DOM模型动态增加element

为列表框,下拉菜单增加选项
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>为列表框,下拉菜单增加选项</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  
  <body id="test">
    <script type="text/javascript">
    	//创建<select .../>对象
    	var a = document.createElement("select");
    	//为select对象增加元素
    	for(var i=0; i<10; i++){
    		var option = document.createElement("option");
    		option.innerHTML = '新增的选项' + i;
    		//将新的选项添加到列表框的最后
    		//a.add(option,null);   //或者
    		a.appendChild(option);
    	}
    	a.size = 5;
    	//将列表框增加成body元素的子节点
    	document.getElementById("test").appendChild(a);
    </script>
  </body>
</html>
 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>为列表框,下拉菜单增加选项</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	
  </head>
  
  <body id="test">
  	<input type="button" value="增加" disabled="disabled" id="add" onclick="add();" />
  	<input type="button" value="删除" id="delete" onclick="del();" />
  	<div id="target" style="width: 240px;height: 50px;border: 1px solid black;">
  		被控制的目标元素
  	</div> <br>
  	
  	<script type="text/javascript">
		var body = document.getElementById("test");
		var target = document.getElementById("target");
		function add(){
			body.appendChild(target);
			document.getElementById("add").disabled = "disabled";
			document.getElementById("delete").disabled = "";
		}
		function del(){
			body.removeChild(target);
			document.getElementById("delete").disabled = "disabled";
			document.getElementById("add").disabled = "";
		}
	</script>
  
    <script type="text/javascript">
    	//创建<select .../>对象
    	var a = document.createElement("select");
    	//为select对象增加元素
    	for(var i=0; i<10; i++){
    		var option = new Option('新增的选项'+i);
    		//直接为指定的选项赋值
    		a.options[i] = option;
    	}
    	a.size = 5;
    	//将列表框增加成body元素的子节点
    	document.getElementById("test").appendChild(a);
    </script>
  </body>
</html>
 

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