Jquery.Form 異步提交表單的簡單實例

2019-11-20 21:01:33

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

1. 在你的頁面里寫一個表單。一個普通的表單，不需要任何特殊的標記：

<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> 

在沒有Jquery.Form組件的時候，提交表單，頁面會進入阻塞模式，等待服務器端的響應。

2. 引入jQuery和Form Plugin Javascript腳本文件并且添加幾句簡單的代碼讓頁面在DOM加載完成后初始化表單：

<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
// 為myform綁定ajaxForm異步提交事件，并提供一個簡單的回調函數。
$('#myForm').ajaxForm(function() {
alert("Thank you for your comment!");
});
});
</script>
</head>
加上jquery.form組件后，提交表單時，頁面不會再同步提交，而是由js做異步提交，因此提交后頁面不會有刷新。

3. 加入能夠與服務器端進行交互的回調函數。

復制代碼代碼如下:

$(document).ready(function () {
     //options是一個ajaxForm的配置對象。?
     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是服務端的響應值。statusText是頁面

// 提交狀態值，success表示成功。
function callBackFunc(responseText, statusText) {
    if (statusText == 'success') {
        alert(responseText);
    }

else{

alert(“服務端錯誤！”);

}
}

如果返回的是json數據則回調函數可以這么寫
function resultFunction(responseText,statusText) {
        if (statusText == 'success') {
            if (responseText.code == 1) {
                alert(responseText.message);
            }
            else {
                alert('error occurs!');
            }
        }
        else {
            alert('服務器錯誤！');
        }
    }

服務端的代碼如下：

復制代碼代碼如下:

[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. 加入提交前的數據校驗函數
為options對象添加 beforeSubmit屬性

復制代碼代碼如下:

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; 
           } 
       } 