mobile - How to get same effect as jQuery's slideToggle using CSS 3 transitions?

Question

I want the jQuery slideToggle effect but want to use CSS3 transitions in order to invoke the GPU on an iOS device so the transition is smoother.

Answer 1

You can achieve this by transitioning height, padding's and border-width. Here is an example:

$('.run-css').click(function() {
    $('.cont').toggleClass('toggled');
});

.cont {
    width: 100px;
    height: 100px;
    border: 1px #CCC solid;
    background-color: #EEE;
    padding: 5px;
    -webkit-transition: height .3s linear, padding-top .3s linear, padding-bottom .3s linear, border-top-width .3s linear, border-top-width .3s linear;
    transition: height .3s linear, padding-top .3s linear, padding-bottom .3s linear, border-top-width .3s linear, border-top-width .3s linear;
}
.toggled {
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    height: 0;
    border-width: 0 1px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script>
<button class="run-css">CSS slideToggle</button>

<div class="cont">Toggle this div</div>