如何转换高度:0;到height:auto;使用CSS? [英] How can I transition height: 0; to height: auto; using CSS?
问题描述
我试图使用CSS转换向下滑动< ul>
。
c $ c>< ul> 开始于 height:0;
。在悬停时,高度设置为 height:auto;
。 < / p>
如果我从 height:40px做到这一点, 到
height:auto;
,则它将滑动到 height:0;
然后突然跳到正确的高度。
我还可以不使用JavaScript吗?
div class =snippetdata-lang =jsdata-hide =falsedata-console =falsedata-babel =false>
#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;}
CSS的两个片段之间的唯一区别是其高度为0,其他高度为40.< hr />< div id = parent0> < h1>悬停我(高度:0)< / h1> < div id =child0>部分内容< br />部分内容< br />部分内容< br />部分内容< br /某些内容< br /> < / div>< / div>< hr />< div id =parent40> < h1>悬停我(身高:40)< / h1> < div id =child40>部分内容< br />部分内容< br />部分内容< br />部分内容< br /某些内容< br /> < / div>< / div>
在转换中使用 max-height
,而不是 height
。
请参阅 JSFiddle演示由Chris Jordan在另一个回答中提供。
#menu #list {max-height:0; transition:max-height 0.15s ease-out; overflow:hidden;背景:#d5d5d5;}#menu:hover #list {max-height:500px; transition:max-height 0.25s ease-in;}
< div id =menu> < a> hover me< / a> < ul id =list> <! - 创建一束,或者一束,不是看到时间。 - > < li> item< / li> < li> item< / li> < li> item< / li> < li> item< / li> < li> item< / li> < / ul>< / div>
I am trying to make a <ul>
slide down using CSS transitions.
The <ul>
starts off at height: 0;
. On hover, the height is set to height:auto;
. However, this is causing it to simply appear, not transition,
If I do it from height: 40px;
to height: auto;
, then it will slide up to height: 0;
, and then suddenly jump to the correct height.
How else could I do this without using 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>
Use max-height
in the transformation and not height
. And set a value on max-height to something bigger than your box will ever get.
See JSFiddle demo provided by Chris Jordan in another answer here.
#menu #list {
max-height: 0;
transition: max-height 0.15s ease-out;
overflow: hidden;
background: #d5d5d5;
}
#menu:hover #list {
max-height: 500px;
transition: max-height 0.25s ease-in;
}
<div id="menu">
<a>hover me</a>
<ul id="list">
<!-- Create a bunch, or not a bunch, of li's to see the timing. -->
<li>item</li>
<li>item</li>
<li>item</li>
<li>item</li>
<li>item</li>
</ul>
</div>
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