<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "[url]http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd[/url]">
<html xmlns="[url]http://www.w3.org/1999/xhtml[/url]">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>测试</title>
<script language="javascript" type="text/javascript">
function validate() {
for (var i = 0; i < document.getElementById("selectMenu").options.length; i++) {
if (document.getElementById("selectMenu").options[i].selected && (
document.getElementById("selectMenu").options[i].text == "不能删1" ||
document.getElementById("selectMenu").options[i].text == "不能删2")
) {
window.alert("不可删除！");
return false;
}
}
return true;
}
</script>
</head>
<body>
<form id="test" method="post" action="" onsubmit="return validate();">
<select id="selectMenu" name="selectMenu">
<option value="1">不能删1</option>
<option value="2">不能删2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<input type="submit" name="Submit" value="提交" />
</form>
</body>
</html>
注意其中“document.getElementById("selectMenu").options.text”还可以是：
document.getElementById("selectMenu").options.innerHTML
document.getElementById("selectMenu").options.value
这三项中，除了“document.getElementById("selectMenu").options.value”表示选项“value="4"”的值外，其它两项均表示网页上可见的选项值“4”。
