在可变宽度容器内正确居中多个可变宽度子节点

时间：2015-05-29 14:23:14

标签： html css

我已将this code的简化版复制到jsFiddle。

代码用于使用HTML和CSS编写的树形图。上面的jsFiddle看起来不错。

然而，在玩完之后我发现，如果孩子的大小与父母相同或大于父母，那么节点相对于父母的居中只会真正起作用。

我仍然是css的新手，但主要问题似乎是所有 <li>元素都被浮动了。

考虑this example，其中孩子比其父母小得多。由于父<li>向左浮动，因此子<li>也会向左浮动。

我该如何解决这个问题？

2 个答案:

答案 0 :(得分：3)

我认为将display设置为table和inline-table可能有所帮助。 将display:inline-table设置为ul元素，将display:table设置为与margin: 0 auto结合使用的所有锚标记似乎都有效。 

/*Now the CSS*/
* {margin: 0; padding: 0;}

.tree ul {
	padding-top: 20px; position: relative;
	display: inline-table;
	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;
	text-align:center;
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
    display: list-item;
}

/*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: table;
    margin: 0 auto;
	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;
}
<div class="tree">
    <ul>
        <li>
            <a href="#">Parent</a>
            <ul>
                <li>
                    <a href="#">Child</a>
                    <ul>
                        <li>
                            <a href="#">+</a>
                        </li>
                    </ul> 
                </li>
                <li>
                    <a href="#">Child that is big</a>
                    <ul>
                        <li>
                            <a href="#">+</a>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="#">Child that is even bigger</a>
                    <ul>
                        <li>
                            <a href="#">+</a>
                            <ul>
                                <li>
                                    <a href="#">Lorem ipsum</a>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="#">Child that is big</a>
                    <ul>
                        <li>
                            <a href="#">+</a>
                            <ul>
                                <li>
                                    <a href="#">Lorem ipsum dolor sit amet</a>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>      
            </ul>
        </li>
    </ul>
</div>

希望这有帮助。

答案 1 :(得分：1)

使用此：

body {text-align: center;}
.tree {overflow: hidden; display: inline-block;}

预览

/*Now the CSS*/
* {margin: 0; padding: 0;}

body {text-align: center;}
.tree {overflow: hidden; display: inline-block;}

.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;
	text-align:center;
	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;
}
<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>
					</ul>
				</li>
                <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>
					</ul>
				</li>      
			</ul>
		</li>
	</ul>
</div>

小提琴：https://jsfiddle.net/praveenscience/4jytw9hx/

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