Ajax 表单验证 实现代码

<noscript>
<div style="color:red">您的浏览器不支持javascript,部分功能无法使用</div>
</noscript>

<div id="js_support" style="display:none">
<p id="pSubmit"><input type="submit" name="registerform" value="注 册" onclick="return submitform();"/></p>
</div>
<script type="text/javascript">
$("js_support").style.display = "block";
</script>

function checkLogin(node) {
clearError();
if (bp.String.trim(node.value)!="") {
var url = "/test/response_validate";
var params = [];
params["mand"] = "logincheck";
params["login"] = encodeURI(bp.String.trim(node.value));
var v = validatePath("login",params["login"]);
if (v==""){
bp.Io.XhrGet({
url: url,
mimeType: "text/json",
params: params,
load: function(type, data, e) {
if (data==true){
loginError = document.getElementById("valstatus").innerHTML = '登录名已存在';
document.getElementById("loginValidate").className = "icon_cross";
node.className = "input_error";
loginValid = false;
} else {
loginError = "";
document.getElementById("loginValidate").className = "icon_ok";
node.className = "textbox";
loginValid = true;
}
},
error: function(type, data, e) {}
});
} else {
loginError = document.getElementById("valstatus").innerHTML = v;
document.getElementById("loginValidate").className = "icon_cross";
node.className = "input_error";
loginValid = false
}
} else {
loginError = validatePath("login", "");
document.getElementById("loginValidate").className = "";
node.className = "textbox";
}
}

def response_validate
if params[:login]
name = params[:login]
puts name
if name == "aaaaaa"
@value = true
render :partial => 'show_info'
else
@value = false
render :partial => 'show_info'
end
end
end