devexpress-examples/aspxgridview-batch-edit-how-to-use-the-upload-control-in-batch-edit-mode-t191652

Use the upload control in batch edit mode.

GridView for ASP.NET Web Forms - How to use the upload control in batch edit mode

This example illustrates how to use the upload control in batch edit mode. Note that all files are stored in memory until you call the update method.

Implementation Details

1. Place an upload control to a column's edit item template:

   <dx:GridViewDataTextColumn FieldName="FileName" Width="200">
       <EditItemTemplate>
           <dx:ASPxUploadControl ID="ASPxUploadControl1" runat="server" UploadMode="Advanced" Width="280px" ClientInstanceName="uc" FileUploadMode="OnPageLoad"
               OnFileUploadComplete="ASPxUploadControl1_FileUploadComplete">
               <ClientSideEvents TextChanged="OnTextChanged" FileUploadComplete="OnFileUploadComplete" />
           </dx:ASPxUploadControl>
       </EditItemTemplate>
   </dx:GridViewDataTextColumn>

2. Handle the grid's client-side BatchEditStartEditing event to set the grid's cell values to the upload control. Use the rowValues argument property to get the focused cell value:

   function OnBatchStartEditing(s, e) {
       browseClicked = false;
       hf.Set("visibleIndex", e.visibleIndex);
       var fileNameColumn = s.GetColumnByField("FileName");
       if (!e.rowValues.hasOwnProperty(fileNameColumn.index))
           return;
       var cellInfo = e.rowValues[fileNameColumn.index];
   
       setTimeout(function () {
           SetUCText(cellInfo.value);
       }, 0);            
   }

3. Handle the grid's client-side BatchEditConfirmShowing event to prevent data loss on the upload control's callbacks:

   function OnBatchConfirm(s, e) {
       e.cancel = browseClicked;
   }

   This browseClicked flag is set to true when the upload control starts uploading a file and to false when the file has been uploaded or a user starts editing another cell.

4. Handle the upload control's client-side TextChanged and FileUploadComplete events to automatically upload the selected file and update the cell value after:

   function OnFileUploadComplete(s, e) {
       grid.batchEditApi.SetCellValue(hf.Get("visibleIndex"), "FileName", e.callbackData);
       grid.batchEditApi.EndEdit();
   }
   function OnTextChanged(s, e) {
       if (s.GetText()) {
           browseClicked = true;
           s.Upload();
       }
   }

5. Handle the upload control's FileUploadComplete event to store the uploaded file in the session:

   protected void ASPxUploadControl1_FileUploadComplete(object sender, FileUploadCompleteEventArgs e) {
       var name = e.UploadedFile.FileName;
       e.CallbackData = name;
   
       if (Files.ContainsKey(hiddenField["visibleIndex"]))
           Files[hiddenField["visibleIndex"]] = e.UploadedFile.FileBytes;
       else
           Files.Add(hiddenField["visibleIndex"], e.UploadedFile.FileBytes);
   }

Now you can access all the uploaded files in the BatchUpdate event handler. Clear the session storage after you have updated the files.

Files to Review

• Default.aspx (VB: Default.aspx)
• Default.aspx.cs (VB: Default.aspx.vb)

More Examples

*Grid View for ASP.NET Web Forms - How to implement an edit item template in batch mode *GridView for ASP.NET MVC - How to use the upload control in batch edit mode