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0 ajaxFileUpload简介 

ajaxFileUpload插件是一个非常简单的基于Jquery的异步上传文件的插件,使用过程中发现很多与这个同名的,基于原始版本基础之上修改过的插件,文件版本比较多,我把我自己使用的ajaxFileUpload文件上传到博客园上了,想要使用的朋友可以下载:http://files.cnblogs.com/files/fonour/ajaxfileupload.js。 

整个插件源码不到200行,实现非常简单,大致原理就是通过js动态创建隐藏的表单,然后进行提交操作,达到附件上传的目的,主要实现在源码里都有注释,不难理解,我们也可以基于此简单版本实现更复杂的操作。 

1 ajaxFileUpload使用说明 

ajaxFileUpload的使用也很简单,调用ajaxFileUpload方法即可,各配置项详细说明如下: 
$.ajaxFileUpload({ type: "post", //请求类型:post或get,当要使用data提交自定义参数时一定要设置为post url: "/Shared/Upload", //文件上传的服务器端请求地址secureuri: false, //是否启用安全提交,一般默认为false就行,不用特殊处理fileElementId: "filePicture", //文件上传控件的id<input type="file" id="filePicture" name="filePicture" accept=".jpg,.jpeg,.png,.bmp" onchange="filePictureChange()" /> dataType: "json", //返回值类型,一般设置为json,还支持htmlxmlscript类型data: { "id": "1", "name": "test" },//用于post请求提交自定义参数success: function (data, status) { //服务器成功响应处理函数},error: function (data, status, e) {//服务器响应失败处理函数}});
首先在页面添加对JQuery及ajaxFileUpload的引用,这里的JQuery用的2.1.4版本,经测试用各个版本基本没什么影响。
 <script src="../../Content/js/jquery-2.1.4.min.js"></script>
<script src="../../Content/js/ajaxfileupload.js"></script>
页面添加类型为file的input标签
 复制代码 代码如下:<input type="file" id="filePicture" name="filePicture" accept=".jpg,.jpeg,.png,.bmp" onchange="filePictureChange()" />
通过accept可以限定打开文件选择对话框后,默认能选择的文件类型。文件类型的定义主要有以下这些 
*.3gpp  audio/3gpp, video/3gpp  3GPP Audio/Video
*.ac3   audio/ac3   AC3 Audio
*.asf   allpication/vnd.ms-asf  Advanced Streaming Format
*.au    audio/basic AU Audio
*.css   text/css    Cascading Style Sheets
*.csv   text/csv    Comma Separated Values
*.doc   application/msword  MS Word Document
*.dot   application/msword  MS Word Template
*.dtd   application/xml-dtd Document Type Definition
*.dwg   image/vnd.dwg   AutoCAD Drawing Database
*.dxf   image/vnd.dxf   AutoCAD Drawing Interchange Format
*.gif   image/gif   Graphic Interchange Format
*.htm   text/html   HyperText Markup Language
*.html  text/html   HyperText Markup Language
*.jp2   image/jp2   JPEG-2000
*.jpe   image/jpeg  JPEG
*.jpeg  image/jpeg  JPEG
*.jpg   image/jpeg  JPEG
*.js    text/javascript, application/javascript JavaScript
*.json  application/json    JavaScript Object Notation
*.mp2   audio/mpeg, video/mpeg  MPEG Audio/Video Stream, Layer II
*.mp3   audio/mpeg  MPEG Audio Stream, Layer III
*.mp4   audio/mp4, video/mp4    MPEG-4 Audio/Video
*.mpeg  video/mpeg  MPEG Video Stream, Layer II
*.mpg   video/mpeg  MPEG Video Stream, Layer II
*.mpp   application/vnd.ms-project  MS Project Project
*.ogg   application/ogg, audio/ogg  Ogg Vorbis
*.pdf   application/pdf Portable Document Format
*.png   image/png   Portable Network Graphics
*.pot   application/vnd.ms-powerpoint   MS PowerPoint Template
*.pps   application/vnd.ms-powerpoint   MS PowerPoint Slideshow
*.ppt   application/vnd.ms-powerpoint   MS PowerPoint Presentation
*.rtf   application/rtf, text/rtf   Rich Text Format
*.svf   image/vnd.svf   Simple Vector Format
*.tif   image/tiff  Tagged Image Format File
*.tiff  image/tiff  Tagged Image Format File
*.txt   text/plain  Plain Text
*.wdb   application/vnd.ms-works    MS Works Database
*.wps   application/vnd.ms-works    Works Text Document
*.xhtml application/xhtml+xml   Extensible HyperText Markup Language
*.xlc   application/vnd.ms-excel    MS Excel Chart
*.xlm   application/vnd.ms-excel    MS Excel Macro
*.xls   application/vnd.ms-excel    MS Excel Spreadsheet
*.xlt   application/vnd.ms-excel    MS Excel Template
*.xlw   application/vnd.ms-excel    MS Excel Workspace
*.xml   text/xml, application/xml   Extensible Markup Language
*.zip   aplication/zip  Compressed Archive
我这里没有单独放上传按钮,添加了onchange事件,在选择文件后立即上传文件,onchange时间定义如下。 
function filePictureChange() {$.ajaxFileUpload({url: "/Shared/Upload", //用于文件上传的服务器端请求地址type: "post",secureuri: false, //一般设置为falsefileElementId: "filePicture", //文件上传空间的id属性dataType: "json", //返回值类型 一般设置为jsonsuccess: function (data, status) { //服务器成功响应处理函数alert(data.fileName);alert(data.filePath);alert(data.fileSize);},error: function (data, status, e){ //服务器响应失败处理函数alert(e);}});};
后台控制器处理方法如下,使用MD5处理,判断文件是否已经存在,避免文件重复上传。 

/// <summary>/// 附件上传/// </summary>/// <returns></returns>public ActionResult Upload(){HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;if (files.Count == 0) return Json("Faild", JsonRequestBehavior.AllowGet);MD5 md5Hasher = new MD5CryptoServiceProvider();/*计算指定Stream对象的哈希值*/byte[] arrbytHashValue = md5Hasher.ComputeHash(files[0].InputStream);/*由以连字符分隔的十六进制对构成的String,其中每一对表示value中对应的元素;例如“F-2C-4A”*/string strHashData = System.BitConverter.ToString(arrbytHashValue).Replace("-", "");string FileEextension = Path.GetExtension(files[0].FileName);string uploadDate = DateTime.Now.ToString("yyyyMMdd");string virtualPath = string.Format("/Data/ComponentAttachments/{0}/{1}{2}", uploadDate, strHashData, FileEextension);string fullFileName = Server.MapPath(virtualPath);//创建文件夹,保存文件 string path = Path.GetDirectoryName(fullFileName);Directory.CreateDirectory(path);if (!System.IO.File.Exists(fullFileName)){files[0].SaveAs(fullFileName);}string fileName = files[0].FileName.Substring(files[0].FileName.LastIndexOf("\") + 1, files[0].FileName.Length - files[0].FileName.LastIndexOf("\") - 1);string fileSize = GetFileSize(files[0].ContentLength);return Json(new { FileName = fileName, FilePath = virtualPath, FileSize = fileSize }, "text/html", JsonRequestBehavior.AllowGet);}/// <summary>/// 获取文件大小/// </summary>/// <param name="bytes"></param>/// <returns></returns>private string GetFileSize(long bytes){long kblength = 1024;long mbLength = 1024 * 1024;if (bytes < kblength)return bytes.ToString() + "B";if (bytes < mbLength)return decimal.Round(decimal.Divide(bytes, kblength), 2).ToString() + "KB";elsereturn decimal.Round(decimal.Divide(bytes, mbLength), 2).ToString() + "MB";}
2 ajaxFileUpload使用过程中的一些问题
2.0 jQuery.handleError is not a function 


解决方法:
 经测试handlerError只在jquery-1.4.2之前的版本中存在,以后版本中都没有这个函数了,因此在将handleError这个函数复制到ajaxFileUpload.js中,就行了 

uploadHttpData: function (r, type) {var data = !type;data = type == "xml" || data ? r.responseXML : r.responseText;// If the type is "script", eval it in global contextif (type == "script")jQuery.globalEval(data);// Get the JavaScript object, if JSON is used.if (type == "json")eval("data = " + data);//eval("data = "" + data + """);// evaluate scripts within htmlif (type == "html")jQuery("<div>").html(data).evalScripts();return data;},handleError: function (s, xhr, status, e) {// If a local callback was specified, fire itif (s.error) {s.error.call(s.context || s, xhr, status, e);}// Fire the global callbackif (s.global) {(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);}}
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。