我正在尝试使用 HTML5 的 DnD 和 File API 上传文件。我不确定如何将表单数据发送到服务器，我尝试使用 XMLHttpRequest 发送但没有成功。这是我到目前为止所拥有的。
<body>
<form id="form1" runat="server" enctype="multipart/form-data">
<br />
<div id="drop_area">Drop files here</div> <br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button"/>
</form>
</body>
<script>
if (window.File && window.FileList && window.FileReader) {
var dropZone = document.getElementById('drop_area');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', handleDnDFileSelect, false);
}
else {
alert('Sorry! this browser does not support HTML5 File APIs.');
}
</script>
var files;
function handleDragOver(event) {
event.stopPropagation();
event.preventDefault();
var dropZone = document.getElementById('drop_zone');
dropZone.innerHTML = "Drop now";
}
function handleDnDFileSelect(event) {
event.stopPropagation();
event.preventDefault();
/* Read the list of all the selected files. */
files = event.dataTransfer.files;
/* Consolidate the output element. */
var form = document.getElementById('form1');
var data = new FormData(form);
for (var i = 0; i < files.length; i++) {
data.append(files[i].name, files[i]);
}
var xhr = XMLHttpRequest();
xhr.open("POST", "Upload.aspx"); //Wrong ? not sure.
xhr.setRequestHeader("Content-type", "multipart/form-data");
xhr.send(data);
}
C＃：
HttpFileCollection fileCollection = Request.Files;
for (int i = 0; i < fileCollection.Count; i++)
{
HttpPostedFile upload = fileCollection[i];
string filename ="c:\\Test\\" + upload.FileName;
upload.SaveAs(filename);
}
我知道我在 UI 中有一个按钮，到目前为止我没有使用。但正如您所看到的，我正在尝试使用 XMLHttpRequest 发送请求。谁能建议我如何进一步进行。但是我的服务器端代码永远不会被执行，我不确定 XMLHttpRequest 是否成功。