html5文件上传

htmL代码：

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<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：

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<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：

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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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