Jquery.Form 异步提交表单的简单实例(2)

[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。

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