Jquery.Form 异步提交表单的简单实例

网络编程 2024/11/15 佚名

3 2 1

http://www.vaikan.com/docs/jquery.form.plugin/jquery.form.plugin.html#

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：
复制代码代码如下:
<form id="myForm" method="post" action="/Home/AjaxForm">
<div>
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" />
</div>
</form>

在没有Jquery.Form组件的时候，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="/UploadFiles/2021-04-02/jquery.js"><script type="text/javascript" src="/UploadFiles/2021-04-02/form.js"><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。
复制代码代码如下:
$(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：
复制代码代码如下:
[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
复制代码代码如下:
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。