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Restrict files with no extension
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This is a migrated thread and some comments may be shown as answers.
WAMatt
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WAMatt asked on 14 Sep 2012, 01:36 PM
Greetings,

I would like to allow users to upload any type of file except ones with no extension.  Any ideas how to do this?

Your help is appreciated!

Matt

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Plamen
Telerik team
answered on 18 Sep 2012, 11:36 AM
Hello Matt,

 
One way to achieve such validation is to check the uploading file's name in the OnClientFileUploading event as in the code below:

function OnClientFileUploading(sender, args) {
                var file = args.get_fileName();
                var extension = file.substr((file.lastIndexOf('.') + 1));
                if (extension == file) {
                    args.set_cancel(true);
                };
            }

Hope this will help you solve the issue.

Kind regards,
Plamen
the Telerik team
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WAMatt
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answered on 18 Sep 2012, 02:45 PM
Thank you, that got me part-way there.  I am still unsure how to handle the file to prevent the upload.  Here is what I am doing...

JavaScript...
<script type="text/javascript">
  function uplFileUpload_OnClientFileUploading(sender, args) {
    var file = args.get_fileName(); var
    extension = file.substr((file.lastIndexOf('.') + 1));
    if (extension == file) {
      args.set_cancel(true);           
    }
  }
</script>

ASPX...
<table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr class="pulldown_fields">
    <td width="30%" style="font-weight: bold" align="right">
      Upload Files
    </td>
    <td width="3%">
        
    </td>
    <td>
      <telerik:RadAsyncUpload ID="uplFileUpload" runat="server" UploadedFilesRendering="BelowFileInput"
        MultipleFileSelection="Automatic" OnClientFileUploading="uplFileUpload_OnClientFileUploading">
      </telerik:RadAsyncUpload>
      <br />
      <telerik:RadButton ID="btnFileUpload" runat="server" Text="Save Files" Icon-PrimaryIconCssClass="rbSave"
        OnClick="btnFileUpload_Click">
      </telerik:RadButton>
      <asp:Label ID="errFileUpload" runat="server" ForeColor="Red" />
    </td>
  </tr>
</table>

CP...
protected void btnFileUpload_Click(object sender, EventArgs e)
{
  saveAttachments(1000);
}
private void saveAttachments(int folderNumber)
{
  resetValidation();
  errFileUpload.Text = "";
  if (!Directory.Exists(Server.MapPath("~/Uploads/" + folderNumber.ToString())))
  {
    Directory.CreateDirectory(Server.MapPath("~/Uploads/" + folderNumber.ToString()));
  }
  if (uplFileUpload.UploadedFiles.Count > 0)
  {
    try
    {
      foreach (UploadedFile file in uplFileUpload.UploadedFiles)
      {
        file.SaveAs(Server.MapPath("~/Uploads/" + folderNumber.ToString() + "/" + file.GetName()), true);
        saveChangeLog("DeceasedMember",
                  Convert.ToInt32(hdnDeceasedMemberID.Value),
                  file.GetName() + " has been uploaded");
      }
      errFileUpload.Text = uplFileUpload.UploadedFiles.Count.ToString() + " file(s) were uploaded";
    }
    catch (Exception)
    {
      errFileUpload.Text = "Unable to upload file(s)";
    }
  }
  else
  {
    errFileUpload.Text = "Select a file first";
  }
}

It flags the file in the uploaded files list with a red dot, but it still allows it to be uploaded when I click the Save button.  What am I missing?

Thanks again!

Matt
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Plamen
Telerik team
answered on 21 Sep 2012, 10:19 AM
Hi Matt,

 
This issue is a known limitation observed only in the Silverlight Upload module and if you want to avoid it you can add the following javascript to the page:

Telerik.Web.UI.RadAsyncUpload.Modules.Silverlight.isAvailable = function() { return false; }

Hope this will help you solve the issue.

Greetings,
Plamen
the Telerik team
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WAMatt
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answered on 24 Sep 2012, 02:47 PM
This gives me an error: "Telerik is not defined".  I went ahead and dealt with this using server-side code...
private void saveAttachments(int folderNumber)
{
  resetValidation();
  errFileUpload.Text = "";
  if (!Directory.Exists(Server.MapPath("~/Uploads/" + folderNumber.ToString())))
  {
    Directory.CreateDirectory(Server.MapPath("~/Uploads/" + folderNumber.ToString()));
  }
  if (uplFileUpload.UploadedFiles.Count > 0)
  {
    try
    {
      int cnt = 0;
      string msg = "";
      foreach (UploadedFile file in uplFileUpload.UploadedFiles)
      {
        msg = "";
        if (file.GetExtension() != "")
        {
          cnt++;
          file.SaveAs(Server.MapPath("~/Uploads/" + folderNumber.ToString() + "/" + file.GetName()), true);
        }
        else
        {
          msg = " All uploaded files must have an extension.";
        }
      }
      errFileUpload.Text = cnt.ToString() + " file(s) were uploaded." + msg;
    }
    catch (Exception)
    {
      errFileUpload.Text = "Unable to upload file(s)";
    }
  }
  else
  {
    errFileUpload.Text = "Select a file first";
  }
}


Matt
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WAMatt
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Plamen
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WAMatt
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