垂直对齐绝对定位

Question

在下面的代码中,我试图使绿色div.middle元素中的元素垂直对齐到中间.

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我尝试了表格单元格方法,但无法使其正常工作.我听说这是由于绝对定位并尝试了这个解决方案没有运气: CSS - 垂直对齐表格单元格无法使用绝对位置

这似乎是由于.table-cell没有高度 - 我希望它的高度等于其父容器,其高度不同.

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的jsfiddle:

http://jsfiddle.net/q5jKM/1/

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有没有人知道让绿色div.middle元素垂直对齐到中间的方法？任何方法都可以.它只需要能够处理其可变高度.只用css是否可能？或者我是否必须加入一些jQuery？

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编辑:

box-align也不是一个可行的解决方案,因为浏览器支持并被新标准取代.

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CSS

     html,body{height:100%;margin:0}
#sidebar {
    width: 22em;
    position:fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index:2;
    color: #ffffff;
    background-color: #333333;  
    overflow:auto;
    height: 100%;
}

#sidebar .nav {
    width: 3em;
    float: right;
    background-color: #2e2e2e;
    border-left: 2px groove #454545;
    height: 100%;
    position:relative;
    min-height:34em;    
}

#sidebar .content {
    height: 100%; 
    width: 16.875em; /*    17-(2/16)   - 20em - .nav - nav border*/
    float:left; 
    position:relative;
    min-height:34em;
}

#sidebar .top {
    position:absolute;
    top:0;
}
#sidebar .bottom {
    position:absolute;
    bottom:0;
}

#sidebar .middle {
    position: absolute;
    bottom: 12em;       /*  3.125*3  */
    top: 16em;          /*  3.125*4  */
    background: green;
}

.content .middle {
    overflow:auto;
}


#sidebar .content > div {width: 16.875em; } /*.top .middle .bottom*/
#sidebar .nav > div {width:3em; } /*.top .middle .bottom*/


    /*table-cell trying get vertical-align working*/
#sidebar .table-cell {display:table-cell; vertical-align: middle; }



#sidebar .content p, #sidebar .content li, #sidebar .content img {font-size: .75em; color: #dddddd;}

#sidebar ul {margin:0; padding: 0;}









#sidebar .nav li {
    padding: .5625em;
    list-style:none;
}
#sidebar .nav li img {
    height: 1.875em;
    width: 1.875em
}

#sidebar .nav .top li { border-bottom: 2px groove #454545 }
#sidebar .nav .bottom li { border-top:  2px groove #454545 }




.content li {
    position:relative;
    display:block;
    background-color: #444;
    padding: .72em;
    border-radius: .8em;
    border-bottom: 1px solid #292929;
    border-top: 1px solid #4c4c4c;
    text-align: center;
    font-size: 1em;
    letter-spacing: .1em;
    font-weight: normal;
    height: 1.2em;
}

.content li:after {
    content:"";
    position:absolute;
    display:block; 
    width:0;
    top:.11em; /* controls vertical position */
    right:-.852em; /* value = - border-left-width - border-right-width */
    border-style:solid;
    border-width:1.2em 0 1.2em 1.2em;
    border-color:transparent #444;
}

.content .top li{margin: .95em 0 1.9em 0;}
.content .bottom li{margin: 1.9em 0 .95em 0;}

.content .logo {
    text-align: center;
    padding: 1em 0 2em 0;
    width: 100%;
    border-bottom: 2px groove #454545;
}
.content p.welcome {
    text-align: center;
    line-height: 1.5em;
    margin: 1em 0;
}

HTML

<div id="sidebar">


            <div class="nav">
            <div class="top">
            <ul>
                <li><img src="_images/attributes/attribute2.svg"></li>
                <li><img src="_images/attributes/attribute2.svg"></li>
                <li><img src="_images/attributes/attribute2.svg"></li>
                <li><img src="_images/attributes/attribute2.svg"></li>
            </ul>
            </div>
            <div class="middle"><div class="table-cell"><p>test</p></div></div>
            <div class="bottom">
            <ul>
                <li><img src="_images/attributes/attribute2.svg"></li>
                <li><img src="_images/attributes/attribute2.svg"></li>
                <li><img src="_images/attributes/attribute2.svg"></li>
            </ul>
            </div>
            </div>



            <div class="content">
                <div class="top">
                <ul>
                    <li>SIDEBAR LINK</li>
                    <li>SIDEBAR LINK</li>
                    <li>SIDEBAR LINK</li>
                    <li>SIDEBAR LINK</li>
                </ul>
                </div>
                <div class="middle"><div class="table-cell">
                <div class="logo"><img src="_images/g.svg"></div>
                <p class="welcome">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris dictum tellus viverra neque bibendum in mattis ante dignissim. Nam mattis feugiat lorem porttitor adipiscing. Aliquam erat volutpat. Nunc feugiat magna vitae mauris egestas euismod. In hac habitasse platea dictumst. Praesent magna sem, malesuada non fermentum vel, luctus quis mauris. Duis quam purus, ornare vitae eleifend sed, malesuada eget libero. Phasellus sed lorem risus, nec placerat urna. In magna turpis, accumsan ac egestas quis, dictum vel massa. Nulla vitae magna arcu. Maecenas sit amet vestibulum urna. Integer feugiat dignissim leo sed ornare. Maecenas auctor ultricies dui, pulvinar tincidunt velit feugiat quis. Sed egestas ornare elit, et fringilla quam viverra ut.</p>
                </div></div>
                <div class="bottom">
                <ul>
                    <li>SIDEBAR LINK</li>
                    <li>SIDEBAR LINK</li>
                    <li>SIDEBAR LINK</li>
                </ul>
                </div>
                </div>
    </div>

Answer 1

添加父DIV与 display:table和height:100%到.table-cell会解决此问题

所以html结构将是:

   <div class="middle">
        <div class="table">
           <div class="table-cell">
               <p>test</p>
           </div>
        </div>    
  </div>

添加此样式:

#sidebar .table{
   display:table;
   height:100%;
}

见jsfiddle我修改过