【jquery】阻止表单提交
<html>
<head>
<script src="../../scripts/jquery-1.3.1.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
$("#sub").bind("click",function(event){
var username = $("#username").val(); //获取元素的值
if(username==""){ //判断值是否为空
$("#msg").html("<p>文本框的值不能为空.</p>"); //提示信息
event.preventDefault(); //阻止默认行为 ( 表单提交 )或者return false;
}
})
})
</script>
</head>
<body>
<form action="test.html">
用户名：<input type="text" id="username" /> <br/>
<input type="submit" value="提交" id="sub"/>
</form>
<div id="msg"></div>
</body>
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