CSS solves unknown height vertical centering

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CSS solves unknown height vertical centering_CSS/HTML

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May 16, 2016 pm 12:12 PM

Although there is CSS vertical-align feature, it cannot effectively solve the vertical centering problem of unknown height (when there is text or image of unknown height in a DIV tag).

For standard browsers such as Mozilla, Opera, Safari, etc., you can set the display mode of the parent element to TABLE (display: table;) and the internal child elements to table-cell (display: table-cell ), using the vertical-align feature to vertically center it, but non-standard browsers do not support it.

Non-standard browsers can only set the child element to be 50% from the top, and then add an element inside to offset it by -50% from the top.

Copy code The code is as follows:

body {padding: 0; margin: 0;} 
body,html{height: 100%;} 
#outer {height: 100%; overflow: hidden; position: relative;width: 100%; background:ivory;} 
#outer[id] { display: table; position: static;} 
#middle {position: absolute; top: 50%;} /* for explorer only*/ 
#middle[id] {display: table-cell; vertical-align : middle; position: static;} 
#inner {position: relative; top: -50%;width: 400px; margin: 0 auto;} /* for explorer only */ 
div.greenBorder {border: 1px solid green; background-color: ivory;}

xhtml

Copy code The code is as follows:

 
                                                                                                                                                        CSS2 selector #value[id] not supported by IE. 

CSS2 selector #value[id] is equivalent to selector #value, but Internet Explorer does not support this type of selector. Likewise, .value[class] is equivalent to .value, which can only be read by standard browsers. 

Test: Firefox1.5, Opera9.0, IE6.0, IE5.0 passed. 






Vertical centering in valid CSS


<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
</title>
  <style type="text/css"> 
body {padding: 0; margin: 0; font-size: 75%; line-height: 140%; font-family:Arial, Helvetica, sans-serif;} 
body,html{height: 100%; } 
a{color: #333;} 
a:hover{color: green;} 
#outer {height: 100%; overflow: hidden; position: relative;width: 100%; background:ivory; } 
#outer[id] {display: table; position: static;} 
#middle {position: absolute; top: 50%;text-align:center;} /* for explorer only*/ 
#middle[id] {display: table-cell; vertical-align: middle; position: static;} 
#inner {position: relative; top: -50%;width: 600px;margin: 0 auto;text-align:left;}/*for explorer only */ 
div.greenBorder {border: 1px solid green; background-color: #FFF;} 
p{margin: 1em;} 
    </style>
    
      <div id="outer">Default length<div id="middle"> <div id="inner" class="greenBorder">Longer page<p><a href="javascript:toggleContent('inner',1)">
      </a> 1. Open Illustrator, create a new file, draw a rectangle, larger than the picture you want to import, and fill it with white. 
 
        2. Select the rectangle, menu: Effect > Distort & Transform > Zig Zag, set as shown below. 
 
        3. Menu: Effect > Stylize > Drop Shadow, set as shown below. 
 
        1. Open Illustrator, create a new file, draw a rectangle, larger than the picture you want to import, and fill it with white. 
 
        2. Select the rectangle, menu: Effect > Distort & Transform > Zig Zag, set as shown below. 
 
        3. Menu: Effect > Stylize > Drop Shadow, set as shown below. <a href="javascript:toggleContent('inner',2)">
      </a>
      Designed by </p>Forestgan<p> This demo is licensed under the </p>Creative Commons License<address style="text-align:center; padding: .5em; clear: left;">--Attribution and non-commercial use. 
      <a href="http://www.forest53.com">
    </a>
  <a href="http://www.creativecommons.cn/">
</a>


<br><input onclick="runEx('runcode63300')" type="button" value="运行代码"> <input onclick="doCopy('runcode63300')" type="button" value="复制代码"> <input onclick="doSave(runcode63300)" type="button" value="保存代码">[Ctrl+A to select all Note: <a href="/article/23421.htm" title="查看具体详情" target="_blank">If you need to introduce external Js, you need to refresh to execute </a>]</address>
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