AjaxUpLoad.js使用实现文件上传

AjaxUpLoad.js的使用实现无刷新文件上传，如图。

图1 文件上传前

图2 文件上传后

1、创建页面并编写HTML

上传文档:<div class="uploadFile"><span id="doc"><input type="text" disabled="disabled" /></span><input type="hidden" id="hidFileName" /><input type="button" id="btnUploadFile" value="上传" /><input type="button" id="btnDeleteFile" value="删除" /></div>上传图片:<div class="uploadImg"><img id="imgShow" src="/images/nophoto.gif" /><input type="hidden" id="hidImgName" /><input type="button" id="btnUploadImg" value="上传" /><input type="button" id="btnDeleteImg" value="删除" /></div>

2、引用AjaxUpload.js文件

<script src="/js/common/AjaxUpload.js" type="text/javascript"></script>

3、编写JS脚本

4、创建/Common/UploadHandler.ashx处理程序

<%@ WebHandler Language="C#" Class="UploadHandler" %>using System;using System.Web;using System.Text.RegularExpressions;using System.IO;public class UploadHandler : IHttpHandler {private string _filedir = ""; //文件目录/// <summary>/// 处理上传文件(1:文件格式不正确、2:文件大小不正确、3:上传失败、文件名称:上传成功)/// </summary>/// <param name="context"></param>public void ProcessRequest (HttpContext context) {_filedir = context.Server.MapPath(@"/file/temp/");try{string result = "3";string fileType = context.Request.QueryString["fileType"]; //获取上传文件类型if (fileType == "file"){result = UploadFile(context); //文档上传}else if (fileType == "img"){result = UploadImg(context); //图片上传}context.Response.Write(result);}catch{context.Response.Write("3");//3文件上传失败}}/// <summary>/// 文档上传/// </summary>/// <param name="context"></param>/// <returns></returns>private string UploadFile(HttpContext context){int cout = context.Request.Files.Count;if (cout > 0){HttpPostedFile hpf = context.Request.Files[0];if (hpf != null){string fileExt = Path.GetExtension(hpf.FileName).ToLower();//只能上传文件，过滤不可上传的文件类型 string fileFilt = ".rar|.zip|.pdf|.pdfx|.txt|.csv|.xls|.xlsx|.doc|.docx......";if (fileFilt.IndexOf(fileExt) <= -1){return "1";}//判断文件大小 int length = hpf.ContentLength;if (length > 2097152){return "2";} Random rd = new Random();DateTime nowTime = DateTime.Now;string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);if (!Directory.Exists(_filedir)){Directory.CreateDirectory(_filedir);}string fileName = _filedir + newFileName;hpf.SaveAs(fileName);return newFileName;}}return "3";}/// <summary>/// 图片上传/// </summary>/// <param name="context"></param>/// <returns></returns>private string UploadImg(HttpContext context){int cout = context.Request.Files.Count;if (cout > 0){HttpPostedFile hpf = context.Request.Files[0];if (hpf != null){string fileExt = Path.GetExtension(hpf.FileName).ToLower();//只能上传文件，过滤不可上传的文件类型 string fileFilt = ".gif|.jpg|.php|.jsp|.jpeg|.png|......";if (fileFilt.IndexOf(fileExt) <= -1){return "1";}//判断文件大小 int length = hpf.ContentLength;if (length > 204800){return "2";}Random rd = new Random();DateTime nowTime = DateTime.Now;string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);if (!Directory.Exists(_filedir)){Directory.CreateDirectory(_filedir);}string fileName = _filedir + newFileName;hpf.SaveAs(fileName);return newFileName;}}return "3";}#region IHttpHandler 成员public bool IsReusable{get { throw new NotImplementedException(); }}#endregion}

附件1：页面CSS样式

/*上传文件*/.uploadFile{margin-bottom:10px;}/*上传图片*/.uploadImg{}.uploadImg img{width:102px; height:64px; border:1px solid #CCCCCC; display: block;}

附件2：AjaxUpload.js文件

/*** AJAX Upload ( /ajax-upload/ ) * Copyright (c) Andris Valums* Licensed under the MIT license ( /mit-license/ )* Thanks to Gary Haran, David Mark, Corey Burns and others for contributions */(function () {/* global window *//* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true *//*** Wrapper for FireBug's console.log*/function log() {if (typeof(console) != 'undefined' && typeof(console.log) == 'function') {Array.prototype.unshift.call(arguments, '[Ajax Upload]');console.log(Array.prototype.join.call(arguments, ' '));}}/*** Attaches event to a dom element.* @param {Element} el* @param type event name* @param fn callback This refers to the passed element*/function addEvent(el, type, fn) {if (el.addEventListener) {el.addEventListener(type, fn, false);} else if (el.attachEvent) {el.attachEvent('on' + type, function () {fn.call(el);});} else {throw new Error('not supported or DOM not loaded');}}/*** Attaches resize event to a window, limiting* number of event fired. Fires only when encounteres* delay of 100 after series of events.* * Some browsers fire event multiple times when resizing* /dom/events/resize.html* * @param fn callback This refers to the passed element*/function addResizeEvent(fn) {var timeout;addEvent(window, 'resize', function () {if (timeout) {clearTimeout(timeout);}timeout = setTimeout(fn, 100);});}// Needs more testing, will be rewriten for next version // getOffset function copied from jQuery lib (/)if (document.documentElement.getBoundingClientRect) {// Get Offset using getBoundingClientRect// /blog/getboundingclientrect-is-awesome/var getOffset = function (el) {var box = el.getBoundingClientRect();var doc = el.ownerDocument;var body = doc.body;var docElem = doc.documentElement; // for ie var clientTop = docElem.clientTop || body.clientTop || 0;var clientLeft = docElem.clientLeft || body.clientLeft || 0;// In Internet Explorer 7 getBoundingClientRect property is treated as physical,// while others are logical. Make all logical, like in IE8.var zoom = 1;if (body.getBoundingClientRect) {var bound = body.getBoundingClientRect();zoom = (bound.right - bound.left) / body.clientWidth;}if (zoom > 1) {clientTop = 0;clientLeft = 0;}var top = box.top / zoom + (window.pageYOffset || docElem && docElem.scrollTop / zoom || body.scrollTop / zoom) - clientTop,left = box.left / zoom + (window.pageXOffset || docElem && docElem.scrollLeft / zoom || body.scrollLeft / zoom) - clientLeft;return {top: top,left: left};};} else {// Get offset adding all offsets var getOffset = function (el) {var top = 0,left = 0;do {top += el.offsetTop || 0;left += el.offsetLeft || 0;el = el.offsetParent;} while (el);return {left: left,top: top};};}/*** Returns left, top, right and bottom properties describing the border-box,* in pixels, with the top-left relative to the body* @param {Element} el* @return {Object} Contains left, top, right,bottom*/function getBox(el) {var left, right, top, bottom;var offset = getOffset(el);left = offset.left;top = offset.top;right = left + el.offsetWidth;bottom = top + el.offsetHeight;return {left: left,right: right,top: top,bottom: bottom};}/*** Helper that takes object literal* and add all properties to element.style* @param {Element} el* @param {Object} styles*/function addStyles(el, styles) {for (var name in styles) {if (styles.hasOwnProperty(name)) {el.style[name] = styles[name];}}}/*** Function places an absolutely positioned* element on top of the specified element* copying position and dimentions.* @param {Element} from* @param {Element} to*/function copyLayout(from, to) {var box = getBox(from);addStyles(to, {position: 'absolute',left: box.left + 'px',top: box.top + 'px',width: from.offsetWidth + 'px',height: from.offsetHeight + 'px'});}/*** Creates and returns element from html chunk* Uses innerHTML to create an element*/var toElement = (function () {var div = document.createElement('div');return function (html) {div.innerHTML = html;var el = div.firstChild;return div.removeChild(el);};})();/*** Function generates unique id* @return unique id */var getUID = (function () {var id = 0;return function () {return 'ValumsAjaxUpload' + id++;};})();/*** Get file name from path* @param {String} file path to file* @return filename*/function fileFromPath(file) {return file.replace(/.*(\/|\\)/, "");}/*** Get file extension lowercase* @param {String} file name* @return file extenstion*/function getExt(file) {return (-1 !== file.indexOf('.')) ? file.replace(/.*[.]/, '') : '';}function hasClass(el, name) {var re = new RegExp('\\b' + name + '\\b');return re.test(el.className);}function addClass(el, name) {if (!hasClass(el, name)) {el.className += ' ' + name;}}function removeClass(el, name) {var re = new RegExp('\\b' + name + '\\b');el.className = el.className.replace(re, '');}function removeNode(el) {el.parentNode.removeChild(el);}/*** Easy styling and uploading* @constructor* @param button An element you want convert to * upload button. Tested dimentions up to 500x500px* @param {Object} options See defaults below.*/window.AjaxUpload = function (button, options) {this._settings = {// Location of the server-side upload scriptaction: 'upload.php',// File upload namename: 'userfile',// Additional data to senddata: {},// Submit file as soon as it's selectedautoSubmit: true,// The type of data that you're expecting back from the server.// html and xml are detected automatically.// Only useful when you are using json data as a response.// Set to "json" in that case. responseType: false,// Class applied to button when mouse is hoveredhoverClass: 'hover',// Class applied to button when AU is disableddisabledClass: 'disabled',// When user selects a file, useful with autoSubmit disabled// You can return false to cancel uploadonChange: function (file, extension) {},// Callback to fire before file is uploaded// You can return false to cancel uploadonSubmit: function (file, extension) {},// Fired when file upload is completed// WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!onComplete: function (file, response) {}};// Merge the users options with our defaultsfor (var i in options) {if (options.hasOwnProperty(i)) {this._settings[i] = options[i];}}// button isn't necessary a dom elementif (button.jquery) {// jQuery object was passedbutton = button[0];} else if (typeof button == "string") {if (/^#.*/.test(button)) {// If jQuery user passes #elementId don't break itbutton = button.slice(1);}button = document.getElementById(button);}if (!button || button.nodeType !== 1) {throw new Error("Please make sure that you're passing a valid element");}if (button.nodeName.toUpperCase() == 'A') {// disable link addEvent(button, 'click', function (e) {if (e && e.preventDefault) {e.preventDefault();} else if (window.event) {window.event.returnValue = false;}});}// DOM elementthis._button = button;// DOM element this._input = null;// If disabled clicking on button won't do anythingthis._disabled = false;// if the button was disabled before refresh if will remain// disabled in FireFox, let's fix itthis.enable();this._rerouteClicks();};// assigning methods to our classAjaxUpload.prototype = {setData: function (data) {this._settings.data = data;},disable: function () {addClass(this._button, this._settings.disabledClass);this._disabled = true;var nodeName = this._button.nodeName.toUpperCase();if (nodeName == 'INPUT' || nodeName == 'BUTTON') {this._button.setAttribute('disabled', 'disabled');}// hide inputif (this._input) {// We use visibility instead of display to fix problem with Safari 4// The problem is that the value of input doesn't change if it // has display none when user selects a file this._input.parentNode.style.visibility = 'hidden';}},enable: function () {removeClass(this._button, this._settings.disabledClass);this._button.removeAttribute('disabled');this._disabled = false;},/*** Creates invisible file input * that will hover above the button* <div><input type='file' /></div>*/_createInput: function () {var self = this;var input = document.createElement("input");input.setAttribute('type', 'file');input.setAttribute('name', this._settings.name);addStyles(input, {'position': 'absolute',// in Opera only 'browse' button// is clickable and it is located at// the right side of the input'right': 0,'margin': 0,'padding': 0,'fontSize': '480px','cursor': 'pointer'});var div = document.createElement("div");addStyles(div, {'display': 'block','position': 'absolute','overflow': 'hidden','margin': 0,'padding': 0,'opacity': 0,// Make sure browse button is in the right side// in Internet Explorer'direction': 'ltr',//Max zIndex supported by Opera 9.0-9.2'zIndex': 2147483583});// Make sure that element opacity exists.// Otherwise use IE filter if (div.style.opacity !== "0") {if (typeof(div.filters) == 'undefined') {throw new Error('Opacity not supported by the browser');}div.style.filter = "alpha(opacity=0)";}addEvent(input, 'change', function () {if (!input || input.value === '') {return;}// Get filename from input, required// as some browsers have path instead of itvar file = fileFromPath(input.value);if (false === self._settings.onChange.call(self, file, getExt(file))) {self._clearInput();return;}// Submit form when value is changedif (self._settings.autoSubmit) {self.submit();}});addEvent(input, 'mouseover', function () {addClass(self._button, self._settings.hoverClass);});addEvent(input, 'mouseout', function () {removeClass(self._button, self._settings.hoverClass);// We use visibility instead of display to fix problem with Safari 4// The problem is that the value of input doesn't change if it // has display none when user selects a file input.parentNode.style.visibility = 'hidden';});div.appendChild(input);document.body.appendChild(div);this._input = input;},_clearInput: function () {if (!this._input) {return;}// this._input.value = ''; Doesn't work in IE6 removeNode(this._input.parentNode);this._input = null;this._createInput();removeClass(this._button, this._settings.hoverClass);},/*** Function makes sure that when user clicks upload button,* the this._input is clicked instead*/_rerouteClicks: function () {var self = this;// IE will later display 'access denied' error// if you use using self._input.click()// other browsers just ignore click()addEvent(self._button, 'mouseover', function () {if (self._disabled) {return;}if (!self._input) {self._createInput();}var div = self._input.parentNode;copyLayout(self._button, div);div.style.visibility = 'visible';});// commented because we now hide input on mouseleave/*** When the window is resized the elements * can be misaligned if button position depends* on window size*///addResizeEvent(function(){// if (self._input){// copyLayout(self._button, self._input.parentNode);// }//}); },/*** Creates iframe with unique name* @return {Element} iframe*/_createIframe: function () {// We can't use getTime, because it sometimes return// same value in safari :(var id = getUID();// We can't use following code as the name attribute// won't be properly registered in IE6, and new window// on form submit will open// var iframe = document.createElement('iframe');// iframe.setAttribute('name', id); var iframe = toElement('<iframe src="javascript:false;" name="' + id + '" />');// src="javascript:false; was added// because it possibly removes ie6 prompt // "This page contains both secure and nonsecure items"// Anyway, it doesn't do any harm. iframe.setAttribute('id', id);iframe.style.display = 'none';document.body.appendChild(iframe);return iframe;},/*** Creates form, that will be submitted to iframe* @param {Element} iframe Where to submit* @return {Element} form*/_createForm: function (iframe) {var settings = this._settings;// We can't use the following code in IE6// var form = document.createElement('form');// form.setAttribute('method', 'post');// form.setAttribute('enctype', 'multipart/form-data');// Because in this case file won't be attached to requestvar form = toElement('<form method="post" enctype="multipart/form-data"></form>');form.setAttribute('action', settings.action);form.setAttribute('target', iframe.name);form.style.display = 'none';document.body.appendChild(form);// Create hidden input element for each data keyfor (var prop in settings.data) {if (settings.data.hasOwnProperty(prop)) {var el = document.createElement("input");el.setAttribute('type', 'hidden');el.setAttribute('name', prop);el.setAttribute('value', settings.data[prop]);form.appendChild(el);}}return form;},/*** Gets response from iframe and fires onComplete event when ready* @param iframe* @param file Filename to use in onComplete callback */_getResponse: function (iframe, file) {// getting responsevar toDeleteFlag = false,self = this,settings = this._settings;addEvent(iframe, 'load', function () {if ( // For Safari iframe.src == "javascript:'%3Chtml%3E%3C/html%3E';" ||// For FF, IEiframe.src == "javascript:'<html></html>';") {// First time around, do not delete.// We reload to blank page, so that reloading main page// does not re-submit the post.if (toDeleteFlag) {// Fix busy state in FF3setTimeout(function () {removeNode(iframe);},0);}return;}var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document;// fixing Opera 9.26,10.00if (doc.readyState && doc.readyState != 'complete') {// Opera fires load event multiple times// Even when the DOM is not ready yet// this fix should not affect other browsersreturn;}// fixing Opera 9.64if (doc.body && doc.body.innerHTML == "false") {// In Opera 9.64 event was fired second time// when body.innerHTML changed from false // to server response approx. after 1 secreturn;}var response;if (doc.XMLDocument) {// response is a xml document Internet Explorer propertyresponse = doc.XMLDocument;} else if (doc.body) {// response is html document or plain textresponse = doc.body.innerHTML;if (settings.responseType && settings.responseType.toLowerCase() == 'json') {// If the document was sent as 'application/javascript' or// 'text/javascript', then the browser wraps the text in a <pre>// tag and performs html encoding on the contents. In this case,// we need to pull the original text content from the text node's// nodeValue property to retrieve the unmangled content.// Note that IE6 only understands text/htmlif (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == 'PRE') {response = doc.body.firstChild.firstChild.nodeValue;}if (response) {response = eval("(" + response + ")");} else {response = {};}}} else {// response is a xml documentresponse = doc;}settings.onComplete.call(self, file, response);// Reload blank page, so that reloading main page// does not re-submit the post. Also, remember to// delete the frametoDeleteFlag = true;// Fix IE mixed content issueiframe.src = "javascript:'<html></html>';";});},/*** Upload file contained in this._input*/submit: function () {var self = this,settings = this._settings;if (!this._input || this._input.value === '') {return;}var file = fileFromPath(this._input.value);// user returned false to cancel uploadif (false === settings.onSubmit.call(this, file, getExt(file))) {this._clearInput();return;}// sending request var iframe = this._createIframe();var form = this._createForm(iframe);// assuming following structure// div -> input type='file'removeNode(this._input.parentNode);removeClass(self._button, self._settings.hoverClass);form.appendChild(this._input);form.submit();// request set, clean upremoveNode(form);form = null;removeNode(this._input);this._input = null;// Get response from iframe and fire onComplete event when readythis._getResponse(iframe, file);// get ready for next request this._createInput();}};})();