WEB技术分享

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;
}

要过大年了，祝愿关注Helloweba的朋友新的一年里身体健康，工作顺利！