jquery dialog validate
以下代码，如果我试用把屏蔽的dialog去掉，alert为false。如果加上dialog的话，alert为true。
哪位大大能跟我说下，这是什么原因啊？
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>登录</title>
<link type="text/css" rel="stylesheet" href="css/smoothness/jquery-ui-1.10.3.custom.css" />
<script src="js/jquery-1.9.1.js" type="text/javascript"></script>
<script src="js/jquery-ui-1.10.3.custom.min.js" type="text/javascript"></script>
<script src="js/jquery.validate.js" type="text/javascript"></script>
<script src="js/login.js" type="text/javascript"></script>
<script type="text/javascript">
function flashImg(){
document.getElementById("VcodeImg").src="code.aspx?"+Math.random();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="login_div">
<div id="login_step" title="登陆">
<p>
<label for="Account" class="label">用户名</label>
<input type="text" id="txtAccount" name="txtAccount" class="login_txt" maxlength="20" />
</p>
<p>
<label for="pwd" class="label">密码</label>
<input type="password" id="txtPwd" name="txtPwd" class="login_txt" maxlength="20" />
</p>
<p>
<label for="cod" class="label">验证码</label>
<input type="text" id="txtCode" name="txtCode" class="login_txt" maxlength="4" style="width:50px;" />
<img src="code.aspx" class="vcode_img" id="VcodeImg" onclick="flashImg()" />
</p>
<p>
<input type="button" value="Login" onclick="login_submit()" />
</p>
</div>
</div>
</form>
</body>
</html>
jquery vaildate dailog
$(document).ready(function(){
$("#form1").validate({
rules: {
txtAccount: "required",
txtPwd:"required"
},
messages:{
txtAccount:"用户名不能为空",
txtPwd:"密码不能为空"
}
});
// $("#login_step").dialog({
// autoOpen:true,
// resizable:false,
// draggable:false,
// open: function(event, ui) { $(".ui-dialog-titlebar-close").hide(); }
// })
})
function login_submit(){
alert($("#form1").validate().form());
}
