Restricting uploading files based on its extension

24 Jul 20191 minute to read

Allow Extension

Files are filtered before they are uploaded. You can select the files to be filtered by using the Browse button.
The ExtensionAllow property allows upload of the selected extensions only. You can give multiple extensions by using comma (,). The data type is string.

NOTE

Prepend dot (.) symbol with extension like “.pdf”.

The following steps explain the configuration of the ExtensionAllow property in the UploadBox.

In the ASPX page, add the UploadBox element.

  • HTML
    • <ej:UploadBox ID="UploadBox" runat="server" SaveUrl="SaveFiles.ashx" RemoveUrl="RemoveFiles.ashx" ExtensionsAllow=".docx,.pdf" MultipleFilesSelection="true"> 

</ej:UploadBox>

    NOTE

    The SaveUrl and RemoveUrl are the same as above (see Save File Action and Remove File Action section).

    The following screenshot displays the output when multiple files of different file types are selected and only the allowed file extensions are uploaded.

    Allow Extension

    Deny Extension

    Files are filtered before they are uploaded. You can select the files to be filtered by using the Browse button. The ExtensionDeny property denies upload of the selected extensions. You can give multiple extensions by using comma (,). The data type is string.

    NOTE

    Prepend dot (.) symbol with extension like “.pdf”.

    The following steps explain the configuration of the ExtensionDeny property in the UploadBox

    In the ASPX page, add the UploadBox element.

  • HTML
    • <ej:UploadBox ID="UploadBox" runat="server" SaveUrl="SaveFiles.ashx" RemoveUrl="RemoveFiles.ashx" ExtensionsDeny=".docx,.pdf" MultipleFilesSelection="true">

</ej:UploadBox>

    NOTE

    The SaveUrl and RemoveUrl are the same as above (see Save File Action and Remove File Action section).

    The following screenshot displays the output when multiple files of different file types are selected and the denied file extensions are not uploaded.

    Deny Extension

    NOTE

    When ExtensionsDeny and ExtensionsAllow properties have same file extension, the extension will be allowed.