使用 Javascript 垂直居中 div（可变高度）
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Vertically center div with Javascript (variable height)
提问by cocco
I'm trying to vertically center a div with Javascript. Because the text is going to be changing, I cannot use a fixed height.
我正在尝试使用 Javascript 垂直居中一个 div。因为文本会发生变化，所以我不能使用固定的高度。
I'd like to do this withoutJquery.
我想在没有Jquery 的情况下做到这一点。
#box2 {
width: 100%;
height: 100%;
position:relative;
background-color: orange;
}
#informationBox {
padding: 0.5em;
background-color: #fff;
border-radius: 12pt;
border: solid black 3pt;
max-width: 683px;
margin: 0 auto;
text-align: center;
}
Javascript:
Javascript：
var container = document.getElementById("#box2");
var inner = document.getElementById("#informationBox");
var inHeight = inner.offsetHeight;
container.style.height=(window.innerHeight);
container.style.width=window.innerWidth;
var conHeight=container.offsetHeight;
inner.style.marginTop=((conHeight-inHeight)/2);
Any help would be great :)
任何帮助都会很棒:)
回答by rgthree
You pretty much have it, you just need to change a couple things. First, getElementByIdtakes just an id-string, not a selector. Secondly, you need to add 'px' to your style declration.
你几乎拥有它，你只需要改变一些事情。首先，getElementById只需要一个 id 字符串，而不是一个选择器。其次，您需要在样式声明中添加“px”。
var container = document.getElementById("box2");
var inner = document.getElementById("informationBox");
var inHeight = inner.offsetHeight;
container.style.height = window.innerHeight;
container.style.width = window.innerWidth;
var conHeight = container.offsetHeight;
inner.style.marginTop = ((conHeight-inHeight)/2)+'px';
Here's an updated fiddle: http://jsfiddle.net/EttZQ/1/
这是一个更新的小提琴：http: //jsfiddle.net/EttZQ/1/
回答by cocco
Using js with line-height property.
使用具有 line-height 属性的 js。
less javascript, and precise centering.
更少的 javascript 和精确的居中。
box/info can have min/max-width/height & % or px ...
box/info 可以有 min/max-width/height & % 或 px ...
also resizes with the window.
也随着窗口调整大小。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>center</title>
<style>
html,body{
width:100%;
height:100%;
margin:0;
padding:0;
}
#box{
width:100%;
height:100%;
text-align:center;
}
#info{
display:inline-block;
margin:0;padding:0 16px;
line-height:24px;
border-radius: 12pt;
border: solid black 3pt;
text-align: center;
vertical-align:middle;
box-sizing: border-box;
}
</style>
<script>
var center=function(){
var b=document.getElementById('box');
b.style['line-height']=b.offsetHeight+'px';
}
window.onload=center;
window.onresize=center;
</script>
</head>
<body>
<div id="box"><div id="info">center me pls<br>test</div></div>
</body>
</html>
回答by AntouanK
One simple CSS solution.
一种简单的 CSS 解决方案。
http://jsfiddle.net/antouank/EttZQ/2/
http://jsfiddle.net/antouank/EttZQ/2/
body {
margin: 0;
}
#box2 {
width: 100%;
height: 100%;
position:absolute;
background-color: orange;
}
#informationBox {
padding: 0.5em;
background-color: #fff;
border-radius: 12pt;
border: solid black 3pt;
max-width: 100px;
margin: 0 auto;
text-align: center;
position: absolute;
top: 50%;
left: 50%;
}
You only need to calculate the width/height of your element, and change 50% to whatever you need to center it.
您只需要计算元素的宽度/高度，并将 50% 更改为您需要将其居中的任何值。
回答by CodeToad
Make container pos anything other than static. Box : pos absolute. top:50% When box height changes, set margin top of box to -1 * height/2.
使容器 pos 成为静态以外的任何东西。框：绝对位置。top:50% 当框高度改变时，设置框的顶部边距为-1 *高度/2。
