كيف يمكنني تحويل الارتفاع: 0 ؛ لارتفاع: السيارات. باستخدام CSS؟


Answers

يجب عليك استخدام scale بدلاً من ذلك.

HTML:

<p>Here (scaleY(1))</p>
<ul>
  <li>Coffee</li>
  <li>Tea</li>
  <li>Milk</li>
</ul>

CSS:

ul {
    background-color: #eee;
    transform: scaleY(0);    
    transform-origin: top;
    transition: transform 0.26s ease;
}

p:hover ~ ul {
    transform: scaleY(1);
}

لقد قدمت إصدارًا مسبوقًا من المورد من الشفرة الواردة أعلاه على jsfiddle و http://jsfiddle.net/dotnetCarpenter/PhyQc/9/ وغيرت jsfiddle الخاص بك لاستخدام scale Y بدلاً من الارتفاع ، http://jsfiddle.net/dotnetCarpenter/7cnfc/206/ .

Question

أحاول أن أنزل <ul> إلى أسفل باستخدام انتقالات CSS.

يبدأ <ul> في height: 0; . عند التمرير ، يتم تعيين height:auto; إلى height:auto; . ومع ذلك ، فإن هذا يؤدي إلى الظهور ببساطة ، وليس الانتقال ،

إذا قمت بذلك من height: 40px; height: auto; ، ثم ستنزلق إلى height: 0; ، ثم القفز فجأة إلى الارتفاع الصحيح.

كيف يمكنني القيام بذلك دون استخدام JavaScript؟

#child0 {
  height: 0;
  overflow: hidden;
  background-color: #dedede;
  -moz-transition: height 1s ease;
  -webkit-transition: height 1s ease;
  -o-transition: height 1s ease;
  transition: height 1s ease;
}
#parent0:hover #child0 {
  height: auto;
}
#child40 {
  height: 40px;
  overflow: hidden;
  background-color: #dedede;
  -moz-transition: height 1s ease;
  -webkit-transition: height 1s ease;
  -o-transition: height 1s ease;
  transition: height 1s ease;
}
#parent40:hover #child40 {
  height: auto;
}
h1 {
  font-weight: bold;
}
The only difference between the two snippets of CSS is one has height: 0, the other height: 40.
<hr>
<div id="parent0">
  <h1>Hover me (height: 0)</h1>
  <div id="child0">Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>
  </div>
</div>
<hr>
<div id="parent40">
  <h1>Hover me (height: 40)</h1>
  <div id="child40">Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>Some content
    <br>
  </div>
</div>




Flexbox Solution

الايجابيات:

  • simple
  • no JS
  • smooth transition

سلبيات:

  • element needs to be put in a fixed height flex container

The way it works is by always having flex-basis: auto on the element with content, and transitioning flex-grow and flex-shrink instead.

Edit: Improved JS Fiddle inspired by the Xbox One interface.

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: 0.25s;
  font-family: monospace;
}

body {
  margin: 10px 0 0 10px;
}

.box {
  width: 150px;
  height: 150px;
  margin: 0 2px 10px 0;
  background: #2d333b;
  border: solid 10px #20262e;
  overflow: hidden;
  display: inline-flex;
  flex-direction: column;
}

.space {
  flex-basis: 100%;
  flex-grow: 1;
  flex-shrink: 0;    
}

p {
  flex-basis: auto;
  flex-grow: 0;
  flex-shrink: 1;
  background: #20262e;
  padding: 10px;
  width: 100%;
  text-align: left;
  color: white;
}

.box:hover .space {
  flex-grow: 0;
  flex-shrink: 1;
}
  
.box:hover p {
  flex-grow: 1;
  flex-shrink: 0;    
}
<div class="box">
  <div class="space"></div>
  <p>
    Super Metroid Prime Fusion
  </p>
</div>
<div class="box">
  <div class="space"></div>
  <p>
    Resident Evil 2 Remake
  </p>
</div>
<div class="box">
  <div class="space"></div>
  <p>
    Yolo The Game
  </p>
</div>
<div class="box">
  <div class="space"></div>
  <p>
    Final Fantasy 7 Remake + All Additional DLC + Golden Tophat
  </p>
</div>
<div class="box">
  <div class="space"></div>
  <p>
    DerpVille
  </p>
</div>

JS Fiddle




Here's a solution I just used in combination with jQuery. This works for the following HTML structure:

<nav id="main-nav">
    <ul>
        <li>
            <a class="main-link" href="yourlink.html">Link</a>
            <ul>
                <li><a href="yourlink.html">Sub Link</a></li>
            </ul>
        </li>
    </ul>
</nav>

and the function:

    $('#main-nav li ul').each(function(){
        $me = $(this);

        //Count the number of li elements in this UL
        var liCount = $me.find('li').size(),
        //Multiply the liCount by the height + the margin on each li
            ulHeight = liCount * 28;

        //Store height in the data-height attribute in the UL
        $me.attr("data-height", ulHeight);
    });

You could then use a click function to set and remove the height using css()

$('#main-nav li a.main-link').click(function(){
    //Collapse all submenus back to 0
    $('#main-nav li ul').removeAttr('style');

    $(this).parent().addClass('current');

    //Set height on current submenu to it's height
    var $currentUl = $('li.current ul'),
        currentUlHeight = $currentUl.attr('data-height');
})

CSS:

#main-nav li ul { 
    height: 0;
    position: relative;
    overflow: hidden;
    opacity: 0; 
    filter: alpha(opacity=0); 
    -ms-filter: "alpha(opacity=0)";
    -khtml-opacity: 0; 
    -moz-opacity: 0;
    -webkit-transition: all .6s ease-in-out;
    -moz-transition: all .6s ease-in-out;
    -o-transition: all .6s ease-in-out;
    -ms-transition: all .6s ease-in-out;
    transition: all .6s ease-in-out;
}

#main-nav li.current ul {
    opacity: 1.0; 
    filter: alpha(opacity=100); 
    -ms-filter: "alpha(opacity=100)";
    -khtml-opacity: 1.0; 
    -moz-opacity: 1.0;
}

.ie #main-nav li.current ul { height: auto !important }

#main-nav li { height: 25px; display: block; margin-bottom: 3px }



Use max-height with different transition easing and delay for each state.

HTML:

<a href="#" id="trigger">Hover</a>
<ul id="toggled">
    <li>One</li>
    <li>Two</li>
    <li>Three</li>
<ul>

CSS:

#toggled{
    max-height: 0px;
    transition: max-height .8s cubic-bezier(0, 1, 0, 1) -.1s;
}

#trigger:hover + #toggled{
    max-height: 9999px;
    transition-timing-function: cubic-bezier(0.5, 0, 1, 0); 
    transition-delay: 0s;
}

See example: http://jsfiddle.net/0hnjehjc/1/




I think I came up with a really solid solution

OK! I know this problem is as old as the internet but I think I have a solution which I turned into a plugin called mutant-transition . My solution sets the style="" attributes for tracked elements whenever theres a change in the DOM. the end result is that you can use good ole CSS for your transitions and not use hacky fixes or special javascript. The only thing you have to do is set what you want to track on the element in question using data-mutant-attributes="X" .

<div data-mutant-attributes="height">                                                                      
        This is an example with mutant-transition                                                                                                          
    </div>

Thats it! This solution uses MutationObserver to follow changes in the DOM. Because of this, you don't really have to set anything up or use javascript to manually animate things. Changes are tracked automatically. However, because it uses MutationObserver, this will only transition in IE11+.

Fiddles!




Ok, so I think I came up with a super simple answer... no max-height , uses relative positioning, works on li elements, & is pure CSS. I have not tested in anything but Firefox, though judging by the CSS, it should work on all browsers.

FIDDLE: http://jsfiddle.net/n5XfG/2596/

CSS

.wrap { overflow:hidden; }

.inner {
            margin-top:-100%;
    -webkit-transition:margin-top 500ms;
            transition:margin-top 500ms;
}

.inner.open { margin-top:0px; }

HTML

<div class="wrap">
    <div class="inner">Some Cool Content</div>
</div>



This is regular problem I've solved like this

http://jsfiddle.net/ipeshev/d1dfr0jz/

Try to set delay of closed state to some negative number and play a little bit with the value. You will see the difference.It can be made almost to lie the human eye ;).

It works in major browsers, but good enough for me. It is strange but give some results.

.expandable {
    max-height: 0px;
    overflow: hidden;
    transition: all 1s linear -0.8s;
}

button:hover ~ .expandable {
    max-height: 9000px;
    transition: all 1s ease-in-out;
}



كان الحل الذي استخدمته دائمًا هو التلاشي أولاً ، ثم تقليص font-size padding وقيم margin . لا يبدو الأمر مثل المسح ، ولكنه يعمل بدون height ثابت أو max-height .

/* final display */
.menu .list {
    margin: .5em 1em;
    padding: 1em;
}

/* hide */
.menu:not(:hover) .list {
    font-size: 0;
    margin: 0;
    opacity: 0;
    padding: 0;
    /* fade out, then shrink */
    transition: opacity .25s,
                font-size .5s .25s,
                margin .5s .25s,
                padding .5s .25s;
}

/* reveal */
.menu:hover .list {
    /* unshrink, then fade in */
    transition: font-size .25s,
                margin .25s,
                padding .25s,
                opacity .5s .25s;
}

مثال العمل:

/* final display */
#menu #list {
    margin: .5em 1em;
    padding: 1em;
}

/* hide */
#menu:not(:hover) #list {
    font-size: 0;
    margin: 0;
    opacity: 0;
    padding: 0;
    /* fade out, then shrink */
    transition: opacity .25s,
                font-size .5s .25s,
                margin .5s .25s,
                padding .5s .25s;
}

/* reveal */
#menu:hover #list {
    /* unshrink, then fade in */
    transition: font-size .25s,
                margin .25s,
                padding .25s,
                opacity .5s .25s;
}
<div id="menu">
    <b>hover me</b>
    <ul id="list">
        <li>item</li>
        <li>item</li>
        <li>item</li>
        <li>item</li>
        <li>item</li>
    </ul>
</div>

Spacing.




The max-height solution from Jake works well, if the hard-coded max-height value supplied is not much bigger than the real height (because otherwise there are undesirable delays and timing problems). On the other hand if the hard-coded value accidentially is not bigger than the real height the element won't open up completely.

The following CSS only solution also requires a hard-coded size that should be bigger than most of the occurring real sizes. However this solution also works if the real size is in some situations bigger than the hard-coded size. In that event the transition might jump a bit, but it will never leave a partially visible element. So this solution could also be used for unknown content, eg from a database, where you just know that the content is usually not bigger than x pixels, but there are exceptions.

Idea is to use a negative value for margin-bottom (or margin-top for a slightly diffenrent animation) and to place the content element into a middle element with overflow:hidden. The negative margin of the content element so reduces the height of the middle element.

The following code uses a transition on margin-bottom from -150px to 0px. This alone works fine as long as the content element is not higher than 150px. In addition it uses a transition on max-height for the middle element from 0px to 100%. This finally hides the middle element if the content element is higher than 150px. For max-height the transition is just used to delay its application by a second when closing, not for a smooth visiual effect ( and therefore it can run from 0px to 100%).

CSS:

.content {
  transition: margin-bottom 1s ease-in;
  margin-bottom: -150px;
}
.outer:hover .middle .content {
  transition: margin-bottom 1s ease-out;
  margin-bottom: 0px
}
.middle {
  overflow: hidden;
  transition: max-height .1s ease 1s;
  max-height: 0px
}
.outer:hover .middle {
  transition: max-height .1s ease 0s;
  max-height: 100%
}

HTML:

<div class="outer">
  <div class="middle">
    <div class="content">
      Sample Text
      <br> Sample Text
      <br> Sample Text
      <div style="height:150px">Sample Test of height 150px</div>
      Sample Text
    </div>
  </div>
  Hover Here
</div>

The value for margin bottom should be negative and as close as possible to the real height of the content element. If it('s absoute value) is bigger there are similar delay and timing problems as with the max-height solutions, which however can be limited as long as the hard coded size is not much bigger than the real one. If the absolute value for margin-bottom is smaller than the real height the tansition jumps a bit. In any case after the transition the content element is either fully displayed or fully removed.

For more details see my blog post http://www.taccgl.org/blog/css_transition_display.html#combined_height




Here's a way to transition from any starting height, including 0, to auto (full size and flexible) without requiring hard-set code on a per-node basis or any user-code to initialize: https://github.com/csuwildcat/transition-auto . This is basically the holy grail for what you want, I believe --> http://codepen.io/csuwldcat/pen/kwsdF . Just slap the following JS file into your page, and all you need to do after that is add/remove a single boolean attribute - reveal="" - from the nodes you want to expand and contract.

Here's all you need to do as the user, once you include the code block found below the example code:

/*** Nothing out of the ordinary in your styles ***/
<style>
    div {
        height: 0;
        overflow: hidden;
        transition: height 1s;
    }
</style>

/*** Just add and remove one attribute and transition to/from auto! ***/

<div>
    I have tons of content and I am 0px in height you can't see me...
</div>

<div reveal>
     I have tons of content and I am 0px in height you can't see me...
     but now that you added the 'reveal' attribute, 
     I magically transitioned to full height!...
</div>

Here's the code block to include in your page, after that, it's all gravy:

Drop this JS file in your page - it all Just Works™

/ * Code for height: auto; transitioning * /

(function(doc){

/* feature detection for browsers that report different values for scrollHeight when an element's overflow is hidden vs visible (Firefox, IE) */
var test = doc.documentElement.appendChild(doc.createElement('x-reveal-test'));
    test.innerHTML = '-';
    test.style.cssText = 'display: block !important; height: 0px !important; padding: 0px !important; font-size: 0px !important; border-width: 0px !important; line-height: 1px !important; overflow: hidden !important;';
var scroll = test.scrollHeight || 2;
doc.documentElement.removeChild(test);

var loading = true,
    numReg = /^([0-9]*\.?[0-9]*)(.*)/,
    skipFrame = function(fn){
      requestAnimationFrame(function(){
        requestAnimationFrame(fn);
      });
    },
    /* 2 out of 3 uses of this function are purely to work around Chrome's catastrophically busted implementation of auto value CSS transitioning */
    revealFrame = function(el, state, height){
        el.setAttribute('reveal-transition', 'frame');
        el.style.height = height;
        skipFrame(function(){
            el.setAttribute('reveal-transition', state);
            el.style.height = '';
        });
    },
    transitionend = function(e){
      var node = e.target;
      if (node.hasAttribute('reveal')) {
        if (node.getAttribute('reveal-transition') == 'running') revealFrame(node, 'complete', '');
      } 
      else {
        node.removeAttribute('reveal-transition');
        node.style.height = '';
      }
    },
    animationstart = function(e){
      var node = e.target,
          name = e.animationName;   
      if (name == 'reveal' || name == 'unreveal') {

        if (loading) return revealFrame(node, 'complete', 'auto');

        var style = getComputedStyle(node),
            offset = (Number(style.paddingTop.match(numReg)[1])) +
                     (Number(style.paddingBottom.match(numReg)[1])) +
                     (Number(style.borderTopWidth.match(numReg)[1])) +
                     (Number(style.borderBottomWidth.match(numReg)[1]));

        if (name == 'reveal'){
          node.setAttribute('reveal-transition', 'running');
          node.style.height = node.scrollHeight - (offset / scroll) + 'px';
        }
        else {
            if (node.getAttribute('reveal-transition') == 'running') node.style.height = '';
            else revealFrame(node, 'running', node.scrollHeight - offset + 'px');
        }
      }
    };

doc.addEventListener('animationstart', animationstart, false);
doc.addEventListener('MSAnimationStart', animationstart, false);
doc.addEventListener('webkitAnimationStart', animationstart, false);
doc.addEventListener('transitionend', transitionend, false);
doc.addEventListener('MSTransitionEnd', transitionend, false);
doc.addEventListener('webkitTransitionEnd', transitionend, false);

/*
    Batshit readyState/DOMContentLoaded code to dance around Webkit/Chrome animation auto-run weirdness on initial page load.
    If they fixed their code, you could just check for if(doc.readyState != 'complete') in animationstart's if(loading) check
*/
if (document.readyState == 'complete') {
    skipFrame(function(){
        loading = false;
    });
}
else document.addEventListener('DOMContentLoaded', function(e){
    skipFrame(function(){
        loading = false;
    });
}, false);

/* Styles that allow for 'reveal' attribute triggers */
var styles = doc.createElement('style'),
    t = 'transition: none; ',
    au = 'animation: reveal 0.001s; ',
    ar = 'animation: unreveal 0.001s; ',
    clip = ' { from { opacity: 0; } to { opacity: 1; } }',
    r = 'keyframes reveal' + clip,
    u = 'keyframes unreveal' + clip;

styles.textContent = '[reveal] { -ms-'+ au + '-webkit-'+ au +'-moz-'+ au + au +'}' +
    '[reveal-transition="frame"] { -ms-' + t + '-webkit-' + t + '-moz-' + t + t + 'height: auto; }' +
    '[reveal-transition="complete"] { height: auto; }' +
    '[reveal-transition]:not([reveal]) { -webkit-'+ ar +'-moz-'+ ar + ar +'}' +
    '@-ms-' + r + '@-webkit-' + r + '@-moz-' + r + r +
    '@-ms-' + u +'@-webkit-' + u + '@-moz-' + u + u;

doc.querySelector('head').appendChild(styles);

})(document);

/ * Code for DEMO * /

    document.addEventListener('click', function(e){
      if (e.target.nodeName == 'BUTTON') {
        var next = e.target.nextElementSibling;
        next.hasAttribute('reveal') ? next.removeAttribute('reveal') : next.setAttribute('reveal', '');
      }
    }, false);



I have not read everything in detail but I have had this problem recently and I did what follows:

div.class{
   min-height:1%;
   max-height:200px;
   -webkit-transition: all 0.5s ease;
   -moz-transition: all 0.5s ease;
   -o-transition: all 0.5s ease;
   -webkit-transition: all 0.5s ease;
   transition: all 0.5s ease;
   overflow:hidden;
}

div.class:hover{
   min-height:100%;
   max-height:3000px;
}

This allows you to have a div that at first shows content up to 200px height and on hover it's size becomes at least as high as the whole content of the div. The Div does not become 3000px but 3000px is the limit that I am imposing. Make sure to have the transition on the non :hover, otherwise you might get some strange rendering. In this way the :hover inherits from the non :hover.

Transition does not work form px to % or to auto. You need to use same unit of measure. This works fine for me. Using HTML5 makes it perfect....

Remember that there is always a work around... ; )

Hope someone finds this useful




يتمثل الحل في نقل الحد الأقصى للارتفاع إلى ارتفاع المحتوى الدقيق للحصول على حركة رسوم متحركة لطيفة ، ثم استخدام رد اتصال انتقالي لضبط الارتفاع الأقصى إلى 9999 بكسل بحيث يمكن تغيير حجم المحتوى بحرية.

var content = $('#content');
content.inner = $('#content .inner'); // inner div needed to get size of content when closed

// css transition callback
content.on('transitionEnd webkitTransitionEnd transitionend oTransitionEnd msTransitionEnd', function(e){
    if(content.hasClass('open')){
        content.css('max-height', 9999); // try setting this to 'none'... I dare you!
    }
});

$('#toggle').on('click', function(e){
    content.toggleClass('open closed');
    content.contentHeight = content.outerHeight();
    
    if(content.hasClass('closed')){
        
        // disable transitions & set max-height to content height
        content.removeClass('transitions').css('max-height', content.contentHeight);
        setTimeout(function(){
            
            // enable & start transition
            content.addClass('transitions').css({
                'max-height': 0,
                'opacity': 0
            });
            
        }, 10); // 10ms timeout is the secret ingredient for disabling/enabling transitions
        // chrome only needs 1ms but FF needs ~10ms or it chokes on the first animation for some reason
        
    }else if(content.hasClass('open')){  
        
        content.contentHeight += content.inner.outerHeight(); // if closed, add inner height to content height
        content.css({
            'max-height': content.contentHeight,
            'opacity': 1
        });
        
    }
});
.transitions {
    transition: all 0.5s ease-in-out;
    -webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
}

body {
    font-family:Arial;
    line-height: 3ex;
}
code {
    display: inline-block;
    background: #fafafa;
    padding: 0 1ex;
}
#toggle {
    display:block;
    padding:10px;
    margin:10px auto;
    text-align:center;
    width:30ex;
}
#content {
    overflow:hidden;
    margin:10px;
    border:1px solid #666;
    background:#efefef;
    opacity:1;
}
#content .inner {
    padding:10px;
    overflow:auto;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<div id="content" class="open">
    <div class="inner">
        <h3>Smooth CSS Transitions Between <code>height: 0</code> and <code>height: auto</code></h3>
        <p>A clever workaround is to use <code>max-height</code> instead of <code>height</code>, and set it to something bigger than your content. Problem is the browser uses this value to calculate transition duration. So if you set it to <code>max-height: 1000px</code> but the content is only 100px high, the animation will be 10x too fast.</p>
        <p>Another option is to measure the content height with JS and transition to that fixed value, but then you have to keep track of the content and manually resize it if it changes.</p>
        <p>This solution is a hybrid of the two - transition to the measured content height, then set it to <code>max-height: 9999px</code> after the transition for fluid content sizing.</p>
    </div>
</div>

<br />

<button id="toggle">Challenge Accepted!</button>




I was able to do this. I have a .child & a .parent div. The child div fits perfectly within the parent's width/height with absolute positioning. I then animate the translate property to push it's Y value down 100% . Its very smooth animation, no glitches or down sides like any other solution here.

Something like this, pseudo code

.parent{ position:relative; overflow:hidden; } 
/** shown state */
.child {
  position:absolute;top:0;:left:0;right:0;bottom:0;
  height: 100%;
  transition: transform @overlay-animation-duration ease-in-out;
  .translate(0, 0);
}

/** Animate to hidden by sliding down: */
.child.slidedown {
  .translate(0, 100%); /** Translate the element "out" the bottom of it's .scene container "mask" so its hidden */
}

You would specify a height on .parent , in px , % , or leave as auto . This div then masks out the .child div when it slides down.




As I post this there are over 30 answers already, but I feel my answer improves on the already accepted answer by jake.

I was not content with the issue that arises from simply using max-height and CSS3 transitions, since as many commenters noted, you have to set your max-height value very close to the actual height or you'll get a delay. See this JSFiddle for an example of that problem.

To get around this (while still using no JavaScript), I added another HTML element that transitions the transform: translateY CSS value.

This means both max-height and translateY are used: max-height allows the element to push down elements below it, while translateY gives the "instant" effect we want. The issue with max-height still exists, but its effect is lessened. This means you can set a much larger height for your max-height value and worry about it less.

The overall benefit is that on the transition back in (the collapse), the user sees the translateY animation immediately, so it doesn't really matter how long the max-height takes.

Solution as Fiddle

body {
  font-family: sans-serif;
}

.toggle {
  position: relative;
  border: 2px solid #333;
  border-radius: 3px;
  margin: 5px;
  width: 200px;
}

.toggle-header {
  margin: 0;
  padding: 10px;
  background-color: #333;
  color: white;
  text-align: center;
  cursor: pointer;
}

.toggle-height {
  background-color: tomato;
  overflow: hidden;
  transition: max-height .6s ease;
  max-height: 0;
}

.toggle:hover .toggle-height {
  max-height: 1000px;
}

.toggle-transform {
  padding: 5px;
  color: white;
  transition: transform .4s ease;
  transform: translateY(-100%);
}

.toggle:hover .toggle-transform {
  transform: translateY(0);
}
<div class="toggle">
  <div class="toggle-header">
    Toggle!
  </div>
  <div class="toggle-height">
    <div class="toggle-transform">
      <p>Content!</p>
      <p>Content!</p>
      <p>Content!</p>
      <p>Content!</p>
    </div>
  </div>
</div>

<div class="toggle">
  <div class="toggle-header">
    Toggle!
  </div>
  <div class="toggle-height">
    <div class="toggle-transform">
      <p>Content!</p>
      <p>Content!</p>
      <p>Content!</p>
      <p>Content!</p>
    </div>
  </div>
</div>




إن الحل البصري لتحريك الارتفاع باستخدام تحويلات CSS3 هو تحريك الحشو بدلاً من ذلك.

لا يمكنك الحصول على تأثير المسح بالكامل ، ولكن الالتفاف مع مدة الانتقال وقيم الحشو يجب أن تجعلك قريبًا بما فيه الكفاية. إذا كنت لا تريد ضبط ارتفاع / أقصى ارتفاع بشكل واضح ، فيجب أن يكون هذا ما تبحث عنه.

div {
    height: 0;
    overflow: hidden;
    padding: 0 18px;
    -webkit-transition: all .5s ease;
       -moz-transition: all .5s ease;
            transition: all .5s ease;
}
div.animated {
    height: auto;
    padding: 24px 18px;
}

http://jsfiddle.net/catharsis/n5XfG/17/ (مقسومًا على stephband أعلى jsFiddle)






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