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Transition Effects 1 and activation code


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By Louis Lazaris on September 1st, 2011 |

At the beginning of this month I wrote a post accompanied by five demo pages that showed that CSS3 transitions could be triggered with a number of different events/states in CSS.

That alone should help you see how these types of simple animations work. But let’s take this a bit further.

CSS pseudo-classes and media queries (which I used in that other post to trigger the transitions) represent certain states for certain elements. These states occur after specific events on the page. So naturally, CSS3 transitions can also be fired using any JavaScript event. Let’s try a simple click event that toggles a class name.

Here’s the HTML:

<div class="box"></div> <input type="button" value="Let's Do This Thing" id="bt">

So we have a box with a class of “box”, and a button. Let’s add the following jQuery:

$(function() { $("#bt").click(function() { $(".box").toggleClass("box-change"); }); });

This uses jQuery’s .toggleClass method to add or remove the specified class name. So let’s add the CSS:

.box { width: 300px; height: 300px; -webkit-transition: width 2s ease, height 2s ease; -moz-transition: width 2s ease, height 2s ease; -o-transition: width 2s ease, height 2s ease; transition: width 2s ease, height 2s ease; } .box-change { width: 400px; height: 400px; }

The transitions are declared on the .box element (using all the necessary vendor prefixes), and they include the use of multiple transitions separated by a comma (in this case transitioning both width and height).

So when the button is clicked, after the .box-change class is added, this will trigger the transition.

It’s very similar to what you’d normally do with :hover, or :checked, or media queries, or whatever. But in this case the solution involves JavaScript. Here’s a demo page that shows this simple technique:

Why Would You Do This?

Well, there could be a number of reasons. Maybe you’re using JavaScript in your web page or web app to trigger something, so instead of using jQuery to animate CSS properties, you can leave the simple animations in your CSS, and avoid having those cluttering your scripting. Of course, some people feel animation belongs in JavaScript, not CSS. But for simple animations, I’m starting to agree with what seems to be the majority view — that CSS is the right place for these.

You could also use Modernizr and do something like this:

$(function() { $("#bt").click(function() { if (Modernizr.csstransitions) { $(".box").toggleClass("box-change"); } else { // do some jQuery-based animations/transitions here // for IE 6-9 } }); });

So with this code, you’re using Modernizr to detect whether the browser supports transtions, then only trigger them if they are present.

For Simple Animations

If you’re using more complex animations, then you might have to use keyframe-based animations combined with scripting. But for simple fades and slides, you might be able to use JavaScript combined with CSS3 transitions and fork some jQuery for browsers that don’t support them.

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