As this question observes, immediate CSS transitions on newly-appended elements are somehow ignored - the end state of the transition is rendered immediately.
For example, given this CSS (prefixes omitted here):
.box {
opacity: 0;
transition: all 2s;
background-color: red;
height: 100px;
width: 100px;
}
.box.in { opacity: 1; }
The opacity of this element will be set immediately to 1:
// Does not animate
var $a = $('<div>')
.addClass('box a')
.appendTo('#wrapper');
$a.addClass('in');
I have seen several ways of triggering the transition to get the expected behaviour:
// Does animate
var $b = $('<div>')
.addClass('box b')
.appendTo('#wrapper');
setTimeout(function() {
$('.b').addClass('in');
},0);
// Does animate
var $c = $('<div>')
.addClass('box c')
.appendTo('#wrapper');
$c[0]. offsetWidth = $c[0].offsetWidth
$c.addClass('in');
// Does animate
var $d = $('<div>')
.addClass('box d')
.appendTo('#wrapper');
$d.focus().addClass('in');
The same methods apply to vanilla JS DOM manipulation - this is not jQuery-specific behaviour.
Edit - I am using Chrome 35.
JSFiddle (includes vanilla JS example).
- Why are immediate CSS animations on appended elements ignored?
- How and why do these methods work?
- Are there other ways of doing it
- Which, if any, is the preferred solution?