CSS transition not working for percentage height?

Question

I have the following CSS definitions:

.detailsCollapsed
{
   display:none;
   height:0%;
   width:100%;
   -webkit-transition:height 40s ease-in-out;
}

.detailsExpanded
{
    display:block;
    visibility:visible;
    height:100%;
    width:100%;
    -webkit-transition:height 40s ease-in-out;
}

These are applied to a div with some content inside of it.

I also have some javascript that when a div is clicked it changes the class name on the element. This works fine for expanding and collapsing but there is no animation on the iphone? (All other transitions I tried work fine with fluid animation) Any ideas?

user_559976 · Answer

i had the same issue. Transition worked fine when "collapsing", but appeared with no transition (like being "switched on") on "expanding", when "display:none" was set before.

I accidentally came to a working solution while debugging: simply querying the "offsetHeight" seems to force an internal re-render of the element.

something like this:

    showElement = function(){
       ...
       oEl.style.display = "block";
       var xDump = oEl.offsetHeight;
       oEl.className = "show";
    }

xDump is never used, but having it, made the differnce.

user_562077 · Answer

I've used the following solution for elements where i need to toggle between display none and block, and keep the transition effect:

function slidedown(element) {
    ...
    element.style.display = "block";
    var timerId = setTimeout(function(){
        element.style.webkitTransitionProperty = "height";
        element.style.webkitTransitionTiming = "linear";
        element.style.webkitTransitionDuration = "3.5s";
        element.style.height = "500px";
    }, 0);
    ...
}

the setTimeout function will force a short delay allowing the transition to occur after toggling the display property. Hope it helps.

user_1463854 · Answer

CSS solution without need to calculate max-height

Here's my solution if the total height is not known

.container{
  
  overflow:hidden;
  max-height:20px;
  transition-property: max-height;
  -webkit-transition-property: max-height;
  transition-delay: 1s; /*Set a delay for this css-propery so content also slides up*/
  -webkit-transition-delay: 1s;
}
.container .content{
  z-index:5;
  background-color:LightGray;
  
  margin-top:20px;
  transform:translateY(-100%);
  -webkit-transform:translateY(-100%);
  transition:transform 1s;
  -webkit-transition:transform 1s;
}
.container:hover{
  max-height:9999px; /*apparently "none" doesnt work*/
  transition-delay: 0s;
  -webkit-transition-delay: 0s;
}
.container:hover .content{
  
  transform:translateY(0);
  -webkit-transform:translateY(0);
}

/*Less interesting stuff below*/
body{
  background-color:navy;
}
div,label{
  margin:0;
  padding:0;
}
.container label{ /*Just a label to describe what you can do here*/
  height:20px;
  line-height:20px;
  display:block;
  z-index:10;
  position:absolute;
  background-color:maroon;
  width:100%;  
}




Hover container


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Working example

user_11747569 · Answer

There is no absolute solution to this issue.The desired result can be achieved through various workarounds. The browsers currently doesn’t support this since this involves transitioning an element into a height of auto, for which the browser would have to perform a reflow for every stage of that animation, which is not simple and expensive on performance side.

solution 1: max-height (ideal solution)

.slideup, .slidedown {
  height: auto;
  max-height: 0px;            
  overflow-y: hidden;
  transition: max-height 300ms ease-in-out;
}

.slidedown {            
  max-height: 500px;                    
}

solution 2: transform : scaleY()

.slideup .slidedown {
  overflow:hidden;
  transition:transform 0.3s ease-out; 
  transform, not height!
  height:auto;
  transform:scaleY(1);
}

.slideup  {
  transform:scaleY(0); //collapse the view
}

CSS transition not working for percentage height?

9 Answers

CSS solution without need to calculate max-height