1. 程式人生 > >ajax的幾種便捷訪問伺服器的方式,簡單省心的ajax後臺訪問

ajax的幾種便捷訪問伺服器的方式,簡單省心的ajax後臺訪問

      今天來聊聊ajax的簡單訪問方式,當然你必須要匯入JQuery.js的包,

第一種 : $.post

這裡的ps可以是一個表單的序列,也就是表格裡面所有包含name的引數,都會在訪問時傳入後臺。

var ps = $("#submit_form").serialize(); 該操作即是將表單內容序列化為字串。

當然如果你不想使用ps,想使用另外一種方式也是可以的:將 ps 替換為 { "name" : "value1 ,  "name2" : value2} 。

 如同這種格式傳參也是OK的,當然,具體哪種看實際需求。

$.post("/URL", ps, function(data) {
    if (data){
        alert("You datas : " + data);
    }
    else {
        alert("失敗");
    }
});

方法等價於:

$.ajax({
            type : 'POST',
            url : "/URL",
            success : function(data) {
                if (data){
                    alert("You datas : " + data);
                }
                else {
                    alert("失敗");
                }
            }
});

第二種 $.getJSON 

方法特點: 相信大家看到名字就知道是幹嘛的了,沒錯就是訪問後臺然後拿到JSON字串的程式碼,

對比於僅僅指定ajax的$.ajax設定很多多餘的程式碼是不是簡單很多了呢?

$.getJSON("/URL",args,function(result, status) {
	console.log(result)
});

方法等價於:

$.ajax({
            type : 'POST',
            url : "/URL",
            dataType : 'json',
            success : function(result) {
                console.log(result)//列印返回值
            }
});

第三種 :$.getScript()

通過 HTTP GET 請求載入並執行 JavaScript 檔案。

語法: url :將要請求的 URL 字串。(路徑)

success : 可選。規定請求成功後執行的回撥函式。

額外的引數:

  • response - 包含來自請求的結果資料
  • status - 包含請求的狀態("success", "notmodified", "error", "timeout" 或 "parsererror")
jQuery.getScript(url,success(response,status))

 舉列程式碼:

$("button").click(function(){
  $.getScript("demo_ajax_script.js");
});

等價於:

$.ajax({
  url: url,
  dataType: "script",
  success: success
});

第四種:ajaxSubmit()提供了一種使用AJAX立即提交HTML表單的機制。這種方法挺棒的。

需要匯入輔助JS:為了不影響閱讀 ,該JS程式碼塊在文章最底層

$("#loginForm").ajaxSubmit(function(data) {
		if (data) {
			window.location.href = "/index.html";
		} else { 
			alert("登入失敗!");
		}
})

ajax一些其他的資訊:

以下資料來源於 : jQuery 參考手冊 - Ajax

jQuery Ajax 操作函式

jQuery 庫擁有完整的 Ajax 相容套件。其中的函式和方法允許我們在不重新整理瀏覽器的情況下從伺服器載入資料。

函式 描述
jQuery.ajax() 執行非同步 HTTP (Ajax) 請求。
.ajaxComplete() 當 Ajax 請求完成時註冊要呼叫的處理程式。這是一個 Ajax 事件。
.ajaxError() 當 Ajax 請求完成且出現錯誤時註冊要呼叫的處理程式。這是一個 Ajax 事件。
.ajaxSend() 在 Ajax 請求傳送之前顯示一條訊息。
jQuery.ajaxSetup() 設定將來的 Ajax 請求的預設值。
.ajaxStart() 當首個 Ajax 請求完成開始時註冊要呼叫的處理程式。這是一個 Ajax 事件。
.ajaxStop() 當所有 Ajax 請求完成時註冊要呼叫的處理程式。這是一個 Ajax 事件。
.ajaxSuccess() 當 Ajax 請求成功完成時顯示一條訊息。
jQuery.get() 使用 HTTP GET 請求從伺服器載入資料。
jQuery.getJSON() 使用 HTTP GET 請求從伺服器載入 JSON 編碼資料。
jQuery.getScript() 使用 HTTP GET 請求從伺服器載入 JavaScript 檔案,然後執行該檔案。
.load() 從伺服器載入資料,然後把返回到 HTML 放入匹配元素。
jQuery.param() 建立陣列或物件的序列化表示,適合在 URL 查詢字串或 Ajax 請求中使用。
jQuery.post() 使用 HTTP POST 請求從伺服器載入資料。
.serialize() 將表單內容序列化為字串。
.serializeArray() 序列化表單元素,返回 JSON 資料結構資料。

表單提交輔助JS:copy到 js裡然後 Ctrl + Shift + F 格式化一次就OK了。

PS: 如果你不知道怎麼建立JS檔案,可以查閱我之前的部落格。

連結:https://blog.csdn.net/qq_43227967/article/details/82832799 

/*!
 * jQuery Form Plugin
 * version: 3.51.0-2014.06.20
 * Requires jQuery v1.5 or later
 * Copyright (c) 2014 M. Alsup
 * Examples and documentation at: http://malsup.com/jquery/form/
 * Project repository: https://github.com/malsup/form
 * Dual licensed under the MIT and GPL licenses.
 * https://github.com/malsup/form#copyright-and-license
 */
/*global ActiveXObject */

// AMD support
(function(factory) {
	"use strict";
	if (typeof define === 'function' && define.amd) {
		// using AMD; register as anon module
		define([ 'jquery' ], factory);
	} else {
		// no AMD; invoke directly
		factory((typeof (jQuery) != 'undefined') ? jQuery : window.Zepto);
	}
}

		(function($) {
			"use strict";

			/*
			 * Usage Note: ----------- Do not use both ajaxSubmit and ajaxForm
			 * on the same form. These functions are mutually exclusive. Use
			 * ajaxSubmit if you want to bind your own submit handler to the
			 * form. For example,
			 * 
			 * $(document).ready(function() { $('#myForm').on('submit',
			 * function(e) { e.preventDefault(); // <-- important
			 * $(this).ajaxSubmit({ target: '#output' }); }); });
			 * 
			 * Use ajaxForm when you want the plugin to manage all the event
			 * binding for you. For example,
			 * 
			 * $(document).ready(function() { $('#myForm').ajaxForm({ target:
			 * '#output' }); });
			 * 
			 * You can also use ajaxForm with delegation (requires jQuery
			 * v1.7+), so the form does not have to exist when you invoke
			 * ajaxForm:
			 * 
			 * $('#myForm').ajaxForm({ delegation: true, target: '#output' });
			 * 
			 * When using ajaxForm, the ajaxSubmit function will be invoked for
			 * you at the appropriate time.
			 */

			/**
			 * Feature detection
			 */
			var feature = {};
			feature.fileapi = $("<input type='file'/>").get(0).files !== undefined;
			feature.formdata = window.FormData !== undefined;

			var hasProp = !!$.fn.prop;

			// attr2 uses prop when it can but checks the return type for
			// an expected string. this accounts for the case where a form
			// contains inputs with names like "action" or "method"; in those
			// cases "prop" returns the element
			$.fn.attr2 = function() {
				if (!hasProp) {
					return this.attr.apply(this, arguments);
				}
				var val = this.prop.apply(this, arguments);
				if ((val && val.jquery) || typeof val === 'string') {
					return val;
				}
				return this.attr.apply(this, arguments);
			};

			/**
			 * ajaxSubmit() provides a mechanism for immediately submitting an
			 * HTML form using AJAX.
			 */
			$.fn.ajaxSubmit = function(options) {
				/* jshint scripturl:true */

				// fast fail if nothing selected
				// (http://dev.jquery.com/ticket/2752)
				if (!this.length) {
					log('ajaxSubmit: skipping submit process - no element selected');
					return this;
				}

				var method, action, url, $form = this;

				if (typeof options == 'function') {
					options = {
						success : options
					};
				} else if (options === undefined) {
					options = {};
				}

				method = options.type || this.attr2('method');
				action = options.url || this.attr2('action');

				url = (typeof action === 'string') ? $.trim(action) : '';
				url = url || window.location.href || '';
				if (url) {
					// clean url (don't include hash vaue)
					url = (url.match(/^([^#]+)/) || [])[1];
				}

				options = $.extend(true,
						{
							url : url,
							success : $.ajaxSettings.success,
							type : method || $.ajaxSettings.type,
							iframeSrc : /^https/i.test(window.location.href
									|| '') ? 'javascript:false' : 'about:blank'
						}, options);

				// hook for manipulating the form data before it is extracted;
				// convenient for use with rich editors like tinyMCE or
				// FCKEditor
				var veto = {};
				this.trigger('form-pre-serialize', [ this, options, veto ]);
				if (veto.veto) {
					log('ajaxSubmit: submit vetoed via form-pre-serialize trigger');
					return this;
				}

				// provide opportunity to alter form data before it is
				// serialized
				if (options.beforeSerialize
						&& options.beforeSerialize(this, options) === false) {
					log('ajaxSubmit: submit aborted via beforeSerialize callback');
					return this;
				}

				var traditional = options.traditional;
				if (traditional === undefined) {
					traditional = $.ajaxSettings.traditional;
				}

				var elements = [];
				var qx, a = this.formToArray(options.semantic, elements);
				if (options.data) {
					options.extraData = options.data;
					qx = $.param(options.data, traditional);
				}

				// give pre-submit callback an opportunity to abort the submit
				if (options.beforeSubmit
						&& options.beforeSubmit(a, this, options) === false) {
					log('ajaxSubmit: submit aborted via beforeSubmit callback');
					return this;
				}

				// fire vetoable 'validate' event
				this
						.trigger('form-submit-validate', [ a, this, options,
								veto ]);
				if (veto.veto) {
					log('ajaxSubmit: submit vetoed via form-submit-validate trigger');
					return this;
				}

				var q = $.param(a, traditional);
				if (qx) {
					q = (q ? (q + '&' + qx) : qx);
				}
				if (options.type.toUpperCase() == 'GET') {
					options.url += (options.url.indexOf('?') >= 0 ? '&' : '?')
							+ q;
					options.data = null; // data is null for 'get'
				} else {
					options.data = q; // data is the query string for 'post'
				}

				var callbacks = [];
				if (options.resetForm) {
					callbacks.push(function() {
						$form.resetForm();
					});
				}
				if (options.clearForm) {
					callbacks.push(function() {
						$form.clearForm(options.includeHidden);
					});
				}

				// perform a load on the target only if dataType is not provided
				if (!options.dataType && options.target) {
					var oldSuccess = options.success || function() {
					};
					callbacks
							.push(function(data) {
								var fn = options.replaceTarget ? 'replaceWith'
										: 'html';
								$(options.target)[fn](data).each(oldSuccess,
										arguments);
							});
				} else if (options.success) {
					callbacks.push(options.success);
				}

				options.success = function(data, status, xhr) { // jQuery 1.4+
																// passes xhr as
																// 3rd arg
					var context = options.context || this; // jQuery 1.4+
															// supports scope
															// context
					for (var i = 0, max = callbacks.length; i < max; i++) {
						callbacks[i].apply(context, [ data, status,
								xhr || $form, $form ]);
					}
				};

				if (options.error) {
					var oldError = options.error;
					options.error = function(xhr, status, error) {
						var context = options.context || this;
						oldError.apply(context, [ xhr, status, error, $form ]);
					};
				}

				if (options.complete) {
					var oldComplete = options.complete;
					options.complete = function(xhr, status) {
						var context = options.context || this;
						oldComplete.apply(context, [ xhr, status, $form ]);
					};
				}

				// are there files to upload?

				// [value] (issue #113), also see comment:
				// https://github.com/malsup/form/commit/588306aedba1de01388032d5f42a60159eea9228#commitcomment-2180219
				var fileInputs = $('input[type=file]:enabled', this).filter(
						function() {
							return $(this).val() !== '';
						});

				var hasFileInputs = fileInputs.length > 0;
				var mp = 'multipart/form-data';
				var multipart = ($form.attr('enctype') == mp || $form
						.attr('encoding') == mp);

				var fileAPI = feature.fileapi && feature.formdata;
				log("fileAPI :" + fileAPI);
				var shouldUseFrame = (hasFileInputs || multipart) && !fileAPI;

				var jqxhr;

				// options.iframe allows user to force iframe mode
				// 06-NOV-09: now defaulting to iframe mode if file input is
				// detected
				if (options.iframe !== false
						&& (options.iframe || shouldUseFrame)) {
					// hack to fix Safari hang (thanks to Tim Molendijk for
					// this)
					// see:
					// http://groups.google.com/group/jquery-dev/browse_thread/thread/36395b7ab510dd5d
					if (options.closeKeepAlive) {
						$.get(options.closeKeepAlive, function() {
							jqxhr = fileUploadIframe(a);
						});
					} else {
						jqxhr = fileUploadIframe(a);
					}
				} else if ((hasFileInputs || multipart) && fileAPI) {
					jqxhr = fileUploadXhr(a);
				} else {
					jqxhr = $.ajax(options);
				}

				$form.removeData('jqxhr').data('jqxhr', jqxhr);

				// clear element array
				for (var k = 0; k < elements.length; k++) {
					elements[k] = null;
				}

				// fire 'notify' event
				this.trigger('form-submit-notify', [ this, options ]);
				return this;

				// utility fn for deep serialization
				function deepSerialize(extraData) {
					var serialized = $.param(extraData, options.traditional)
							.split('&');
					var len = serialized.length;
					var result = [];
					var i, part;
					for (i = 0; i < len; i++) {
						// #252; undo param space replacement
						serialized[i] = serialized[i].replace(/\+/g, ' ');
						part = serialized[i].split('=');
						// #278; use array instead of object storage, favoring
						// array serializations
						result.push([ decodeURIComponent(part[0]),
								decodeURIComponent(part[1]) ]);
					}
					return result;
				}

				// XMLHttpRequest Level 2 file uploads (big hat tip to
				// francois2metz)
				function fileUploadXhr(a) {
					var formdata = new FormData();

					for (var i = 0; i < a.length; i++) {
						formdata.append(a[i].name, a[i].value);
					}

					if (options.extraData) {
						var serializedData = deepSerialize(options.extraData);
						for (i = 0; i < serializedData.length; i++) {
							if (serializedData[i]) {
								formdata.append(serializedData[i][0],
										serializedData[i][1]);
							}
						}
					}

					options.data = null;

					var s = $.extend(true, {}, $.ajaxSettings, options, {
						contentType : false,
						processData : false,
						cache : false,
						type : method || 'POST'
					});

					if (options.uploadProgress) {
						// workaround because jqXHR does not expose upload
						// property
						s.xhr = function() {
							var xhr = $.ajaxSettings.xhr();
							if (xhr.upload) {
								xhr.upload.addEventListener('progress',
										function(event) {
											var percent = 0;
											var position = event.loaded
													|| event.position; /*
																		 * event.position
																		 * is
																		 * deprecated
																		 */
											var total = event.total;
											if (event.lengthComputable) {
												percent = Math.ceil(position
														/ total * 100);
											}
											options.uploadProgress(event,
													position, total, percent);
										}, false);
							}
							return xhr;
						};
					}

					s.data = null;
					var beforeSend = s.beforeSend;
					s.beforeSend = function(xhr, o) {
						// Send FormData() provided by user
						if (options.formData) {
							o.data = options.formData;
						} else {
							o.data = formdata;
						}
						if (beforeSend) {
							beforeSend.call(this, xhr, o);
						}
					};
					return $.ajax(s);
				}

				// private function for handling file uploads (hat tip to
				// YAHOO!)
				function fileUploadIframe(a) {
					var form = $form[0], el, i, s, g, id, $io, io, xhr, sub, n, timedOut, timeoutHandle;
					var deferred = $.Deferred();

					// #341
					deferred.abort = function(status) {
						xhr.abort(status);
					};

					if (a) {
						// ensure that every serialized input is still enabled
						for (i = 0; i < elements.length; i++) {
							el = $(elements[i]);
							if (hasProp) {
								el.prop('disabled', false);
							} else {
								el.removeAttr('disabled');
							}
						}
					}

					s = $.extend(true, {}, $.ajaxSettings, options);
					s.context = s.context || s;
					id = 'jqFormIO' + (new Date().getTime());
					if (s.iframeTarget) {
						$io = $(s.iframeTarget);
						n = $io.attr2('name');
						if (!n) {
							$io.attr2('name', id);
						} else {
							id = n;
						}
					} else {
						$io = $('<iframe name="' + id + '" src="' + s.iframeSrc
								+ '" />');
						$io.css({
							position : 'absolute',
							top : '-1000px',
							left : '-1000px'
						});
					}
					io = $io[0];

					xhr = { // mock object
						aborted : 0,
						responseText : null,
						responseXML : null,
						status : 0,
						statusText : 'n/a',
						getAllResponseHeaders : function() {
						},
						getResponseHeader : function() {
						},
						setRequestHeader : function() {
						},
						abort : function(status) {
							var e = (status === 'timeout' ? 'timeout'
									: 'aborted');
							log('aborting upload... ' + e);
							this.aborted = 1;

							try { // #214, #257
								if (io.contentWindow.document.execCommand) {
									io.contentWindow.document
											.execCommand('Stop');
								}
							} catch (ignore) {
							}

							$io.attr('src', s.iframeSrc); // abort op in
															// progress
							xhr.error = e;
							if (s.error) {
								s.error.call(s.context, xhr, e, status);
							}
							if (g) {
								$.event.trigger("ajaxError", [ xhr, s, e ]);
							}
							if (s.complete) {
								s.complete.call(s.context, xhr, e);
							}
						}
					};

					g = s.global;
					// trigger ajax global events so that activity/block
					// indicators work like normal
					if (g && 0 === $.active++) {
						$.event.trigger("ajaxStart");
					}
					if (g) {
						$.event.trigger("ajaxSend", [ xhr, s ]);
					}

					if (s.beforeSend
							&& s.beforeSend.call(s.context, xhr, s) === false) {
						if (s.global) {
							$.active--;
						}
						deferred.reject();
						return deferred;
					}
					if (xhr.aborted) {
						deferred.reject();
						return deferred;
					}

					// add submitting element to data if we know it
					sub = form.clk;
					if (sub) {
						n = sub.name;
						if (n && !sub.disabled) {
							s.extraData = s.extraData || {};
							s.extraData[n] = sub.value;
							if (sub.type == "image") {
								s.extraData[n + '.x'] = form.clk_x;
								s.extraData[n + '.y'] = form.clk_y;
							}
						}
					}

					var CLIENT_TIMEOUT_ABORT = 1;
					var SERVER_ABORT = 2;

					function getDoc(frame) {
						/*
						 * it looks like contentWindow or contentDocument do not
						 * carry the protocol property in ie8, when running
						 * under ssl frame.document is the only valid response
						 * document, since the protocol is know but not on the
						 * other two objects. strange? "Same origin policy"
						 * http://en.wikipedia.org/wiki/Same_origin_policy
						 */

						var doc = null;

						// IE8 cascading access check
						try {
							if (frame.contentWindow) {
								doc = frame.contentWindow.document;
							}
						} catch (err) {
							// IE8 access denied under ssl & missing protocol
							log('cannot get iframe.contentWindow document: '
									+ err);
						}

						if (doc) { // successful getting content
							return doc;
						}

						try { // simply checking may throw in ie8 under ssl or
								// mismatched protocol
							doc = frame.contentDocument ? frame.contentDocument
									: frame.document;
						} catch (err) {
							// last attempt
							log('cannot get iframe.contentDocument: ' + err);
							doc = frame.document;
						}
						return doc;
					}

					// Rails CSRF hack (thanks to Yvan Barthelemy)
					var csrf_token = $('meta[name=csrf-token]').attr('content');
					var csrf_param = $('meta[name=csrf-param]').attr('content');
					if (csrf_param && csrf_token) {
						s.extraData = s.extraData || {};
						s.extraData[csrf_param] = csrf_token;
					}

					// take a breath so that pending repaints get some cpu time
					// before the upload starts
					function doSubmit() {
						// make sure form attrs are set
						var t = $form.attr2('target'), a = $form
								.attr2('action'), mp = 'multipart/form-data', et = $form
								.attr('enctype')
								|| $form.attr('encoding') || mp;

						// update form attrs in IE friendly way
						form.setAttribute('target', id);
						if (!method || /post/i.test(method)) {
							form.setAttribute('method', 'POST');
						}
						if (a != s.url) {
							form.setAttribute('action', s.url);
						}

						// ie borks in some cases when setting encoding
						if (!s.skipEncodingOverride
								&& (!method || /post/i.test(method))) {
							$form.attr({
								encoding : 'multipart/form-data',
								enctype : 'multipart/form-data'
							});
						}

						// support timout
						if (s.timeout) {
							timeoutHandle = setTimeout(function() {
								timedOut = true;
								cb(CLIENT_TIMEOUT_ABORT);
							}, s.timeout);
						}

						// look for server aborts
						function checkState() {
							try {
								var state = getDoc(io).readyState;
								log('state = ' + state);
								if (state
										&& state.toLowerCase() == 'uninitialized') {
									setTimeout(checkState, 50);
								}
							} catch (e) {
								log('Server abort: ', e, ' (', e.name, ')');
								cb(SERVER_ABORT);
								if (timeoutHandle) {
									clearTimeout(timeoutHandle);
								}
								timeoutHandle = undefined;
							}
						}

						// add "extra" data to form if provided in options
						var extraInputs = [];
						try {
							if (s.extraData) {
								for ( var n in s.extraData) {
									if (s.extraData.hasOwnProperty(n)) {
										// if using the $.param format that
										// allows for multiple values with the
										// same name
										if ($.isPlainObject(s.extraData[n])
												&& s.extraData[n]
														.hasOwnProperty('name')
												&& s.extraData[n]
														.hasOwnProperty('value')) {
											extraInputs
													.push($(
															'<input type="hidden" name="'
																	+ s.extraData[n].name
																	+ '">')
															.val(
																	s.extraData[n].value)
															.appendTo(form)[0]);
										} else {
											extraInputs.push($(
													'<input type="hidden" name="'
															+ n + '">').val(
													s.extraData[n]).appendTo(
													form)[0]);
										}
									}
								}
							}

							if (!s.iframeTarget) {
								// add iframe to doc and submit the form
								$io.appendTo('body');
							}
							if (io.attachEvent) {
								io.attachEvent('onload', cb);
							} else {
								io.addEventListener('load', cb, false);
							}
							setTimeout(checkState, 15);

							try {
								form.submit();
							} catch (err) {
								// just in case form has element with name/id of
								// 'submit'
								var submitFn = document.createElement('form').submit;
								submitFn.apply(form);
							}
						} finally {
							// reset attrs and remove "extra" input elements
							form.setAttribute('action', a);
							form.setAttribute('enctype', et); // #380
							if (t) {
								form.setAttribute('target', t);
							} else {
								$form.removeAttr('target');
							}
							$(extraInputs).remove();
						}
					}

					if (s.forceSync) {
						doSubmit();
					} else {
						setTimeout(doSubmit, 10); // this lets dom updates
													// render
					}

					var data, doc, domCheckCount = 50, callbackProcessed;

					function cb(e) {
						if (xhr.aborted || callbackProcessed) {
							return;
						}

						doc = getDoc(io);
						if (!doc) {
							log('cannot access response document');
							e = SERVER_ABORT;
						}
						if (e === CLIENT_TIMEOUT_ABORT && xhr) {
							xhr.abort('timeout');
							deferred.reject(xhr, 'timeout');
							return;
						} else if (e == SERVER_ABORT && xhr) {
							xhr.abort('server abort');
							deferred.reject(xhr, 'error', 'server abort');
							return;
						}

						if (!doc || doc.location.href == s.iframeSrc) {
							// response not received yet
							if (!timedOut) {
								return;
							}
						}
						if (io.detachEvent) {
							io.detachEvent('onload', cb);
						} else {
							io.removeEventListener('load', cb, false);
						}

						var status = 'success', errMsg;
						try {
							if (timedOut) {
								throw 'timeout';
							}

							var isXml = s.dataType == 'xml' || doc.XMLDocument
									|| $.isXMLDoc(doc);
							log('isXml=' + isXml);
							if (!isXml
									&& window.opera
									&& (doc.body === null || !doc.body.innerHTML)) {
								if (--domCheckCount) {
									// in some browsers (Opera) the iframe DOM
									// is not always traversable when
									// the onload callback fires, so we loop a
									// bit to accommodate
									log('requeing onLoad callback, DOM not available');
									setTimeout(cb, 250);
									return;
								}
								// let this fall through because server response
								// could be an empty document
								// log('Could not access iframe DOM after
								// mutiple tries.');
								// throw 'DOMException: not available';
							}

							// log('response detected');
							var docRoot = doc.body ? doc.body
									: doc.documentElement;
							xhr.responseText = docRoot ? docRoot.innerHTML
									: null;
							xhr.responseXML = doc.XMLDocument ? doc.XMLDocument
									: doc;
							if (isXml) {
								s.dataType = 'xml';
							}
							xhr.getResponseHeader = function(header) {
								var headers = {
									'content-type' : s.dataType
								};
								return headers[header.toLowerCase()];
							};
							// support for XHR 'status' & 'statusText' emulation
							// :
							if (docRoot) {
								xhr.status = Number(docRoot
										.getAttribute('status'))
										|| xhr.status;
								xhr.statusText = docRoot
										.getAttribute('statusText')
										|| xhr.statusText;
							}

							var dt = (s.dataType || '').toLowerCase();
							var scr = /(json|script|text)/.test(dt);
							if (scr || s.textarea) {
								// see if user embedded response in textarea
								var ta = doc.getElementsByTagName('textarea')[0];
								if (ta) {
									xhr.responseText = ta.value;
									// support for XHR 'status' & 'statusText'
									// emulation :
									xhr.status = Number(ta
											.getAttribute('status'))
											|| xhr.status;
									xhr.statusText = ta
											.getAttribute('statusText')
											|| xhr.statusText;
								} else if (scr) {
									// account for browsers injecting pre around
									// json response
									var pre = doc.getElementsByTagName('pre')[0];
									var b = doc.getElementsByTagName('body')[0];
									if (pre) {
										xhr.responseText = pre.textContent ? pre.textContent
												: pre.innerText;
									} else if (b) {
										xhr.responseText = b.textContent ? b.textContent
												: b.innerText;
									}
								}
							} else if (dt == 'xml' && !xhr.responseXML
									&& xhr.responseText) {
								xhr.responseXML = toXml(xhr.responseText);
							}

							try {
								data = httpData(xhr, dt, s);
							} catch (err) {
								status = 'parsererror';
								xhr.error = errMsg = (err || status);
							}
						} catch (err) {
							log('error caught: ', err);
							status = 'error';
							xhr.error = errMsg = (err || status);
						}

						if (xhr.aborted) {
							log('upload aborted');
							status = null;
						}

						if (xhr.status) { // we've set xhr.status
							status = (xhr.status >= 200 && xhr.status < 300 || xhr.status === 304) ? 'success'
									: 'error';
						}

						// ordering of these callbacks/triggers is odd, but
						// that's how $.ajax does it
						if (status === 'success') {
							if (s.success) {
								s.success.call(s.context, data, 'success', xhr);
							}
							deferred.resolve(xhr.responseText, 'success', xhr);
							if (g) {
								$.event.trigger("ajaxSuccess", [ xhr, s ]);
							}
						} else if (status) {
							if (errMsg === undefined) {
								errMsg = xhr.statusText;
							}
							if (s.error) {
								s.error.call(s.context, xhr, status, errMsg);
							}
							deferred.reject(xhr, 'error', errMsg);
							if (g) {
								$.event
										.trigger("ajaxError",
												[ xhr, s, errMsg ]);
							}
						}

						if (g) {
							$.event.trigger("ajaxComplete", [ xhr, s ]);
						}

						if (g && !--$.active) {
							$.event.trigger("ajaxStop");
						}

						if (s.complete) {
							s.complete.call(s.context, xhr, status);
						}

						callbackProcessed = true;
						if (s.timeout) {
							clearTimeout(timeoutHandle);
						}

						// clean up
						setTimeout(function() {
							if (!s.iframeTarget) {
								$io.remove();
							} else { // adding else to clean up existing
										// iframe response.
								$io.attr('src', s.iframeSrc);
							}
							xhr.responseXML = null;
						}, 100);
					}

					var toXml = $.parseXML
							|| function(s, doc) { // use parseXML if available
													// (jQuery 1.5+)
								if (window.ActiveXObject) {
									doc = new ActiveXObject('Microsoft.XMLDOM');
									doc.async = 'false';
									doc.loadXML(s);
								} else {
									doc = (new DOMParser()).parseFromString(s,
											'text/xml');
								}
								return (doc && doc.documentElement && doc.documentElement.nodeName != 'parsererror') ? doc
										: null;
							};
					var parseJSON = $.parseJSON || function(s) {
						/* jslint evil:true */
						return window['eval']('(' + s + ')');
					};

					var httpData = function(xhr, type, s) { // mostly lifted
															// from jq1.4.4

						var ct = xhr.getResponseHeader('content-type') || '', xml = type === 'xml'
								|| !type && ct.indexOf('xml') >= 0, data = xml ? xhr.responseXML
								: xhr.responseText;

						if (xml
								&& data.documentElement.nodeName === 'parsererror') {
							if ($.error) {
								$.error('parsererror');
							}
						}
						if (s && s.dataFilter) {
							data = s.dataFilter(data, type);
						}
						if (typeof data === 'string') {
							if (type === 'json' || !type
									&& ct.indexOf('json') >= 0) {
								data = parseJSON(data);
							} else if (type === "script" || !type
									&& ct.indexOf("javascript") >= 0) {
								$.globalEval(data);
							}
						}
						return data;
					};

					return deferred;
				}
			};

			/**
			 * ajaxForm() provides a mechanism for fully automating form
			 * submission.
			 * 
			 * The advantages of using this method instead of ajaxSubmit() are:
			 * 
			 * 1: This method will include coordinates for <input type="image" />
			 * elements (if the element is used to submit the form). 2. This
			 * method will include the submit element's name/value data (for the
			 * element that was used to submit the form). 3. This method binds
			 * the submit() method to the form for you.
			 * 
			 * The options argument for ajaxForm works exactly as it does for
			 * ajaxSubmit. ajaxForm merely passes the options argument along
			 * after properly binding events for submit elements and the form
			 * itself.
			 */
			$.fn.ajaxForm = function(options) {
				options = options || {};
				options.delegation = options.delegation
						&& $.isFunction($.fn.on);

				// in jQuery 1.3+ we can fix mistakes with the ready state
				if (!options.delegation && this.length === 0) {
					var o = {
						s : this.selector,
						c : this.context
					};
					if (!$.isReady && o.s) {
						log('DOM not ready, queuing ajaxForm');
						$(function() {
							$(o.s, o.c).ajaxForm(options);
						});
						return this;
					}
					// is your DOM ready?
					// http://docs.jquery.com/Tutorials:Introducing_$(document).ready()
					log('terminating; zero elements found by selector'
							+ ($.isReady ? '' : ' (DOM not ready)'));
					return this;
				}

				if (options.delegation) {
					$(document).off('submit.form-plugin', this.selector,
							doAjaxSubmit).off('click.form-plugin',
							this.selector, captureSubmittingElement).on(
							'submit.form-plugin', this.selector, options,
							doAjaxSubmit).on('click.form-plugin',
							this.selector, options, captureSubmittingElement);
					return this;
				}

				return this.ajaxFormUnbind().bind('submit.form-plugin',
						options, doAjaxSubmit).bind('click.form-plugin',
						options, captureSubmittingElement);
			};

			// private event handlers
			function doAjaxSubmit(e) {
				/* jshint validthis:true */
				var options = e.data;
				if (!e.isDefaultPrevented()) { // if event has been canceled,
												// don't proceed
					e.preventDefault();
					$(e.target).ajaxSubmit(options); // #365
				}
			}

			function captureSubmittingElement(e) {
				/* jshint validthis:true */
				var target = e.target;
				var $el = $(target);
				if (!($el.is("[type=submit],[type=image]"))) {
					// is this a child element of the submit el? (ex: a span
					// within a button)
					var t = $el.closest('[type=submit]');
					if (t.length === 0) {
						return;
					}
					target = t[0];
				}
				var form = this;
				form.clk = target;
				if (target.type == 'image') {
					if (e.offsetX !== undefined) {
						form.clk_x = e.offsetX;
						form.clk_y = e.offsetY;
					} else if (typeof $.fn.offset == 'function') {
						var offset = $el.offset();
						form.clk_x = e.pageX - offset.left;
						form.clk_y = e.pageY - offset.top;
					} else {
						form.clk_x = e.pageX - target.offsetLeft;
						form.clk_y = e.pageY - target.offsetTop;
					}
				}
				// clear form vars
				setTimeout(function() {
					form.clk = form.clk_x = form.clk_y = null;
				}, 100);
			}

			// ajaxFormUnbind unbinds the event handlers that were bound by
			// ajaxForm
			$.fn.ajaxFormUnbind = function() {
				return this.unbind('submit.form-plugin click.form-plugin');
			};

			/**
			 * formToArray() gathers form element data into an array of objects
			 * that can be passed to any of the following ajax functions: $.get,
			 * $.post, or load. Each object in the array has both a 'name' and
			 * 'value' property. An example of an array for a simple login form
			 * might be:
			 *  [ { name: 'username', value: 'jresig' }, { name: 'password',
			 * value: 'secret' } ]
			 * 
			 * It is this array that is passed to pre-submit callback functions
			 * provided to the ajaxSubmit() and ajaxForm() methods.
			 */
			$.fn.formToArray = function(semantic, elements) {
				var a = [];
				if (this.length === 0) {
					return a;
				}

				var form = this[0];
				var formId = this.attr('id');
				var els = semantic ? form.getElementsByTagName('*')
						: form.elements;
				var els2;

				if (els && !/MSIE [678]/.test(navigator.userAgent)) { // #390
					els = $(els).get(); // convert to standard array
				}

				// #386; account for inputs outside the form which use the
				// 'form' attribute
				if (formId) {
					els2 = $(':input[form="' + formId + '"]').get(); // hat
																		// tip
																		// @thet
					if (els2.length) {
						els = (els || []).concat(els2);
					}
				}

				if (!els || !els.length) {
					return a;
				}

				var i, j, n, v, el, max, jmax;
				for (i = 0, max = els.length; i < max; i++) {
					el = els[i];
					n = el.name;
					if (!n || el.disabled) {
						continue;
					}

					if (semantic && form.clk && el.type == "image") {
						// handle image inputs on the fly when semantic == true
						if (form.clk == el) {
							a.push({
								name : n,
								value : $(el).val(),
								type : el.type
							});
							a.push({
								name : n + '.x',
								value : form.clk_x
							}, {
								name : n + '.y',
								value : form.clk_y
							});
						}
						continue;
					}

					v = $.fieldValue(el, true);
					if (v && v.constructor == Array) {
						if (elements) {
							elements.push(el);
						}
						for (j = 0, jmax = v.length; j < jmax; j++) {
							a.push({
								name : n,
								value : v[j]
							});
						}
					} else if (feature.fileapi && el.type == 'file') {
						if (elements) {
							elements.push(el);
						}
						var files = el.files;
						if (files.length) {
							for (j = 0; j < files.length; j++) {
								a.push({
									name : n,
									value : files[j],
									type : el.type
								});
							}
						} else {
							// #180
							a.push({
								name : n,
								value : '',
								type : el.type
							});
						}
					} else if (v !== null && typeof v != 'undefined') {
						if (elements) {
							elements.push(el);
						}
						a.push({
							name : n,
							value : v,
							type : el.type,
							required : el.required
						});
					}
				}

				if (!semantic && form.clk) {
					// input type=='image' are not found in elements array!
					// handle it here
					var $input = $(form.clk), input = $input[0];
					n = input.name;
					if (n && !input.disabled && input.type == 'image') {
						a.push({
							name : n,
							value : $input.val()
						});
						a.push({
							name : n + '.x',
							value : form.clk_x
						}, {
							name : n + '.y',
							value : form.clk_y
						});
					}
				}
				return a;
			};

			/**
			 * Serializes form data into a 'submittable' string. This method
			 * will return a string in the format: name1=value1&amp;name2=value2
			 */
			$.fn.formSerialize = function(semantic) {
				// hand off to jQuery.param for proper encoding
				return $.param(this.formToArray(semantic));
			};

			/**
			 * Serializes all field elements in the jQuery object into a query
			 * string. This method will return a string in the format:
			 * name1=value1&amp;name2=value2
			 */
			$.fn.fieldSerialize = function(successful) {
				var a = [];
				this.each(function() {
					var n = this.name;
					if (!n) {
						return;
					}
					var v = $.fieldValue(this, successful);
					if (v && v.constructor == Array) {
						for (var i = 0, max = v.length; i < max; i++) {
							a.push({
								name : n,
								value : v[i]
							});
						}
					} else if (v !== null && typeof v != 'undefined') {
						a.push({
							name : this.name,
							value : v
						});
					}
				});
				// hand off to jQuery.param for proper encoding
				return $.param(a);
			};

			/**
			 * Returns the value(s) of the element in the matched set. For
			 * example, consider the following form:
			 * 
			 * <form><fieldset> <input name="A" type="text" /> <input name="A"
			 * type="text" /> <input name="B" type="checkbox" value="B1" />
			 * <input name="B" type="checkbox" value="B2"/> <input name="C"
			 * type="radio" value="C1" /> <input name="C" type="radio"
			 * value="C2" /> </fieldset></form>
			 * 
			 * var v = $('input[type=text]').fieldValue(); // if no values are
			 * entered into the text inputs v == ['',''] // if values entered
			 * into the text inputs are 'foo' and 'bar' v == ['foo','bar']
			 * 
			 * var v = $('input[type=checkbox]').fieldValue(); // if neither
			 * checkbox is checked v === undefined // if both checkboxes are
			 * checked v == ['B1', 'B2']
			 * 
			 * var v = $('input[type=radio]').fieldValue(); // if neither radio
			 * is checked v === undefined // if first radio is checked v ==
			 * ['C1']
			 * 
			 * The successful argument controls whether or not the field element
			 * must be 'successful' (per
			 * http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
			 * The default value of the successful argument is true. If this
			 * value is false the value(s) for each element is returned.
			 * 
			 * Note: This method *always* returns an array. If no valid value
			 * can be determined the array will be empty, otherwise it will
			 * contain one or more values.
			 */
			$.fn.fieldValue = function(successful) {
				for (var val = [], i = 0, max = this.length; i < max; i++) {
					var el = this[i];
					var v = $.fieldValue(el, successful);
					if (v === null || typeof v == 'undefined'
							|| (v.constructor == Array && !v.length)) {
						continue;
					}
					if (v.constructor == Array) {
						$.merge(val, v);
					} else {
						val.push(v);
					}
				}
				return val;
			};

			/**
			 * Returns the value of the field element.
			 */
			$.fieldValue = function(el, successful) {
				var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
				if (successful === undefined) {
					successful = true;
				}

				if (successful
						&& (!n || el.disabled || t == 'reset' || t == 'button'
								|| (t == 'checkbox' || t == 'radio')
								&& !el.checked
								|| (t == 'submit' || t == 'image') && el.form
								&& el.form.clk != el || tag == 'select'
								&& el.selectedIndex == -1)) {
					return null;
				}

				if (tag == 'select') {
					var index = el.selectedIndex;
					if (index < 0) {
						return null;
					}
					var a = [], ops = el.options;
					var one = (t == 'select-one');
					var max = (one ? index + 1 : ops.length);
					for (var i = (one ? index : 0); i < max; i++) {
						var op = ops[i];
						if (op.selected) {
							var v = op.value;
							if (!v) { // extra pain for IE...
								v = (op.attributes && op.attributes.value && !(op.attributes.value.specified)) ? op.text
										: op.value;
							}
							if (one) {
								return v;
							}
							a.push(v);
						}
					}
					return a;
				}
				return $(el).val();
			};

			/**
			 * Clears the form data. Takes the following actions on the form's
			 * input fields: - input text fields will have their 'value'
			 * property set to the empty string - select elements will have
			 * their 'selectedIndex' property set to -1 - checkbox and radio
			 * inputs will have their 'checked' property set to false - inputs
			 * of type submit, button, reset, and hidden will *not* be effected -
			 * button elements will *not* be effected
			 */
			$.fn.clearForm = function(includeHidden) {
				return this
						.each(function() {
							$('input,select,textarea', this).clearFields(
									includeHidden);
						});
			};

			/**
			 * Clears the selected form elements.
			 */
			$.fn.clearFields = $.fn.clearInputs = function(includeHidden) {
				var re = /^(?:color|date|datetime|email|month|number|password|range|search|tel|text|time|url|week)$/i; // 'hidden'
																														// is
																														// not
																														// in
																														// this
																														// list
				return this.each(function() {
					var t = this.type, tag = this.tagName.toLowerCase();
					if (re.test(t) || tag == 'textarea') {
						this.value = '';
					} else if (t == 'checkbox' || t == 'radio') {
						this.checked = false;
					} else if (tag == 'select') {
						this.selectedIndex = -1;
					} else if (t == "file") {
						if (/MSIE/.test(navigator.userAgent)) {
							$(this).replaceWith($(this).clone(true));
						} else {
							$(this).val('');
						}
					} else if (includeHidden) {
						// includeHidden can be the value true, or it can be a
						// selector string
						// indicating a special test; for example:
						// $('#myForm').clearForm('.special:hidden')
						// the above would clean hidden inputs that have the
						// class of 'special'
						if ((includeHidden === true && /hidden/.test(t))
								|| (typeof includeHidden == 'string' && $(this)
										.is(includeHidden))) {
							this.value = '';
						}
					}
				});
			};

			/**
			 * Resets the form data. Causes all form elements to be reset to
			 * their original value.
			 */
			$.fn.resetForm = function() {
				return this
						.each(function() {
							// guard against an input with the name of 'reset'
							// note that IE reports the reset function as an
							// 'object'
							if (typeof this.reset == 'function'
									|| (typeof this.reset == 'object' && !this.reset.nodeType)) {
								this.reset();
							}
						});
			};

			/**
			 * Enables or disables any matching elements.
			 */
			$.fn.enable = function(b) {
				if (b === undefined) {
					b = true;
				}
				return this.each(function() {
					this.disabled = !b;
				});
			};

			/**
			 * Checks/unchecks any matching checkboxes or radio buttons and
			 * selects/deselects and matching option elements.
			 */
			$.fn.selected = function(select) {
				if (select === undefined) {
					select = true;
				}
				return this.each(function() {
					var t = this.type;
					if (t == 'checkbox' || t == 'radio') {
						this.checked = select;
					} else if (this.tagName.toLowerCase() == 'option') {
						var $sel = $(this).parent('select');
						if (select && $sel[0] && $sel[0].type == 'select-one') {
							// deselect all other options
							$sel.find('option').selected(false);
						}
						this.selected = select;
					}
				});
			};

			// expose debug var
			$.fn.ajaxSubmit.debug = false;

			// helper fn for console logging
			function log() {
				if (!$.fn.ajaxSubmit.debug) {
					return;
				}
				var msg = '[jquery.form] '
						+ Array.prototype.join.call(arguments, '');
				if (window.console && window.console.log) {
					window.console.log(msg);
				} else if (window.opera && window.opera.postError) {
					window.opera.postError(msg);
				}
			}

		}));