[英]Ajax file upload in ASP.NET - files not seen by handler
這是我第一次嘗試通過 Ajax 和 .ashx 上傳文件。 我正在使用 FireFox 75.0，當我查看我的 web 控制台時，我在frm.append(files[i], files[i].name); 我在我的腳本中看到附加到 FormData() object 的文件和/或文件（文件輸入具有“多個”屬性）。 文件輸入控件 (HTML5) 有一個觸發 javascript 的“onchange”事件。 JavaScript 似乎工作正常。 但是，我的處理程序文件看不到 HttpFileCollection。 我無法弄清楚為什么這不起作用，所以我正在尋求幫助。
這是 ASPX 頁面代碼：
<!DOCTYPE html>
<html>
<head runat="server">
<title></title>
<link href="../../assets/css/bootstrap.css" rel="stylesheet" />
<link href="../../assets/css/OLF_style.css" rel="stylesheet" />
<script type="text/javascript" src="../../scripts/jquery-3.3.1.js"></script>
<script type="text/javascript" src="../../scripts/bootstrap.min.js"></script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<div class="row" id="rw_5887" style="border-bottom: 1px inset #e0e0e0;">
<div class="col-sm-3 txtmd txright" style="padding: 4px 10px 4px 4px;color:#333333"><label for="DocUpload">Upload File</label></div>
<div class="col-sm-9 txtmd" style="padding: 4px 4px 4px 4px;;color:#999999"><img id="upload_files" src="../../assets/img/btn_upload01.png" alt="Upload File" style="margin: 7px 10px 0px 10px" /><input id='fupDocUpload' type='file' accept=".docx;.doc" multiple='multiple' class='form-control' style='display:none;height:0px;width:0px' onchange="doFileSelect();" /><div id="uploadstatus" style="display: inline"></div>
<br /><progress id="fileProgress" style="display: none"></progress>
<br /><div id="dvFileUploads" class="gradlt txtreg rnd" style="height: 60px;width:90%;"></div><input type="hidden" id="hfFilesUploaded" />
</div>
</div>
</form>
<script type="text/javascript">
var fileupload = $("#fupDocUpload");
var imgbtn = $("#upload_files");
imgbtn.click(function () {
$(fileupload).click();
});
function doFileSelect() {
$("#uploadstatus").html('Upload in progress...');
var fileInput = $('#fupDocUpload').get(0);
var frm = new FormData();
var files = [];
files = fileInput.files;
var ufiles = $("#hfFilesUploaded").val();
for (var i = 0; i < files.length; i++) {
frm.append(files[i], files[i].name);
if ($("#hfFilesUploaded").val() == '') {
$("#dvFileUploads").append(files[i].name);
$("#hfFilesUploaded").val(files[i].name);
} else {
$("#dvFileUploads").append(', ' + files[i].name);
$("#hfFilesUploaded").val(ufiles + ',' + files[i].name);
}
}
$.ajax({
url: 'handler/UploadHandler.ashx',
type: 'POST',
data: frm,
cache: false,
contentType: false,
processData: false,
success: function (result) {
$("#fileProgress").hide();
$("#uploadstatus").html(result);
window.setTimeout(clrStatus, 2000);
},
xhr: function () {
var fileXhr = $.ajaxSettings.xhr();
if (fileXhr.upload) {
$("progress").show();
fileXhr.upload.addEventListener("progress", function (e) {
if (e.lengthComputable) {
$("#fileProgress").attr({
value: e.loaded,
max: e.total
});
}
}, false);
}
return fileXhr;
}
});
}
function clrStatus() {
var status = $('#uploadstatus').html('');
}
</script>
</body>
</html>
這是我的處理程序代碼：
Imports System
Imports System.Web
Imports System.IO
Public Class UploadHandler : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
context.Response.ContentType = "text/html"
Dim files As HttpFileCollection = context.Request.Files()
Dim UploadPath As String = ConfigurationManager.AppSettings("FormFileUpload")
'Dim strFiles As String = String.Empty
Try
If context.Request.Files.Count = 0 Then
context.Response.Write("<img src=""../../assets/img/NotAllowed.png"" alt="""" style=""margin-left: 5px; margin-right: 5px"" /> No Files Found!")
Else
For i As Integer = 0 To files.Count - 1
Dim file As HttpPostedFile = files(i)
Dim fname As String = String.Empty
fname = file.FileName
fname = Replace(fname, " ", "_") 'Replace spaces in file name
fname = Path.Combine(context.Server.MapPath(UploadPath), fname)
file.SaveAs(fname)
Next
context.Response.Write("<img src=""../../assets/img/CkMark.png"" alt="""" style=""margin-left: 5px"" />")
End If
Catch ex As Exception
context.Response.Write("<img src=""../../assets/img/NotAllowed.png"" alt="""" style=""margin-left: 5px; margin-right: 5px"" /> Error!" & ex.ToString())
End Try
End Sub
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
End Class
在我的處理程序的 Try Catch 塊中，它檢查文件計數，它看不到文件。 當我在 web 控制台中單擊網絡選項卡時，它總是返回“未找到文件”：我看到了文件對象 - Content-Disposition； 表格數據； 名稱="[目標文件]"
測試.docx
如果有人能告訴我我缺少什么以及如何解決它，我將不勝感激。 謝謝！
雖然我的網站不是 MVC，但在查看了該網站上的代碼（ https://www.yogihosting.com/jquery-file-upload/ ）並進行了視圖更改后，我能夠得到這個工作。
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