Javascript – How to apply !important using .css()

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I am having trouble applying a style that is !important. I’ve tried:

$("#elem").css("width", "100px !important");

This does nothing; no width style whatsoever is applied. Is there a jQuery-ish way of applying such a style without having to overwrite cssText (which would mean I’d need to parse it first, etc.)?

Edit: I should add that I have a stylesheet with an !important style that I am trying to override with an !important style inline, so using .width() and the like does not work since it gets overridden by my external !important style.

Also, the value that will override the previous value is computed, so I cannot simply create another external style.

Best Answer

The problem is caused by jQuery not understanding the !important attribute, and as such fails to apply the rule.

You might be able to work around that problem, and apply the rule by referring to it, via addClass():

.importantRule { width: 100px !important; }

$('#elem').addClass('importantRule');

Or by using attr():

$('#elem').attr('style', 'width: 100px !important');

The latter approach would unset any previously set in-line style rules, though. So use with care.

Of course, there's a good argument that @Nick Craver's method is easier/wiser.

The above, attr() approach modified slightly to preserve the original style string/properties, and modified as suggested by falko in a comment:

$('#elem').attr('style', function(i,s) { return (s || '') + 'width: 100px !important;' });

Related Solutions

Html – How to horizontally center an element

You can apply this CSS to the inner <div>:

#inner {
  width: 50%;
  margin: 0 auto;
}

Of course, you don't have to set the width to 50%. Any width less than the containing <div> will work. The margin: 0 auto is what does the actual centering.

If you are targeting Internet Explorer 8 (and later), it might be better to have this instead:

#inner {
  display: table;
  margin: 0 auto;
}

It will make the inner element center horizontally and it works without setting a specific width.

Working example here:

#inner {
  display: table;
  margin: 0 auto;
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%
}

<div id="outer">
  <div id="inner">Foo foo</div>
</div>

EDIT

With flexbox it is very easy to style the div horizontally and vertically centered.

#inner {  
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%;
  display: flex;
  justify-content: center;
}

<div id="outer">
  <div id="inner">Foo foo</div>
</div>

To align the div vertically centered, use the property align-items: center.

Javascript – How to check if an element is hidden in jQuery

Since the question refers to a single element, this code might be more suitable:

// Checks CSS content for display:[none|block], ignores visibility:[true|false]
$(element).is(":visible");

// The same works with hidden
$(element).is(":hidden");

It is the same as twernt's suggestion, but applied to a single element; and it matches the algorithm recommended in the jQuery FAQ.

We use jQuery's is() to check the selected element with another element, selector or any jQuery object. This method traverses along the DOM elements to find a match, which satisfies the passed parameter. It will return true if there is a match, otherwise return false.

Best Answer

Related Solutions

Html – How to horizontally center an element

EDIT

Javascript – How to check if an element is hidden in jQuery

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