel disappear... */

    #currentMedia {
        max-width: 720px;

Then, from the Javascript side, you can write:

if (parseInt(jQuery("#currentMedia").css("max-width"), 10) <= 720) {
    // Make arrows in the carousel stop working...

And it will be accurate regardless of the scrollbar size, since the value comes from the same media query that triggers the carousel's disappearance.

I tested this solution on all major recent browsers, and it gives correct results.

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