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RadUpload has been replaced by RadAsyncUpload, Telerik’s next-generation ASP.NET upload component. If you are considering Telerik’s Upload control for new development, check out the documentation of RadAsyncUpload or the control’s product page. If you are already using RadUpload in your projects, you may be interested in reading how easy the transition to RadAsyncUpload is and how you can benefit from it in this blog post. The official support for RadUpload has been discontinued in June 2013 (Q2’13), although it is still be available in the suite. We deeply believe that RadAsyncUpload can better serve your upload needs and we kindly ask you to transition to it to make sure you take advantage of its support and the new features we constantly add to it.

The OnClientDeletingSelected client-side event occurs when the selected rows are about to be deleted in response to the Delete button or a call to the deleteSelectedFileInputs() method.

The event handler receives two parameters:

  1. The instance of the RadUpload control firing the event.

  2. An eventArgs parameter containing the following methods:

    • set_cancel lets you prevent the selected rows from being deleted.

    • get_cancel returns whether the deletion has been cancelled.

    • get_fileInputFields returns an array containing the file input fields that are about to be deleted.

    • get_rows returns an array containing the rows that are about to be deleted

    • get_rowIndexes returns an array containing the indexes of the rows to be deleted

The following example uses the OnClientDeletingSelected event to confirm the deletion of rows where at least one selected row has a selected file:

<telerik:RadUpload runat="server" id="RadUpload1" onclientdeletingselected="confirmDeletions">
function confirmDeletions(radUpload, eventArgs) {
    var inputs = eventArgs.get_fileInputFields();
    var filesSelected = false;
    for (i = 0; i<inputs.length; i++) {
        if (inputs[i].value.length > 0) {
            filesSelected = true;
    if (filesSelected) {
        eventArgs.set_cancel(!confirm("You have selected files that will not be uploaded if" +
            " you delete the selected controls. Do you want to continue anyway?"));

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