[英]How to get a tree in HTML using pure CSS
这是尝试仅使用伪元素和边框:
ul, li{
position: relative;
}
/* chop off overflowing lines */
ul{
overflow: hidden;
}
li::before, li::after{
content: '';
position: absolute;
left: 0;
}
/* horizontal line on inner list items */
li::before{
border-top: 1px solid #333;
top: 10px;
width: 10px;
height: 0;
}
/* vertical line on list items */
li::after{
border-left: 1px solid #333;
height: 100%;
width: 0px;
top: -10px;
}
/* lower line on list items from the first level
because they don't have parents */
.tree > li::after{
top: 10px;
}
/* hide line from the last of the first level list items */
.tree > li:last-child::after{
display:none;
}
演示 (编辑)
遗憾的是,伪类在即将发布的CSS3规范中定义,目前很少有Web浏览器支持它。
它是在教程结束时编写的。 也许这就是它不起作用的原因。
我相信我已修好它: https : //github.com/gurjeet/CSSTree/pull/1
我修改了CSS以删除背景并将边距更改为填充。
ul.tree, ul.tree ul {
list-style-type: none;
margin:0;
padding:0;
}
ul.tree ul {
padding-left: 1em;
background: url(vline.png) repeat-y;
}
ul.tree li {
margin:0;
padding: 0 1.2em;
line-height: 20px;
background: url(node.png) no-repeat;
color: #369;
font-weight: bold;
}
/* The #fff color background is to hide the previous background image*/
ul.tree li.last {
background: #fff url(lastnode.png) no-repeat;
}
ul.tree ul:last-child {
background: none;
}
谢谢大家,有用的答案让我读了更多,最后我读了这篇文章并删除了对JavaScript的所有依赖,并使用nth-last-of-type
伪选择器将特殊背景应用于最后的li项目列表(忽略最后一个li之后的ul)。
最终的代码在这里 。 我会接受我自己的答案,除非有人指出它有些问题。 (在这个阶段,我认为与旧浏览器的兼容性并不重要。)
感谢@Aram的回答。 @OneTrickPony,你的答案超过了这个菜鸟头:)我确信它做对了,但对我来说有点太复杂了。
<style type="text/css">
/* ul[class=tree] and every ul under it loses all alignment, and bullet
* style.
*/
ul.tree, ul.tree ul {
list-style-type: none;
margin:0;
padding:0;
}
/* Every ul under ul[class=tree] gets an indent of 1em, and a background
* image (vertical line) applied to all nodes under it (repeat-y)
*/
ul.tree ul {
padding-left: 1em;
background: url(vline.png) repeat-y;
}
/* ... except the last ul child in every ul; so no vertical lines for
* the children of the last ul
*/
ul.tree ul:last-child {
background: none;
}
/* Every li under ul[class=tree]
* - gets styling to make it bold and blue, and indented.
* - gets a background image (tilted T), to denote that its a node
* - sets height to match the height of background image
*/
ul.tree li {
margin:0;
padding: 0 1.2em;
background: url(node.png) no-repeat;
line-height: 20px;
color: #369;
font-weight: bold;
}
/* The last li gets a different background image to denote it as the
* end of branch
*/
ul.tree li:nth-last-of-type(1) {
background: url(lastnode.png) no-repeat;
}
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