jquery.form 异步提交表单的简单实例。
1. 在你的页面里写一个表单。一个普通的表单,不需要任何特殊的标记:
. 代码如下:
<form id="myform" method="post" action="/home/ajaxform">
<p>
name:<input id="username" name="username" type="text" />
password:<input id="password" name="password" type="text" />
<br />
<input type="submit" value="submit async" id="lnksubmit" />
</p>
</form>
在没有jquery.form的时候,提交表单,页面会进入阻塞模式,等待服务器端的响应。
2. 引入jquery和form plugin javascript脚本文件并且添加几句简单的代码让页面在dom加载完成后初始化表单:
<head>
<script type="text/javascript" src="path/to/jquery.js"></script>
<script type="text/javascript" src="path/to/form.js"></script>
<script type="text/javascript">
// wait for the dom to be loaded
$(document).ready(function() {
// bind 'myform' and provide a simple callback function
// 为myform绑定ajaxform异步提交事件,并提供一个简单的回调函数。
$('#myform').ajaxform(function() {
alert("thank you for your comment!");
});
});
</script>
</head>
加上jquery.form组件后,提交表单时,页面不会再同步提交,而是由js做异步提交,因此提交后页面不会有刷新。
3. 加入能够与服务器端进行交互的回调函数。
. 代码如下:
$(document).ready(function () {
//options是一个ajaxform的配置对象。?
var options = {
//target: '#output1', // target element(s) to be updated with server response
//beforesubmit: showrequest, // pre-submit callback
<font color=#ff0000> success: callbackfunc // post-submit callback</font>
// other available options:
//url: url // override for form's 'action' attribute
//type: type // 'get' or 'post', override for form's 'method' attribute
//datatype: null // 'xml', 'script', or 'json' (expected server response type)
//clearform: true // clear all form fields after successful submit
//resetform: true // reset the form after successful submit
// $.ajax options can be used here too, for example:
//timeout: 3000
};
// bind form using 'ajaxform'
$('#myform').ajaxform(options);
});
// responsetext是服务端的响应值。statustext是页面
// 提交状态值,success表示成功。
function callbackfunc(responsetext, statustext) {
if (statustext == 'success') {
alert(responsetext);
}
else{
alert(“服务端错误!”);
}
}
如果返回的是json数据则回调函数可以这么写
function resultfunction(responsetext,statustext) {
if (statustext == 'success') {
if (responsetext.code == 1) {
alert(responsetext.message);
}
else {
alert('error occurs!');
}
}
else {
alert('服务器错误!');
}
}
服务端的代码如下:
. 代码如下:
[httppost]
public actionresult ajaxform(formcollection form)
{
string message = "name:" + form["username"] + " pwd: "+form["password"] ;
//return content(message);
return json(new { code = 1, message = message });
}
4. 加入提交前的数据校验函数
为options对象添加 beforesubmit属性
. 代码如下:
var options = {
//target: '#output1', // target element(s) to be updated with server response
<font color=#ff0000>beforesubmit: checkdata, // pre-submit callback
</font> success: callbackfunc // post-submit callback
// other available options:
//url: url // override for form's 'action' attribute
//type: type // 'get' or 'post', override for form's 'method' attribute
//datatype: null // 'xml', 'script', or 'json' (expected server response type)
//clearform: true // clear all form fields after successful submit
//resetform: true // reset the form after successful submit
// $.ajax options can be used here too, for example:
//timeout: 3000
};
// pre-submit callback
function checkdata(formdata, jqform, options) {
// formdata is an array; here we use $.param to convert it to a string to display it
// but the form plugin does this for you automatically when it submits the data
//var querystring = $.param(formdata);
// jqform is a jquery object encapsulating the form element. to access the
// dom element for the form do this:
var formelement = jqform[0];
//alert('about to submit: \n\n' + querystring);
// here we could return false to prevent the form from being submitted;
// returning anything other than false will allow the form submit to continue
//return true;
if ($(formelement).find("#username").val() == "") {
alert("please enter username!");
return false;
} else {
return true;
}
}
验证用户名是否为空,是则提示输入,并取消表单提交。