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html\xml\script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
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false fileElementId: "filePicture", //文件上传空间的id属性 dataType: "json", //返回值类型 一般设置为json success: 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"; else return 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 context if (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 html if (type == "html") jQuery("<div>").html(data).evalScripts(); return data; }, handleError: function (s, xhr, status, e) { // If a local callback was specified, fire it if (s.error) { s.error.call(s.context || s, xhr, status, e); } // Fire the global callback if (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。