原生JavaScript寫出Tabs標簽頁的實例代碼
最近在重新學習JavaScript，手寫了一個tabs標簽頁。
話不多說，直接開始。
首先，是前端頁面。
圖1 tabs
先來把tabs分解一下：
圖2 tabs分解
首先，一個大的框div，上面紅色的框是導航欄nav，導航欄里是一個無序列表ul，里面三個li標簽（黃色的框），li標簽里兩個綠色標簽是兩個span，一個用來放導航的名字，一個用來放導航關閉的icon，右邊是一個button，用來添加新的導航欄及內容；下方是導航欄的內容section。
導航tabs.html代碼如下：
<!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 id='tab'> <!-- tab標簽 --> <nav class='firstnav'><ul> <li class='liactive'><span>測試1</span><span class='icon-guanbi'>X</span></li> <li><span>測試2</span><span class='icon-guanbi'>X</span></li> <li><span>測試3</span><span class=' icon-guanbi'>X</span></li></ul><div class='tabadd'> <span>+</span></div> </nav> <!-- tab內容 --> <div class='tabscon'><section class='conactive'>測試內容1</section><section>測試內容2</section><section>測試內容3</section> </div> </div> </main> <script src='http://www.gepszalag.com/bcjs/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>
由于給導航欄增刪查改的js代碼很多，我單獨用一個js文件寫tabs.js，在tabs.html里引用就行。
實現的導航欄功能有：
1）導航欄的切換功能
2）增加導航欄的功能
3）刪除導航欄的功能
tabs.js代碼如下：
var that;class Tab { constructor(id){ that = this; //獲取元素 this.main = document.querySelector(id); this.add = this.main.querySelector(’.tabadd’); //li的父元素 this.ul = this.main.querySelector(’.firstnav ul:first-child’); //section的父元素 this.fsection = this.main.querySelector(’.tabscon’); this.init(); } //初始化操作 init(){ this.updateNode(); this.add.onclick = this.addTab; for(let i = 0;i<this.lis.length;i++){ this.lis[i].index = i; this.lis[i].onclick = this.toggleTab; this.remove[i].onclick = this.removeTab; this.spans[i].ondblclick = this.editTab; this.sections[i].ondblclick = this.editTab; } } //獲取li跟section updateNode(){ this.lis = this.main.querySelectorAll(’li’); this.sections = this.main.querySelectorAll(’section’); this.remove = this.main.querySelectorAll(’.icon-guanbi’); this.spans = this.main.querySelectorAll(’.firstnav li span:first-child’) } //1.切換功能 toggleTab(){ that.clearClass(); this.className = ’liactive’; that.sections[this.index].className = ’conactive’; } clearClass(){ for(let i = 0;i<this.lis.length;i++){ this.lis[i].className = ’’; this.sections[i].className = ’’; } } //2.添加功能 addTab(){ that.clearClass(); //1)添加li元素和section var random = Math.random() var li = ’<li class='liactive'><span>新選項卡</span><span class='iconfont icon-guanbi'>X</span></li>’; var section = ’<section class='conactive'>’+random+’</section>’; //2）把兩個元素添加到對應的父級元素中 that.ul.insertAdjacentHTML(’beforeend’,li); that.fsection.insertAdjacentHTML(’beforeend’,section); that.init(); } //3.刪除功能 removeTab(e){ e.stopPropagation(); var index = this.parentNode.index; console.log(index); //刪除對應節點 that.lis[index].remove(); that.sections[index].remove(); //刪除后及時更新頁面中的節點 that.init(); //如果當前頁面有選中狀態，就不用執行下面的步驟 if(document.querySelector(’.liactive’)) return; //讓index前一個處于選中狀態 index--; that.lis[index] && that.lis[index].click(); } //4.修改功能 editTab(){ let str = this.innerHTML; // console.log(str); //禁止雙擊選中文字 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); this.innerHTML=’<input type='text'>’ let input = this.children[0]; input.value = str; input.select(); //input失去焦點后變回span input.onblur = function(){ this.parentNode.innerHTML= this.value; } //按回車也能 input.onkeyup = function(e){ if(e.keyCode == 13){ this.blur();//獲得焦點 } } }} new Tab(’#tab’);// tab.init();
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