AjaxForm与AjaxSubmit的差异

JQuery中的AjaxForm和AjaxSubmit使用几乎相同功能也几乎相同。非常容易误解。

依照作者的解释：
AjaxForm
ajaxForm不能提交表单。在document的ready函数中，使用ajaxForm来为AJAX提交表单进行准备。提交动作必须由submit开始
ajaxSubmit
立即由AJAX来提交表单。你能够在不论什么情况下进行该项提交。
option的参数
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var options = {

   target:        '#output1',   // target element(s) to be updated with server response    
   beforeSubmit:  showRequest,  // pre-submit callback    
   success:       showResponse  // 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    

};
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演示样例代码摘自：http://www.malsup.com/jquery/form/#code-samples
ajaxForm
The following code controls the HTML form beneath it. It uses ajaxForm to bind the form and demonstrates how to use pre- and post-submit callbacks
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// prepare the form when the DOM is ready
$(document).ready(function() {

var options = { 
    target:        '#output1',   // target element(s) to be updated with server response 
    beforeSubmit:  showRequest,  // pre-submit callback 
    success:       showResponse  // 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 
}; 

// bind form using 'ajaxForm' 
$('#myForm1').ajaxForm(options); 

});

// pre-submit callback
function showRequest(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; 

}

// post-submit callback
function showResponse(responseText, statusText) {

// for normal html responses, the first argument to the success callback 
// is the XMLHttpRequest object's responseText property 

// if the ajaxForm method was passed an Options Object with the dataType 
// property set to 'xml' then the first argument to the success callback 
// is the XMLHttpRequest object's responseXML property 

// if the ajaxForm method was passed an Options Object with the dataType 
// property set to 'json' then the first argument to the success callback 
// is the json data object returned by the server 

alert('status: ' + statusText + '\n\nresponseText: \n' + responseText + 
    '\n\nThe output div should have already been updated with the responseText.'); 

}
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ajaxSubmit
The following code controls the HTML form beneath it. It uses ajaxSubmit to submit the form.

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// prepare the form when the DOM is ready
$(document).ready(function() {

var options = { 
    target:        '#output2',   // target element(s) to be updated with server response 
    beforeSubmit:  showRequest,  // pre-submit callback 
    success:       showResponse  // 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 
}; 

// bind to the form's submit event 
$('#myForm2').submit(function() { 
    // inside event callbacks 'this' is the DOM element so we first 
    // wrap it in a jQuery object and then invoke ajaxSubmit 
    $(this).ajaxSubmit(options); 

    // !!! Important !!! 
    // always return false to prevent standard browser submit and page navigation 
    return false; 
}); 

});

// pre-submit callback
function showRequest(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; 

}

// post-submit callback
function showResponse(responseText, statusText) {

// for normal html responses, the first argument to the success callback 
// is the XMLHttpRequest object's responseText property 

// if the ajaxSubmit method was passed an Options Object with the dataType 
// property set to 'xml' then the first argument to the success callback 
// is the XMLHttpRequest object's responseXML property 

// if the ajaxSubmit method was passed an Options Object with the dataType 
// property set to 'json' then the first argument to the success callback 
// is the json data object returned by the server 

alert('status: ' + statusText + '\n\nresponseText: \n' + responseText + 
    '\n\nThe output div should have already been updated with the responseText.'); 

}

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