JQuery-Form中的AjaxForm和AjaxSubmit的区别和中文乱码

JQuery中的AjaxForm和AjaxSubmit使用差不多功能也差不多。很容易误解。

按照作者的解释：

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

马上由AJAX来提交表单。你可以在任何情况下进行该项提交。

option的参数

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
};
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
// 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.');
}
ajaxSubmit

The following code controls the HTML form beneath it. It uses ajaxSubmit to submit the form.
// 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.');
}
改变中文乱码方案

form.js增加如下代码

$.fn.param=function( a ) {
var encode=function(v){//如果包含中文就escape,避免重复escape)
return /[^\x00-\xff]/g.test(v)?escape(v):v;
}
var s = [];
if ( a.constructor == Array || a.jquery )
jQuery.each( a, function(){
s.push( encode(this.name) + "=" + encode( this.value ) );
});
else
for ( var j in a )
if ( a[j] && a[j].constructor == Array )
jQuery.each( a[j], function(){
s.push( encode(j) + "=" + encode( this ) );
});
else
s.push( encode(j) + "=" + encode( a[j] ) );
return s.join("&").replace(/%20/g, "+");
}

之后把所有调用$.param的地方改成 this.param,

$(document).ready(function() {
var options = {
beforeSubmit:showRequest,
//success:showResponse
};
$('#regForm').ajaxForm(options);
});
function showRequest(formData, jqForm, options) {
var queryString = this.param(formData);
return true;
}

JQuery ajaxSubmit提交中文乱码的解决方案

一般人使用是

jQuery(form).ajaxSubmit({
url: "ajaxsub.aspx?abc=test",

type: "post",
dataType: "json",
success: data
});

分析：JQuery的AJAX提交，会将要提交的数据进行编码，使用encodeURIComponent在js中处理数据。因此，无论是 Firefox或者IE，提交的数据都是一致的，都是UTF-8编码后的数据。

查看Header，发现Entity中的Content-Type存在差异

在Firefox中，Content-Type指定了字符集为utf-8。

而IE里面却没有任何字符集指定，

显然，默认情况下，AJAX的异步提交的字符编码应该和网页本身保持一致，也就是说，Server端在没有发现显示的charset指定的情
况下，使用gb2312来解码数据（但是数据在提交前已经被UTF-8编码了），这就是为什么在IE下会出现乱码的根源，而在Firefox下，浏览器在
提交AJAX数据的时候，加上了charset的显示指定，导致Server端采用UTF-8来解码数据（正确解码）。

查阅JQuery的AJAX工具函数的说明，发现options中有一个指定content-type的参数

所以在提交的时候要指定编码类型

contentType: "application/x-www-form-urlencoded; charset=utf-8",

即如下

jQuery(form).ajaxSubmit({
url: "ajaxsub.aspx?abc=test",
type: "post",
dataType: "json",
contentType: "application/x-www-form-urlencoded; charset=utf-8",
success: data
});