js获取下拉列表的值和元素个数示例

软件编程
2026-01-11 17:08:59

js获取下拉列表框元素的个数

复制代码代码如下:
<!DOCTYPE html>
<html>
<head>
<script>
function getLength()
{
alert(document.getElementById("mySelect").length);//元素个数
}
</script>
</head>
<body>

<form>
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="getLength()" value="How many options in the list?">
</form>

</body>
</html>