纯CSS打造的Family tree（族谱）

HTML

我们使用div#tree来包含整个族谱结构，内部以ul和li元素构建数据源。实际开发中这些族谱数据源可以从数据库中读取，就像得到一个无限级的分类列表，以下是主要的html结构。

<div class="tree"> 
    <ul> 
        <li> 
            <a href="#">Parent</a> 
            <ul> 
                <li> 
                    <a href="#">Child</a> 
                    <ul> 
                        <li><a href="#">Grand Child</a></li> 
                    </ul> 
                </li> 
                <li> 
                    <a href="#">Child</a> 
                    <ul> 
                        <li><a href="#">Grand Child</a></li> 
                        <li> 
                            <a href="#">Grand Child</a> 
                            <ul> 
                                <li><a href="#">Great Grand Child</a></li> 
                                <li><a href="#">Great Grand Child</a></li> 
                                <li><a href="#">Great Grand Child</a></li> 
                            </ul> 
                        </li> 
                        <li><a href="#">Grand Child</a></li> 
                    </ul> 
                </li> 
            </ul> 
        </li> 
    </ul> 
</div>

CSS

我们使用css中的 :before、:after 两个伪类的content属性来构建元素间的连接线，同时使用了css3实现元素的圆角效果，并加上了鼠标滑上hover效果，这样鼠标滑向族谱中的一个 节点元素，与之相关的后辈元素都会有hover效果，完整的css代码如下：

.tree ul { 
    padding-top: 20px; position: relative; 
     
    transition: all 0.5s; 
    -webkit-transition: all 0.5s; 
    -moz-transition: all 0.5s; 
} 
 
.tree li { 
    float: left; text-align: center; 
    list-style-type: none; 
    position: relative; 
    padding: 20px 5px 0 5px; 
     
    transition: all 0.5s; 
    -webkit-transition: all 0.5s; 
    -moz-transition: all 0.5s; 
} 
 
/*We will use ::before and ::after to draw the connectors*/ 
 
.tree li::before, .tree li::after{ 
    content: ''; 
    position: absolute; top: 0; right: 50%; 
    border-top: 1px solid #ccc; 
    width: 50%; height: 20px; 
} 
.tree li::after{ 
    right: auto; left: 50%; 
    border-left: 1px solid #ccc; 
} 
 
/*We need to remove left-right connectors from elements without  
any siblings*/ 
.tree li:only-child::after, .tree li:only-child::before { 
    display: none; 
} 
 
/*Remove space from the top of single children*/ 
.tree li:only-child{ padding-top: 0;} 
 
/*Remove left connector from first child and  
right connector from last child*/ 
.tree li:first-child::before, .tree li:last-child::after{ 
    border: 0 none; 
} 
/*Adding back the vertical connector to the last nodes*/ 
.tree li:last-child::before{ 
    border-right: 1px solid #ccc; 
    border-radius: 0 5px 0 0; 
    -webkit-border-radius: 0 5px 0 0; 
    -moz-border-radius: 0 5px 0 0; 
} 
.tree li:first-child::after{ 
    border-radius: 5px 0 0 0; 
    -webkit-border-radius: 5px 0 0 0; 
    -moz-border-radius: 5px 0 0 0; 
} 
 
/*Time to add downward connectors from parents*/ 
.tree ul ul::before{ 
    content: ''; 
    position: absolute; top: 0; left: 50%; 
    border-left: 1px solid #ccc; 
    width: 0; height: 20px; 
} 
 
.tree li a{ 
    border: 1px solid #ccc; 
    padding: 5px 10px; 
    text-decoration: none; 
    color: #666; 
    font-family: arial, verdana, tahoma; 
    font-size: 11px; 
    display: inline-block; 
     
    border-radius: 5px; 
    -webkit-border-radius: 5px; 
    -moz-border-radius: 5px; 
     
    transition: all 0.5s; 
    -webkit-transition: all 0.5s; 
    -moz-transition: all 0.5s; 
} 
 
/*Time for some hover effects*/ 
/*We will apply the hover effect the the lineage of the element also*/ 
.tree li a:hover, .tree li a:hover+ul li a { 
    background: #c8e4f8; color: #000; border: 1px solid #94a0b4; 
} 
/*Connector styles on hover*/ 
.tree li a:hover+ul li::after,  
.tree li a:hover+ul li::before,  
.tree li a:hover+ul::before,  
.tree li a:hover+ul ul::before{ 
    border-color:  #94a0b4; 
}

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