Jquery.Form 异步提交表单的简单实例

DeadRabbit0 2014-03-03

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:

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="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。

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