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Detailed explanation of how JavaScript can quickly and dynamically delete and delete dom element code

伊谢尔伦Original: 2017-07-21 09:50:132922browse

In DOM we can easily and quickly dynamically delete and delete dom elements

Example 1:

Dynamicly create a button

<html> 
<head> 
<title>动态创建按钮</title> 
<script language="javascript"> 
var a,b,ab,ba,c;
function createInputA(){
a = document.createElement("input");  //使用DOM的创建元素方法
a.type = "button" ;                       //设置元素的类型
a.value = "按钮A";                     //设置元素的值
a.attachEvent("onclick",addInputB);    //为控件添加事件
document.body.appendChild(a);             //添加控件到窗体中
//a = null;              //释放对象
}

Example 2:

<html>
<head>
<script type="text/javascript">
    function test(){        
        //createElement()  创建一个指定标签名的元素[比如:动态创建超链接]
        var createa=document.createElement("a");
        createa.id="a1";
        createa.innerText="连接到百度";
        createa.href="http://www.jb51.net";
        //createa.color="green" ////添加颜色(不要忘记style属性，不然没有效果)
        createa.style.color="green"
        //添加默认位置--body 并且添加子节点
        //document.body.appendChild(createa);
        //放置指定位置
        document.getElementById("p1").appendChild(createa);
    }
    
    function test2(){
        //指定位置删除节点removeChild()
        document.getElementById("p1").removeChild(document.getElementById("a1")); //id 名重复 js只取第一个
    }
</script>
</head>
<body>
<!--动态创建元素-->
<input type="button" value="创建一个a标签" onclick="test()"/><br/>
<input type="button" value="删除创建一个a标签" onclick="test2()"/>
<p id="p1" style="width:400px;height:300px;border:1px solid silver">
</p>
</body>
</html>

Dynamicly create multiple forms:

<html>
 <head>
  <script type="text/javascript">
   window.onload = function() {
    var aBtn = document.createElement("input");
    var bBtn = document.createElement("input");
    var cBtn = document.createElement("input");
    
    aBtn.type = "button";
    aBtn.value = "按钮A";
    aBtn.onclick = copyBtn;
    
    bBtn.type = "button";
    bBtn.value = "按钮B";
    bBtn.onclick = copyBtn;
    
    cBtn.type = "button";
    cBtn.value = "按钮C";
    cBtn.onclick = clearCopyBtn;
    
    document.body.appendChild(aBtn);
    document.body.appendChild(bBtn);
    document.body.appendChild(cBtn);
   };
   
   function copyBtn() {
    var btn = document.createElement("input");
    btn.type = "button";
    btn.value = this.value;
    btn.isCopy = true;
    btn.onclick = copyBtn;
    document.body.appendChild(btn);
   }
   
   function clearCopyBtn() {
    var btns = document.getElementsByTagName("input");
    var length = btns.length;
    for (var i = length - 1; i >= 0; i--) {
     if (btns[i].isCopy) {
      document.body.removeChild(btns[i]);
     }
    }
   }
  </script>
 </head>
 <body>
  
 </body>
</html>

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