ASPxClientUploadControlFileUploadCompleteEventArgs.callbackData Property

Gets a string that contains specific information (if any) passed from the server side for further client processing.

Declaration

callbackData: string

Property Value

Type	Description
string	A string value representing callback data passed from the server.

Remarks

Use the callbackData property to obtain specific information which has been collected on the server while handling the ASPxUploadControl.FileUploadComplete server event, and passed via the FileUploadCompleteEventArgs.CallbackData property to the client for final processing.

View Example: Upload Control for ASP.NET Web Forms - How to upload an image and display it on a web page

Example

ASPX

<script type="text/javascript">
     function onFileUploadStart(s, e) {
          DXUploadedFilesContainer.Clear();
     }
     function onFileUploadComplete(s, e) {
          if(e.callbackData) {
               var fileData = e.callbackData.split('|');
               var fileName = fileData[0],
                    fileUrl = fileData[1],
                    fileSize = fileData[2];
               DXUploadedFilesContainer.AddFile(fileName, fileUrl, fileSize);
          }
     }
</script>
    ...
<dx:ASPxUploadControl ID="UploadControl" runat="server" ClientInstanceName="UploadControl" Width="100%"
     NullText="Select multiple files..." UploadMode="Advanced" ShowUploadButton="True" ShowProgressPanel="True"
     OnFileUploadComplete="UploadControl_FileUploadComplete">
     <AdvancedModeSettings EnableMultiSelect="True" EnableFileList="True" EnableDragAndDrop="True" />
     <ValidationSettings MaxFileSize="4194304" AllowedFileExtensions=".jpg,.jpeg,.gif,.png">
     </ValidationSettings>
     <ClientSideEvents FilesUploadStart="onFileUploadStart" FileUploadComplete="onFileUploadComplete" />
</dx:ASPxUploadControl>

<dx:UploadedFilesContainer ID="FileContainer" runat="server" Width="100%" Height="180" 
     NameColumnWidth="240" SizeColumnWidth="70" HeaderText="Uploaded files" />

C#

const string UploadDirectory = "~/UploadControl/UploadImages/";

protected void UploadControl_FileUploadComplete(object sender, FileUploadCompleteEventArgs e) {
     string resultExtension = Path.GetExtension(e.UploadedFile.FileName);
     string resultFileName = Path.ChangeExtension(Path.GetRandomFileName(), resultExtension);
     string resultFileUrl = UploadDirectory + resultFileName;
     string resultFilePath = MapPath(resultFileUrl);
     //Save the uploaded file
     e.UploadedFile.SaveAs(resultFilePath);
     string name = e.UploadedFile.FileName;
     string url = ResolveClientUrl(resultFileUrl);
     long sizeInKilobytes = e.UploadedFile.ContentLength / 1024;
     string sizeText = sizeInKilobytes.ToString() + " KB";
     e.CallbackData = name + "|" + url + "|" + sizeText;
}

VB.NET

Private Const UploadDirectory As String = "~/UploadControl/UploadImages/"

Protected Sub UploadControl_FileUploadComplete(ByVal sender As Object, ByVal e As FileUploadCompleteEventArgs)
     Dim resultExtension As String = Path.GetExtension(e.UploadedFile.FileName)
     Dim resultFileName As String = Path.ChangeExtension(Path.GetRandomFileName(), resultExtension)
     Dim resultFileUrl As String = UploadDirectory & resultFileName
     Dim resultFilePath As String = MapPath(resultFileUrl)
     'Save the uploaded file
     e.UploadedFile.SaveAs(resultFilePath)
     Dim name As String = e.UploadedFile.FileName
     Dim url As String = ResolveClientUrl(resultFileUrl)
     Dim sizeInKilobytes As Long = e.UploadedFile.ContentLength / 1024
     Dim sizeText As String = sizeInKilobytes.ToString() & " KB"
     e.CallbackData = name & "|" & url & "|" & sizeText
End Sub