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How to implement drop-down control list in js

王林forward: 2020-05-18 09:20:362565browse

重要属性介绍：

ondblclick="selectOne()"：双击事件

select标签的属性：

multiple="multiple"：

看一下实现效果：

How to implement drop-down control list in js

具体实现代码：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<!--
			步骤分析
				1. 确定事件: 点击事件 :onclick事件
				2. 事件要触发函数 selectOne
				3. selectOne要做一些操作
					(将左边选中的元素移动到右边的select中)
					1. 获取左边Select中被选中的元素
					2. 将选中的元素添加到右边的Select中就可以
		-->
		<script>
			
			function selectOne(){
//				1. 获取左边Select中被选中的元素
				var leftSelect = document.getElementById("leftSelect");
				var options = leftSelect.options;
				
				//找到右侧的Select
				var rightSelect = document.getElementById("rightSelect");
				//遍历找出被选中的option
				for(var i=0; i < options.length; i++){
					var option1 = options[i];
					if(option1.selected){
		//				2. 将选中的元素添加到右边的Select中就可以
						rightSelect.appendChild(option1);
					}
				}
			}
			
			//将左边所有的商品移动到右边
			function selectAll(){
//				1. 获取左边Select中被选中的元素
				var leftSelect = document.getElementById("leftSelect");
				var options = leftSelect.options;
				
				//找到右侧的Select
				var rightSelect = document.getElementById("rightSelect");
				//遍历找出被选中的option
				for(var i=options.length - 1; i >=0; i--){
					var option1 = options[i];
					rightSelect.appendChild(option1);
				}
			}
			
			
			
		</script>
	</head>
	<body>
		
		<table border="1px" width="400px">
			<tr>
				<td>分类名称</td>
				<td><input type="text" value="手机数码"/></td>
			</tr>
			<tr>
				<td>分类描述</td>
				<td><input type="text" value="这里面都是手机数码"/></td>
			</tr>
			<tr>
				<td>分类商品</td>
				<td>
					<!--左边-->
					<div style="float: left;">
						已有商品<br />
						<select multiple="multiple" id="leftSelect" ondblclick="selectOne()">
							<option>华为</option>
							<option>小米</option>
							<option>锤子</option>
							<option>oppo</option>
						</select>
						<br />
						<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="selectOne()"> >> </a> <br />
						<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="selectAll()"> >>> </a>
					</div>
					<!--右边-->
					<div style="float: right;"> 
						未有商品<br />
						<select multiple="multiple" id="rightSelect">
							<option>苹果6</option>
							<option>肾7</option>
							<option>诺基亚</option>
							<option>波导</option>
						</select>
						<br />
						<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > << </a> <br />
						<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <<< </a>
					</div>
				</td>
			</tr>
			<tr>
				<td colspan="2">
					<input type="submit" value="提交"/>
				</td>
			</tr>
		</table>
	</body>
</html>

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