RadAsyncUpload File Filtering

Updated on Apr 20, 2026

As of 2026 Q1 SP2, the legacy IFrame, Silverlight and Flash modules have been removed from the source code. This change improves the compatibility with modern browsers and hardens the security of the RadAsyncUpload control. As a result, the FileFilters property is no longer functional and should not be used.

To set file filtering on modern browsers, use the accept attribute of the input type="file" element. For example, this will allow most images:

JavaScript

function pageLoad() {
    $telerik.$('.ruFileInput').attr('accept', 'image/*');
}

You can find a more detailed example in the How to filter file selection in the upload dialog article.

See Also

• How to filter file selection in the upload dialog

• RadAsyncUpload Validation Demo

• RadAsyncUpload Upload Modules