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css determines the number of child elements
- php中世界最好的语言Original
- 2018-03-20 14:12:318120browse
This time I will bring you css to determine the number of sub-elements. What are the precautions for css to determine the number of sub-elements? The following is a practical case, let’s take a look.
I encountered such a problem while working: setting different styles according to the number of sub-elements contained in an element. This can be solved with js, but I personally think it may be easier to solve with css. This also just deepens my understanding and application ofcss selector. Demo is as follows:
##Rendering As follows
The complete code is as follows:
<!DOCTYPE html>
<html>
<head>
<title>css3</title>
<style type="text/css">
*{
box-sizing:border-box;
}
ul{
width:100%;
margin:0;
padding:0;
font-size: 0;
}
li{
margin:0;
padding:0;
display:inline-block;
vertical-align: top;
font-size: 13px;
border:1px solid red;
height:30px;
}
/*ul只有一个子元素的样式*/
li:nth-last-child(1):first-child{
width:100%;
}
/*ul有2个子元素的样式*/
/*li:nth-last-child(2):first-child, 是倒数第二个元素，又是第一个元素，说明li的父元素ul有2个子元素（起到了 判断某父元素下有几个子元素 的作用）*/
li:nth-last-child(2):first-child,
/* ~ 选择位于li:nth-last-child(2):first-child 即 第一个子元素之后的元素*/
li:nth-last-child(2):first-child ~ li{
width:calc(100% / 2);
}
/*ul有3个子元素的样式*/
/*第一个元素宽度为1/3，字体颜色为蓝色*/
li:nth-last-child(3):first-child{
width:calc(100% / 3);
color:blue;
}
/*第一个元素之后的第一个元素（即 有3个子元素的ul 的 第 3 个元素）*/
li:nth-last-child(3):first-child ~ li:nth-last-child(1){
width:calc(100% / 4);
color:red;
}
/*第一个元素之后的第一个元素（即 有3个子元素的ul 的 第 2 个元素）*/
li:nth-last-child(3):first-child ~ li:nth-last-child(2){
width:calc(100% / 6);
color:yellow;
}
</style>
</head>
<body>
<ul class="list">
<li>11111</li>
</ul>
<ul class="list">
<li>11111</li>
<li>22222</li>
</ul>
<ul class="list">
<li>11111</li>
<li>22222</li>
<li>33333</li>
</ul>
</body>
</html>
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!
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