如何保持div包含在视口中,同时保持宽高比 [英] How to keep a div contained within the viewport whilst maintaining aspect ratio
问题描述
存在一个方形的div,它是一个任意百分比宽度(和相同的高度),需要与窗口缩放。
它必须在边界内的视口(即:不剪切外部)并保持其正方形形状 - 本质上重复了CSS的 background-size:contains;
特征。
我需要支持iOS Safari v3.2,所以我不能使用 vw / vh / vmin / vmax
/ em>更喜欢仅使用CSS的解决方案。
您可以使用
:后设置在CSS
DEMO http:// jsfiddle。 net / kevinPHPkevin / 5tzk3 / 307 /
.wrapper:after {
padding-top:100 %; / *设置比率* /
display:block;
content:'';
}
说明:
这是通过插入: c>,然后给div一个填充顶部100%,因此推动div的底部下来工作。如果你把它改成,例如 padding-top:56.25%;
它将给出一个16:9的比率。填充不会干扰div的内容,因为:之后只插入:在此元素内将受到影响。在这种情况下,没有任何元素使用:之后
,因为你总是使用一个新的div的效果。
已编辑
:
DEMO http://jsfiddle.net/kevinPHPkevin/5tzk3/309/
停止扩展超出点设置 max-width
和 max-height
.wrapper {
width:50%;
display:inline-block;
position:relative;
max-height:350px;
max-width:350px;
}
There exists a square div that is an arbitrary percent wide (and the same amount high) that needs to scale with the window.
It must stay within the bounds of the viewport (ie: not clipping outside) and maintain its square shape - essentially duplicating the background-size: contain;
feature of CSS.
I need to support iOS Safari v3.2, so I can't use vw/vh/vmin/vmax
and would strongly prefer a CSS-only solution.
解决方案 You can set it using :after
in CSS
DEMO http://jsfiddle.net/kevinPHPkevin/5tzk3/307/
.wrapper:after {
padding-top: 100%; /*Sets ratio*/
display: block;
content: '';
}
Explanation:
This works by inserting no content :after
and then giving the div a padding top of 100%, thus pushing the bottom of the div down. If you change it to, say, padding-top: 56.25%;
it would give a 16:9 ratio. The padding does not interfere with the content of the div as it is inserted :after
and only elements that are associated with :after
within this element would be affected. In this case there are no elements that use :after
as you'd always use a new div for this effect.
Edited
DEMO http://jsfiddle.net/kevinPHPkevin/5tzk3/309/
to stop it expanding beyond a point set a max-width
and max-height
.wrapper {
width: 50%;
display: inline-block;
position: relative;
max-height:350px;
max-width:350px;
}
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