html5文件上传

htmL代码：

       <div class="row">
      <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
    </div>
    <div id="fileSize"></div>
    <div id="fileType"></div>
    <div class="row">
      <input type="button" onclick="uploadFile()" value="上传" />
    </div>
    <div id="progressNumber"></div>
                <progress max="100" id="progre" value="0"></progress>
                <br />
                <asp:Image ID="Image1"  Style="max-width:130px" runat="server" />
                <asp:HiddenField ID="hfimg" value="" runat="server" />

JS代码：

      <script type="text/javascript">
        function fileSelected() {
            var file = document.getElementById('fileToUpload').files[0];
            if (file) {
                var fileSize = 0;
                if (file.size > 1024 * 1024)
                    fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
                else
                    fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';


                document.getElementById('fileSize').innerHTML = '文件大小: ' + fileSize;
                document.getElementById('fileType').innerHTML = '文件类型: ' + file.type;
            }
        }

        function uploadFile() {
            var fd = new FormData();
            fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);
            var xhr = new XMLHttpRequest();
            xhr.upload.addEventListener("progress", uploadProgress, false);
            xhr.addEventListener("load", uploadComplete, false);
            xhr.addEventListener("error", uploadFailed, false);
            xhr.addEventListener("abort", uploadCanceled, false);
            xhr.open("POST", "/handler/h5upload.ashx");
            xhr.send(fd);
        }

        function uploadProgress(evt) {
            if (evt.lengthComputable) {
                var percentComplete = Math.round(evt.loaded * 100 / evt.total);
                document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
                document.getElementById('progre').value = percentComplete;
            }
            else {
                document.getElementById('progressNumber').innerHTML = 'unable to compute';
            }
        }

        function uploadComplete(evt) {
            /* This event is raised when the server send back a response */
          var json =eval("("+ evt.target.responseText+")");
          if (json.status=="no") {
              alert(json.info);
          }else{
            document.getElementById("<%=Image1.ClientID%>").src = json.path;
            document.getElementById("<%=hfimg.ClientID%>").value = json.path;
          }
        }

        function uploadFailed(evt) {
            alert("There was an error attempting to upload the file.");
        }

        function uploadCanceled(evt) {
            alert("The upload has been canceled by the user or the browser dropped the connection.");
        }
    </script>

后台ashx代码：

    context.Response.ContentType = "text/plain";
            HttpPostedFile  file =context. Request.Files["fileToUpload"];
            String fileName = file.FileName;
            String fileExt = Path.GetExtension(fileName).ToLower();

            //定义允许上传的文件扩展名
            Hashtable extTable = new Hashtable();
            extTable.Add("image", "gif,jpg,jpeg,png,bmp");
            extTable.Add("flash", "swf,flv");
            extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
            extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

            if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable["image"]).Split(','), fileExt.Substring(1).ToLower()) == -1)
            {
                context.Response.Write(LitJson.JsonMapper.ToJson(new { status="no", info = "上传文件扩展名是不允许的扩展名。
只允许" + ((String)extTable["image"]) + "格式。" }));

                return;
            }
            string dirpath = "/upload/"+DateTime.Now.ToString("yyyyMMdd")+"/";
            if (!Directory.Exists(context.Server.MapPath( dirpath)))
            {
                Directory.CreateDirectory(context.Server.MapPath(dirpath));
            }
            String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;

            file.SaveAs(context.Server.MapPath(dirpath) + newFileName);
            context.Response.Write(LitJson.JsonMapper.ToJson(new { status="ok",path = dirpath+newFileName}));

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