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    HTML5上传文件显示进度的实现代码
    这里我们是结合Asp.net MVC做为服务端,您也可以是其它的服务端语言。让我们看面这个片断的HTML:

    复制代码
    代码如下:

    @using (Html.BeginForm("Upload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" , id="form1"}))
    {
    <div class="row">
    <label for="file">
    Upload Image:</label>
    <input type="file" name="fileToUpload" id="fileToUpload" multiple="multiple" onchange="fileSelected();" />
    </div>
    <div id="fileName">
    </div>
    <div id="fileSize">
    </div>
    <div id="fileType">
    </div>
    <div class="row">
    <input type="button" onclick="uploadFile()" value="Upload Image" />
    </div>
    <div id="progressNumber">
    </div>
    }

    相关的Javascript是这样的:

    复制代码
    代码如下:

    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('fileName').innerHTML = 'Name: ' + file.name;
    document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
    document.getElementById('fileType').innerHTML = 'Type: ' + 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", "Home/Upload");
    xhr.send(fd);
    }
    function uploadProgress(evt) {
    if (evt.lengthComputable) {
    var percentComplete = Math.round(evt.loaded * 100 / evt.total);
    document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
    }
    else {
    document.getElementById('progressNumber').innerHTML = 'unable to compute';
    }
    }
    function uploadComplete(evt) {
    /* This event is raised when the server send back a response */
    alert(evt.target.responseText);
    }
    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.");
    }

    上面是就原生的Javascript,在onchange事件执行fileSelected的function,在点击button执行了uploadFile的function,这里使用XMLHttpRequest实现ajax上传文件。 注意代码在Firefox 14 可以工作,IE 9目前不支持file api,可以参加这里。 服务端的代码很简单:

    复制代码
    代码如下:

    public class HomeController : Controller
    {
    public ActionResult Index()
    {
    return View();
    }
    /// <summary>
    /// Uploads the specified files.
    /// </summary>
    /// <param name="fileToUpload">The files.</param>
    /// <returns>ActionResult</returns>
    [HttpPost]
    public ActionResult Upload(HttpPostedFileBase[] fileToUpload)
    {
    foreach (HttpPostedFileBase file in fileToUpload)
    {
    string path = System.IO.Path.Combine(Server.MapPath("~/App_Data"), System.IO.Path.GetFileName(file.FileName));
    file.SaveAs(path);
    }
    ViewBag.Message = "File(s) uploaded successfully";
    return RedirectToAction("Index");
    }
    }

    作者:Petter Liu
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