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Possible to animate dynamic height using CSS? JS alternatives accepted

I'm using AngularJS which allows me to use ng-show and ng-hide to show and hide elements based on a logical condition. What I'm trying to accomplish is to animate the size changes of the container when the children objects are shown-hidden so it's less jumpy.
For those not familiar with AngularJS, ng-show and ng-hide basically just applied the display: none and display: block properties. So when a container is set to show the display is set to block.
With that out of the way, I've been reading on animating height changes through a few pages of google searches and all I can find are examples using max-height to animate it from one height to another, which are statically defined by CSS rules, for example:
#animated-div {
max-height: 100px;
transition: max-height 1s ease;
}
#animated-div.hidden {
max-height: 0px;
}
and they would remove the .hidden class to cause the transition to animate the change in height.
The issue is that I'm not opening/closing a container and there's no pre-determined height that the container will be, as the container can be modified dynamically based on a variety of variables. On-top of that the application is responsive, so the height will vary across devices.
Here is an example scenario:
- Container
- Div A (Height: 200px); Shown
- Div B (Height: 100px); Shown
- Div C (Height: 300px); Hidden
- Div Slider (Height: Dynamic) Hidden.
Currently the height of the container (which is auto) is 300px based on the children, now the user toggles Div C active, which increases the height to 600px The div should animate the expansion from 300px -> 600px now the user clicked the clear button, the children of the container are all hidden, the container should animate from 600px -> 0px.
The user then starts messing with a slider, which value ranges from 0 to 100. This height is applied to the Div Slider. Say the user slides to 57. This should cause an animation from 0px -> 57px as none of the divs are shown.
Sorry for the in-depth example of what I want, but it's the only way I can think to explain it. For reference, children in the container are scaled dynamically, using % values and vw/vh values. The size of the container when a certain combination of children are active is never the same across different resolutions, so this must be able to animate dynamic changes in height.
Javascript examples are welcome, however for this project I do not wish to involve any additional libraries, Javascript examples must work on modern mobile browsers.

Your question got me thining for a while and in the end I came up with an interesting solution.
Instead of trying to animate the parent element - animate the new children instead.
I've created a codepen here that does exactly that.
I'm using a CSS animation for both 'show' and 'hide' effects.
Here's a little LESS code for the main animations:
.parent{
width:33%;
overflow:hidden;
.child{
padding:.5rem;
border:1px solid #78909C;
border-bottom:0;
color:#fff;
animation:slideDown .2s ease-in forwards; //set basic "show" animation
transform-origin:top center; // set proper transform origin
&.removed{
animation:slideUp .2s ease-in forwards; // add different animation for "hide"
}
&:nth-child(even){background:#78909C;}
&:nth-child(odd){background:#546E7A;}
&:last-child{border-bottom:1px solid #78909C;}
}
}
I'm not sure if this solves your issue perfectly, but it's definitely something that will help you out here.

How to prevent transition to run on page load after height is set with javascript in Safari?

I have a div on a page with liquid height that i want to animate with CSS transitions to collapse/expand.
I set the default height of the div using JS, so if i change the height with CSS, it can easily revert back to the original state. Works fine, the issue is that the height animation will run on page load in Safari. (works fine in Chrome) Any idea how to fix this?
CSS:
div {
background: red;
transition: all 1s cubic-bezier(0.77, 0, 0.175, 1) 0s;
overflow: hidden;
}
div.hide {
height:10px !important;
}
JS:
$div = $('div');
$div.height($div.height());
$div.click(function(){
$div.toggleClass('hide');
});
Demo:
https://jsfiddle.net/69taau5m/1/

It might be a little hacky but you could always apply the transition to your div on click as well.
Did this pretty quick but it works. Check out the fiddle. Could always add some logic to only apply css on the first click.

CSS3 translate out of screen

For a number of projects now I have had elements on the page which I want to translate out of the screen area (have them fly out of the document). In proper code this should be possible just by adding a class to the relevant element after which the css would handle the rest. The problem lies in the fact that if for example
.block.hide{
-webkit-transform:translateY(-10000px);
}
is used the element will first of all fly out of the screen unnecessarily far and with an unnecessarily high speed. And purely from an aesthetic point of view there's a lot left to be desired (Theoretically speaking for example a screen with a height of 10000px could be introduced one day in the future).
(Update) The problem why percentages can't be used is that 100% is relative to the element itself, rather than to the parent element/screen size. And containing the element in a full-sized parent would be possible, but would create a mess with click events. And after a few answers, allow me to point out that I am talking about translations, not about position:absolute css3 transitions (which are all fine, but once you get enough of them they stop being fun).
What aesthetically pleasing solutions to allow an element to translate out of a screen in a fixed amount of time can you guys think of?
Example code can be found in this jsfiddle demonstrating the basic concept.
http://jsfiddle.net/ATcpw/
(see my own answer below for a bit more information)

If you wrap the .block div with a container:
<div class="container">
<div class="block"></div>
</div>
<button>Click</button>
you could expand and then, translate the container itself after the click event
document.querySelector("button").addEventListener("click", function () {
document.querySelector(".container").classList.add("hide");
});
with this style
.block {
position:absolute;
bottom:10px;
right:10px;
left:10px;
height:100px;
background:gray;
}
.container {
-webkit-transition: -webkit-transform ease-in-out 1s;
-webkit-transform-origin: top;
-webkit-transition-delay: 0.1s; /* Needed to calculate the vertical area to shift with translateY */
}
.container.hide {
position:absolute;
top:0;
left:0;
bottom:0;
right:0;
/* background:#f00; /* Uncomment to see the affected area */
-webkit-transform: translateY(-110%);
}
In this way, it is possible to apply a correct translationY percentage ( a little more than 100%, just to have it out of the way ) and mantaining the button clickable.
You could see a working example here : http://jsfiddle.net/MG7bK/
P.S: I noticed that the transition delay is needed only for the transitionY property, otherwise the animation would fail, probably because it tries to start before having an actual value for the height. It could be omitted if you use the horizontal disappearing, with translateX.

What I did is use the vh (view height) unit. It's always relative to the screen size, not the element itself:
/* moves the element one screen height down */
translateY(calc(100vh))
So if you know the position of the element in the screen (say top:320px), you can move it exactly off the screen:
/* moves the element down exactly off the bottom of the screen */
translateY(calc(100vh - 320px))

I know this is not exactly what you were asking but...
Would you consider using CSS animations with Greensock's Animation Platform? It is terribly fast (it claims it's 20 times faster than jQuery), you can see the speed test here: http://www.greensock.com/js/speed.html
It would make your code nicer I believe, and instead of trying to hack CSS animations you could focus on more important stuff.
I have created a JSFiddle here: http://jsfiddle.net/ATcpw/4/
Both CSS and possible JS look simpler:
document.querySelector("button").addEventListener("click",function(){
var toAnimate = document.querySelector(".block");
TweenMax.to(toAnimate, 2, {y: -window.innerHeight});
});
CSS:
.block{
position:absolute;
bottom:10px;
right:10px;
left:10px;
height:100px;
background-image: url(http://lorempixel.com/800/100);
}

I recently built an app which used precisely this technique for sliding 'panels' (or pages) and tabs of the application in and out of view. A basic implementation of the tabs mechanism can be seen here.
Basically (pesudo-code to illustrate the concept, minus prefixes etc):
.page {
transform: translateY(100%);
}
.page.active {
transform: translateY(0%);
}
The problem I had was that Android Webkit in particular wouldn't calculate percentage values correctly. In the end I had to use script to grab the viewport width and specify the value in pixels, then write the rules using a library for dynamic stylesheet parsing.
But eventually, and in spite of only these minor platform-specific problems, this worked perfectly for me.

Use calc method (http://jsfiddle.net/ATcpw/2/):
.block{
position:absolute;
top: -webkit-calc(100% - 110px);
right:10px;
left:10px;
height:100px;
background:gray;
-webkit-transition: all 2s;
/*this adds GPU acceleration*/
transform: translate3d(0,0,0);
-webkit-transform: translate3d(0,0,0);
}
.block.hide{
top: -100px;
}
Since you are using -webkit prefix I used it as well.
calc is supported by majority of browsers: http://caniuse.com/#search=calc

One very simple, but not aesthetically pleasing solution is to define the class dynamically:
var stylesheet = document.styleSheets[0];
var ruleBlockHide;
and
//onresize
if(ruleBlockHide) stylesheet.deleteRule(ruleBlockHide);
ruleBlockHide = stylesheet.insertRule('.block.hide{ -webkit-transform:translateY(-'+window.innerHeight+'px); }',stylesheet.cssRules.length);
see: http://jsfiddle.net/PDU7T/
The reason a reference to the rule needs to be kept is that after each screen resize the rule has to be deleted and re-added.
Although this solution gets the job done, there has to be some DOM/CSS combination which would allow this to be done without javascript (something along the lines of a 100%x100% element containing such a block, but I haven't been able to figure out any transform based way).

get the document width. then use a java script trigger to trigger the css3 translation.
function translate(){
var width = document.body.Width;
document.getElementById('whateverdiv').style='translateX(' + width + 'px)';
}

This is simple
add the following to your div
.myDiv {
-webkit-transition-property: left;
-webkit-transition-duration: 0.5s;
-webkit-transition-timing-function: ease-in-out;
-webkit-transition-delay: initial
}
then change the "left" property of it either by adding an additional class or by jQuery
This will animate it along the x-axis
Note: you can change the -webkit-transition-property to any property you want and this will animate it

Slide + fade effect using CSS transitions

I'm trying to replicate this effect using CSS effects or transitions.
Using animations I can animate the opacity, but only fadeIn, and the height (which should control the slide) doesn't seem to work at all :(
The closest I've got is by using javascript to set a temporary class on the element I want to animate, and on which I apply the initial opacity. But height doesn't work either. And there seems to be a slight delay on animation start.
Any other ideas?
So I ended up using the solution posted in the question Simon mentioned: With javascript I wrap the element I want to animate within a "wrapper" DIV on which I apply the animation. The wrapper will get its height changed from 0 to the height of the content DIV every time the label is clicked:
fiddle here
I know it requires some javascript, but the idea is to make the animation in CSS, and this is what it does. And if JS is disabled, the toggle will still work...

You can't currently animate on height when one of the heights involved is auto, you have to set two explicit heights. There's an extensive workaround posted as an answer to this similar question.

I made an alteration to your JS Fiddle, I beleive this is what you want; please see it here.
You need to specify a height on the div originally (0) and don't forget overflow:hidden; so that the content doesn't 'spil out' of the div. You will still need jQuery / Javascript however, to toggle a class but it means much less Javascript is required. (I toggled the class "change" which you will see on that fiddle)
input {
display:none;
}
label {
display:inline-block;
}
div {
white-space: pre;
background: #eee;
color: #333;
overflow:hidden;
height:0;
opacity:0;
-moz-transition:height 1s opacity 1s;
-webkit-transition:height 1s opacity 1s;
-o-transition:height 1s opacity 1s;
-ms-transition:height 1s opacity 1s;
transition:height 1s, opacity 1s;
}
.changed {
height:200px;
opacity: 1;
}
I added a few vendor prefixes to the transition CSS propery as I'm not sure what browser you'll be using and I'm on firefox so I need the -moz- prefix lol :)
The only problem I can see with this is that height:auto or height:100% doesn't animate, so you'll need to specify ems or px... If this is going to be a problem (like if the content will be dynamic), I would advise using jQuery for the height animation.

flickering jquery animations

Hey guys I'm in the process of making this website here: http://craigmarkdrums.com (bare in mind that it's still very early days, so no judging, yeh hehe) and take a look at the menu. In firefox it works fine, but in chrome and safari you can see a flickering in the right hand corner. i think what is happenning is it's the box changing size. they are all li's in a ul. here is my jquery:
$(function()
{
$('#nav li').hover(function()
{
$(this).children().stop(true, true).fadeIn();
$(this).stop().animate({
width: '90px'
}, 300, 'swing');
$(this).siblings().stop().animate({
width: '42px'
}, 300, 'swing');
}, function()
{
$(this).children().stop(true, true).fadeOut();
$(this).stop().animate({
width: '50px'
}, 200);
$(this).siblings().stop().animate({
width: '50px'
}, 200);
});
});
any ideas what i'm doing wrong, or how i could improve this code?
cheers
Matt

You're intuition is correct. To accomplish this effect using floats, you'd need to handle the animation yourself and resize all LIs in a single step, making sure the sum of their widths matched the containing element. Or try using absolute positioning and handling the offsets yourself.
.. Or you could cheat and put the whole thing inside a container div whose background was the photo your using. That way any bleed through would be of the photo, not the white background.

I'd suggest moving over to a flexible box layout for this (CSS3). You can just increase the size of the box you want and the others will shrink away by themselves.
This page has a lot of examples of the flex-box layout (Take a look at the second example)
Add this css to your menu panels:
-moz-box-flex: 1;
-webkit-box-flex: 1;
box-flex: 1;
And then set the width of the hovered element. For added fluidity, try adding some slight transition delays like this (I've separated the values for easy reading and understanding):
-moz-transition-property: width;
-moz-transition-duration: 0.2s;
-moz-transition-easing: ease-in-out;
-webkit-transition-property: width;
-webkit-transition-duration: 0.2s;
-webkit-transition-easing: ease-in-out;
transition-property: width;
transition-duration: 0.2s;
transition-easing: ease-in-out;