<div>元素在页面中垂直和水平的最佳方法?
我知道左边距:auto;margin-right:汽车;会以水平方向为中心,但是垂直方向的最佳方法是什么呢?
<div>元素在页面中垂直和水平的最佳方法?
我知道左边距:auto;margin-right:汽车;会以水平方向为中心,但是垂直方向的最佳方法是什么呢?
当前回答
尽管当OP问这个问题时,这并没有起作用,但我认为,至少对于现代浏览器来说,最好的解决方案是使用display: flex或伪类。
你可以在下面的小提琴中看到一个例子。 这是更新后的小提琴。
对于伪类,一个例子可以是:
.centerPseudo {
display:inline-block;
text-align:center;
}
.centerPseudo::before{
content:'';
display:inline-block;
height:100%;
vertical-align:middle;
width:0px;
}
display: flex的用法,根据css-tricks和MDN说明如下:
.centerFlex {
align-items: center;
display: flex;
justify-content: center;
}
flex还有其他可用的属性,在上面提到的链接中解释了这些属性,并提供了进一步的示例。
如果你必须支持不支持css3的旧浏览器,那么你可能应该使用javascript或其他答案中显示的固定宽度/高度解决方案。
其他回答
我在看Laravel的视图文件,注意到他们完美地将文本居中。我立刻想起了这个问题。 他们是这样做的:
<html>
<head>
<title>Laravel</title>
<!--<link href='//fonts.googleapis.com/css?family=Lato:100' rel='stylesheet' type='text/css'>-->
<style>
.container {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
display: table;
}
.inside {
text-align: center;
display: table-cell;
vertical-align: middle;
}
</style>
</head>
<body>
<div class="container">
<div class="inside">This text is centered</div>
</div>
</body>
结果如下所示:
这项技术的简单性令人惊叹: (尽管这个方法有它的含义,但是如果您只需要将元素居中,而不考虑其余内容的流,那么它是可以的。小心使用)
标记:
<div>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum accumsan tellus purus, et mollis nulla consectetur ac. Quisque id elit at diam convallis venenatis eget sed justo. Nunc egestas enim mauris, sit amet tempor risus ultricies in. Sed dignissim magna erat, vel laoreet tortor bibendum vitae. Ut porttitor tincidunt est imperdiet vestibulum. Vivamus id nibh tellus. Integer massa orci, gravida non imperdiet sed, consectetur ac quam. Nunc dignissim felis id tortor tincidunt, a eleifend nulla molestie. Phasellus eleifend leo purus, vel facilisis massa dignissim vitae. Pellentesque libero sapien, tincidunt ut lorem non, porta accumsan risus. Morbi tempus pharetra ex, vel luctus turpis tempus eu. Integer vitae sagittis massa, id gravida erat. Maecenas sed purus et magna tincidunt faucibus nec eget erat. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc nec mollis sem.</div>
和CSS:
div {
color: white;
background: red;
padding: 15px;
position: absolute;
top: 50%;
left: 50%;
-ms-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
}
这将使元素水平和垂直居中。没有负边距,只有变换的幂。我们也应该忘记IE8,不是吗?
如果你知道div的定义大小,你可以使用calc。
实例:https://jsfiddle.net/o8416eq3/
注意:只有当你在CSS中硬编码了' ' div '的宽度和高度时,这才有效。
目标# { 位置:固定; 顶部:calc(50vh - 100px/2); 左:calc(50vw - 200px/2); 宽度:200 px; 身高:100 px; 背景颜色:红色; } < div id = '目标' > < / div >
position: absolute;
left: 50%;
top: 50%;
-webkit-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
解释:
给它一个绝对定位(父元素应该有相对定位)。然后,左上角被移动到中心。因为你还不知道宽度/高度,所以你使用css transform来转换相对于中间的位置。平移(-50%,-50%)会将左上角的x和y位置降低50%的宽度和高度。
我会使用translate:
首先,将div的左上角定位在页面的中心(使用位置:固定;上图:50%;左:50%)。然后,translate将其向上移动50%的div高度,使其在页面上垂直居中。最后,translate还将div向右移动50%的宽度,使其水平居中。
实际上,我认为这个方法比其他许多方法更好,因为它不需要对父元素进行任何更改。
在某些情况下,Translate比translate3d更好,因为它被更多的浏览器支持。https://caniuse.com/#feat=transforms2d
综上所述,所有版本的Chrome、Firefox 3.5+、Opera 11.5+、所有版本的Safari、IE 9+和Edge都支持此方法。
.centered { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); -webkit-transform: translate(-50%, -50%); -moz-transform: translate(-50%, -50%); -o-transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); font-size: 20px; background-color: cyan; border: darkgreen 5px solid; padding: 5px; z-index: 100; } table { position: absolute; top: 0; left: 0; } td { position: relative; top: 0; left: 0; } <table> <tr> <td> <div class="centered">This div<br />is centered</div> <p> Lorem ipsum dolor sit amet, nam sint laoreet at, his ne sumo causae, simul decore deterruisset ne mel. Exerci atomorum est ut. At choro vituperatoribus usu. Dico epicurei persequeris quo ex, ea ius zril phaedrum eloquentiam, duo in aperiam admodum fuisset. No quidam consequuntur usu, in amet hinc simul eos. Ex soleat meliore percipitur mea, nihil omittam salutandi ut eos. Mea et impedit facilisi pertinax, ea viris graeci fierent pri, te sonet intellegebat his. Vis denique albucius instructior ad, ex eum iudicabit elaboraret. Sit ea intellegam liberavisse. Nusquam quaestio maiestatis ut qui, eam decore altera te. Unum cibo aliquip ut qui, te mea doming prompta. Ex rebum interesset nam, te nam zril suscipit, qui suavitate explicari appellantur te. Usu brute corpora mandamus eu. Dicit soluta his eu. In sint consequat sed, quo ea tota petentium. Adhuc prompta splendide mel ad, soluta delenit nec cu. </p> </td> <td> <p> Lorem ipsum dolor sit amet, dico choro recteque te cum, ex omnesque consectetuer sed, alii esse utinam et has. An qualisque democritum usu. Ea has habeo labores, laoreet intellegat te mea. Eius equidem inermis vel ne. Ne eum sonet labitur, nec id natum munere. Primis graecis est cu, quis dictas eu mea, eu quem offendit forensibus nec. Id animal mandamus his, vis in sonet tempor luptatum. Ne civibus oporteat comprehensam vix, per facete discere atomorum eu. Mucius probatus volutpat sit an, sumo nominavi democritum eam ut. Ea sit choro graece debitis, per ex verear voluptua epicurei. Id eum wisi dicat, ea sit velit doming cotidieque, eu sea amet delenit. Populo tacimates dissentiunt has cu. Has wisi hendrerit at, et quo doming putent docendi. Ea nibh vide omnium usu. </p> </td> </tr> </table>
但是,请注意,该方法使该div在页面滚动时停留在一个位置。这可能是你想要的,但如果不是,还有另一种方法。
现在,如果我们尝试相同的CSS,但将位置设置为绝对,它将在最后一个具有绝对位置的父元素的中心。
.centered { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); -webkit-transform: translate(-50%, -50%); -moz-transform: translate(-50%, -50%); -o-transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); font-size: 20px; background-color: cyan; border: darkgreen 5px solid; padding: 5px; z-index: 100; } table { position: absolute; top: 0; left: 0; } td { position: relative; top: 0; left: 0; } <table> <tr> <td> <div class="centered">This div<br />is centered</div> <p> Lorem ipsum dolor sit amet, nam sint laoreet at, his ne sumo causae, simul decore deterruisset ne mel. Exerci atomorum est ut. At choro vituperatoribus usu. Dico epicurei persequeris quo ex, ea ius zril phaedrum eloquentiam, duo in aperiam admodum fuisset. No quidam consequuntur usu, in amet hinc simul eos. Ex soleat meliore percipitur mea, nihil omittam salutandi ut eos. Mea et impedit facilisi pertinax, ea viris graeci fierent pri, te sonet intellegebat his. Vis denique albucius instructior ad, ex eum iudicabit elaboraret. Sit ea intellegam liberavisse. Nusquam quaestio maiestatis ut qui, eam decore altera te. Unum cibo aliquip ut qui, te mea doming prompta. Ex rebum interesset nam, te nam zril suscipit, qui suavitate explicari appellantur te. Usu brute corpora mandamus eu. Dicit soluta his eu. In sint consequat sed, quo ea tota petentium. Adhuc prompta splendide mel ad, soluta delenit nec cu. </p> </td> <td> <p> Lorem ipsum dolor sit amet, dico choro recteque te cum, ex omnesque consectetuer sed, alii esse utinam et has. An qualisque democritum usu. Ea has habeo labores, laoreet intellegat te mea. Eius equidem inermis vel ne. Ne eum sonet labitur, nec id natum munere. Primis graecis est cu, quis dictas eu mea, eu quem offendit forensibus nec. Id animal mandamus his, vis in sonet tempor luptatum. Ne civibus oporteat comprehensam vix, per facete discere atomorum eu. Mucius probatus volutpat sit an, sumo nominavi democritum eam ut. Ea sit choro graece debitis, per ex verear voluptua epicurei. Id eum wisi dicat, ea sit velit doming cotidieque, eu sea amet delenit. Populo tacimates dissentiunt has cu. Has wisi hendrerit at, et quo doming putent docendi. Ea nibh vide omnium usu. </p> </td> </tr> </table>