原生JavaScript写出Tabs标签页
最近在重新学习JavaScript，手写了一个tabs标签页。
话不多说，直接开始。
首先，是前端页面。
图1 tabs
先来把tabs分解一下：
图2 tabs分解
首先，一个大的框div，上面红色的框是导航栏nav，导航栏里是一个无序列表ul，里面三个li标签（黄色的框），li标签里两个绿色标签是两个span，一个用来放导航的名字，一个用来放导航关闭的icon，右边是一个button，用来添加新的导航栏及内容；下方是导航栏的内容section。
导航tabs.html代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<main>
<div class="tabsbox" id="tab">
<!-- tab标签 -->
<nav class="firstnav">
<ul>
<li class="liactive"><span>测试1</span><span class="icon-guanbi">X</span></li>
<li><span>测试2</span><span class="icon-guanbi">X</span></li>
<li><span>测试3</span><span class=" icon-guanbi">X</span></li>
</ul>
<div class="tabadd">
<span>+</span>
</div>
</nav>
<!-- tab内容 -->
<div class="tabscon">
<section class="conactive">测试内容1</section>
<section>测试内容2</section>
<section>测试内容3</section>
</div>
</div>
</main>
<script src="js/tabs.js"></script>
</body>
</html>
<style>
* {
margin: 0;
padding: 0;
}
ul li {
list-style: none;
}
main {
width: 960px;
height: 500px;
border-radius: 10px;
margin: 50px auto;
}
main h4 {
height: 100px;
line-height: 100px;
text-align: center;
}
.tabsbox {
width: 900px;
margin: 0 auto;
height: 400px;
border: 1px solid lightsalmon;
position: relative;
}
nav ul {
overflow: hidden;
}
nav ul li {
float: left;
width: 100px;
height: 50px;
line-height: 50px;
text-align: center;
border-right: 1px solid #ccc;
position: relative;
}
nav ul li.liactive {
border-bottom: 2px solid #fff;
z-index: 9;
}
#tab input {
width: 80%;
height: 60%;
}
nav ul li span:last-child {
position: absolute;
user-select: none;
font-size: 12px;
top: -18px;
right: 0;
display: inline-block;
height: 20px;
}
.tabadd {
position: absolute;
/* width: 100px; */
top: 0;
right: 0;
}
.tabadd span {
display: block;
width: 20px;
height: 20px;
line-height: 20px;
text-align: center;
border: 1px solid #ccc;
float: right;
margin: 10px;
user-select: none;
}
.tabscon {
width: 100%;
height: 300px;
position: absolute;
padding: 30px;
top: 50px;
left: 0px;
box-sizing: border-box;
border-top: 1px solid #ccc;
}
.tabscon section,
.tabscon section.conactive {
display: none;
width: 100%;
height: 100%;
}
.tabscon section.conactive {
display: block;
}
</style>
由于给导航栏增删查改的js代码很多，我单独用一个js文件写tabs.js，在tabs.html里引用就行。
实现的导航栏功能有：
1）导航栏的切换功能
2）增加导航栏的功能
3）删除导航栏的功能
tabs.js代码如下：
1 var that;
2 class Tab {
3 constructor(id){
4 that = this;
5 //获取元素
6 this.main = document.querySelector(id);
7
8 this.add = this.main.querySelector('.tabadd');
9 //li的父元素
10 this.ul = this.main.querySelector('.firstnav ul:first-child');
11 //section的父元素
12 this.fsection = this.main.querySelector('.tabscon');
13 this.init();
14 }
15 //初始化操作
16 init(){
17 this.updateNode();
18 this.add.onclick = this.addTab;
19 for(let i = 0;i<this.lis.length;i++){
20 this.lis[i].index = i;
21 this.lis[i].onclick = this.toggleTab;
22 this.remove[i].onclick = this.removeTab;
23 this.spans[i].ondblclick = this.editTab;
24 this.sections[i].ondblclick = this.editTab;
25 }
26 }
27 //获取li跟section
28 updateNode(){
29 this.lis = this.main.querySelectorAll('li');
30 this.sections = this.main.querySelectorAll('section');
31 this.remove = this.main.querySelectorAll('.icon-guanbi');
32 this.spans = this.main.querySelectorAll('.firstnav li span:first-child')
33 }
34 //1.切换功能
35 toggleTab(){
36
37 that.clearClass();
38 this.className = 'liactive';
39 that.sections[this.index].className = 'conactive';
40 }
41 clearClass(){
42 for(let i = 0;i<this.lis.length;i++){
43 this.lis[i].className = '';
44 this.sections[i].className = '';
45 }
46 }
47 //2.添加功能
48 addTab(){
49 that.clearClass();
50 //1)添加li元素和section
51 var random = Math.random()
52 var li = '<li class="liactive"><span>新选项卡</span><span class="iconfont icon-guanbi">X</span></li>';
53 var section = '<section class="conactive">'+random+'</section>';
54
55 //2）把两个元素添加到对应的父级元素中
56 that.ul.insertAdjacentHTML('beforeend',li);
57 that.fsection.insertAdjacentHTML('beforeend',section);
58 that.init();
59 }
60 //3.删除功能
61 removeTab(e){
62 e.stopPropagation();
63 var index = this.parentNode.index;
64 console.log(index);
65 //删除对应节点
66 that.lis[index].remove();
67 that.sections[index].remove();
68 //删除后及时更新页面中的节点
69 that.init();
70 //如果当前页面有选中状态，就不用执行下面的步骤
71 if(document.querySelector('.liactive')) return;
72 //让index前一个处于选中状态
73 index--;
74 that.lis[index] && that.lis[index].click();
75 }
76 //4.修改功能
77 editTab(){
78 let str = this.innerHTML;
79 // console.log(str);
80 //禁止双击选中文字
81 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
82 this.innerHTML='<input type="text">'
83 let input = this.children[0];
84 input.value = str;
85 input.select();
86 //input失去焦点后变回span
87 input.onblur = function(){
88 this.parentNode.innerHTML= this.value;
89 }
90 //按回车也能
91 input.onkeyup = function(e){
92 if(e.keyCode == 13){
93 this.blur();//获得焦点
94 }
95
96 }
97
98 }
99 }
100 new Tab('#tab');
101 // tab.init();
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