HTML5實現上傳文件顯示進度的代碼分享

這篇文章主要介紹“HTML5實現上傳文件顯示進度的代碼分享”，在日常操作中，相信很多人在HTML5實現上傳文件顯示進度的代碼分享問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”HTML5實現上傳文件顯示進度的代碼分享”的疑惑有所幫助！接下來，請跟著小編一起來學習吧！

代碼如下:

@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>
}

相關的Javascript是這樣的：

代碼如下:

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事件執行fileSelected的function，在點擊button執行了uploadFile的function，這里使用XMLHttpRequest實現ajax上傳文件。 注意代碼在Firefox 14 可以工作，IE 9目前不支持file api，可以參加這里。 服務端的代碼很簡單：

代碼如下:

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");
}
}

到此，關于“HTML5實現上傳文件顯示進度的代碼分享”的學習就結束了，希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學習，快去試試吧！若想繼續學習更多相關知識，請繼續關注億速云網站，小編會繼續努力為大家帶來更多實用的文章！