面向对象实例-实现Tab选项卡的增删改功能

前言

今天主要就是使用面向对象的思想来简单实现下tab选项卡功能。

具体代码实现如下:


<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>使用类-编写选项卡实例title>
  <style>
    * {
      
      padding: 0;
      margin: 0;
    }
    ul li {
      
      list-style: none;
    }
    .tab {
      
      width: 100%;
      height: 500px;
      border: 1px solid #aaa;
    }
    .tab-top, .tab-list {
      
      display: flex;
      align-items: center;
      justify-content: start;
    }
    .tab-list li {
      
      position: relative;
      padding: 5px 30px;
      background-color: #aaa;
    }
    .tab-list li.active {
      
      background-color: white;
    }
    .tab-list li .remove{
      
      position: absolute;
      top: 5px;
      right: 5px;
      width: 16px;
      height: 16px;
      font-weight: normal;
      text-align: center;
      line-height: 16px;
      background-color: #ddd;
      border-radius: 50%;
      cursor: pointer;
    }
    .tab-add {
      
      padding: 5px 30px;
      cursor: pointer;
    }
    .tab-content section{
      
      padding: 10px;
      height: 200px;
      display: none;
    }
    .tab-content section.active {
      
      display: block;
    }
  style>
head>
<body>
  <div id="tab">
    <div class="tab-top">
      <ul class="tab-list">
        <li>
          <span>语文span>
          <b class="remove">xb>
        li>
        <li class="active">
          <span>数学span>
          <b class="remove">xb>
        li>
        <li>
          <span>英语span>
          <b class="remove">xb>
        li>
      ul>
      <div class="tab-add">+div>
    div>
    <div class="tab-content">
      <section>语文内容section>
      <section class="active">数学内容section>
      <section>英语内容section>
    div>

  div>

  <script>
    class Tab {
      
      constructor(mainId) {
      
      	// constructor 里面的this 指向的是 创建的实例对象
        this.mainTab = document.querySelector(`#${
        mainId}`)
        this.tabUl = this.mainTab.querySelector('.tab-list')
        this.addBtn = this.mainTab.querySelector('.tab-add')
        this.tabContent = this.mainTab.querySelector('.tab-content')
        this.init()
      }
      // 初始化
      init() {
      
        this.updateNode()
        this.addBtn.onclick = this.addTab.bind(this)
        for(let i=0; i<this.tabLis.length; i++) {
      
          this.tabLis[i].index = i
          this.tabLis[i].onclick = this.toggleTab.bind(this.tabLis[i], this)
          this.removeBtn[i].onclick = this.removeTab.bind(this.removeBtn[i], this)
          this.texts[i].ondblclick = this.editTab
          this.tabSections[i].ondblclick = this.editTab
        }
      }
      // 动态更新节点 新增和删除需要
      updateNode() {
      
        this.tabLis = this.mainTab.querySelectorAll('.tab-list li')
        this.texts = this.mainTab.querySelectorAll('.tab-list li span')
        this.tabSections = this.tabContent.querySelectorAll('section')
        this.removeBtn = this.mainTab.querySelectorAll('.tab-list li .remove')
      }
      // 切换
      toggleTab(_this) {
      
        _this.clearClassName()
        this.className = 'active'
        _this.tabSections[this.index].className = 'active'
      }
      // 清空选中状态
      clearClassName() {
      
        for(let i=0; i<this.tabLis.length; i++) {
      
          this.tabLis[i].className = ''
          this.tabSections[i].className = ''
        }
      }
      // 添加
      addTab() {
      
        this.clearClassName()
        let random = Math.random()
        let li = `
  • 新选项卡x
  • `
    let section = `
    新选项卡${ random}内容
    `
    this.tabUl.insertAdjacentHTML('beforeend', li) this.tabContent.insertAdjacentHTML('beforeend', section) this.init() } // 移除 removeTab(_this, e) { // 阻止冒泡 e.stopPropagation() let index = this.parentNode.index _this.tabLis[index].remove() _this.tabSections[index].remove() _this.init() if(_this.mainTab.querySelector('.active')) return index > 0 ? index-- : index _this.tabLis[index] && _this.tabLis[index].click() } // 编辑 editTab() { let str = this.innerHTML // 双击禁止选定文字 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); this.innerHTML = `` let input = this.children[0] input.value = str // 选中文本框的值 input.select() // 失去焦点的时候 将输入框的值给span input.onblur = function() { this.parentNode.innerHTML = this.value } input.onkeyup = function(e) { if(e.keyCode === 13) this.blur() } } } // 实例化对象 let tab = new Tab('tab')
    script> body> html>

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