Last Updated: 17 Jul 2020 15:07 by Diogo Mendonça
Created by: Diogo Mendonça
Comments: 2
Category: AsyncUpload
Type: Bug Report


I have a problem with postback on RadAsyncUpload in my project.

So, I created a simple project, with your example ( and the problem remains.

if I define PostbackTriggers on the aspx page, after the post back, I can see the files uploaded on the page, but the UploadedFiles.Count in code behind returns zero.

<telerik:RadAsyncUpload runat="server" ID="RadAsyncUpload1" PostbackTriggers="Button3,Button4"></telerik:RadAsyncUpload>

if I define PostbackTriggers on the aspx.vb page, after the post back I can't see the files uploaded on the page, but the UploadedFiles.Count in code behind returns 1.

RadAsyncUpload1.PostbackTriggers = New String() {Button1.ClientID, Button2.ClientID}


So, there is no way to, after the postback, present the uploaded files in page and values in  RadAsyncUpload.UploadedFiles.


Please, check the attach files.

Best Regards,

Mauro Santos

Last Updated: 19 Feb 2020 12:55 by ADMIN
Release R1 2020 SP1
Created by: Jeff Cuddigan
Comments: 0
Category: AsyncUpload
Type: Bug Report

This issue is observed only in R1 2020. The solution is to not disable the FileAPI.

Reproduction steps:

    Telerik.Web.UI.RadAsyncUpload.Modules.FileApi.isAvailable = function () { return false; };
    Telerik.Web.UI.RadAsyncUpload.Modules.Flash.isAvailable = function () { return false; };
    Telerik.Web.UI.RadAsyncUpload.Modules.Silverlight.isAvailable = function () { return false; };
<telerik:RadAsyncUpload runat="server" ID="RadAsyncUpload1" ></telerik:RadAsyncUpload>

Last Updated: 09 Apr 2019 15:06 by ADMIN

Documentation says Firefox should be ok with LastModifiedDate, but it's not.  It's consistently being set to 1/1/0001 12:00:00 AM, which is not useful.

Happens in any RadAsyncUpload example if you look at the value for LastModifiedDate in the AsyncUploadedFile objects.

Works fine in Chrome, Edge.  Fails in Firefox for Mac or Windows.

Last Updated: 15 Mar 2019 08:33 by ADMIN
Created by: Alex Kapitanovskyy
Comments: 1
Category: AsyncUpload
Type: Bug Report
After the update from version 2018.2.710 to 2019.1.2015 the files bigger than 2 MB are cut off (up to 2 MB) and broken during the upload.
Last Updated: 08 Mar 2019 09:39 by ADMIN
When the ChunkSize of RadAsyncUpload is set the files are not fully uploaded. A sample excel file to reproduce the issue is attached to this reply.
Temporary fix:
Remove the ChunkSize setting of the AsyncUploade:

        <telerik:RadAsyncUpload ID="UploadFile" runat="server" MultipleFileSelection="Automatic"
            OverwriteExistingFiles="true" ReadOnlyFileInputs="true" InputSize="45" EnableViewState="true" TargetFolder="~/UploadedFiles">

Steps to reproduce:

1. Run the following configuration and upload the attached to this item file
        <telerik:RadAsyncUpload ID="UploadFile" ClientIDMode="AutoID" runat="server" MultipleFileSelection="Automatic"
            OverwriteExistingFiles="true" ReadOnlyFileInputs="true" ChunkSize="3145728" InputSize="45" EnableViewState="true" TargetFolder="~/UploadedFiles">
        <telerik:RadButton runat="server" Text="Upload"></telerik:RadButton>

Expected: An 11MB file is uploaded
Actual: An 8MB file is uploaded (the last chunk part is missing)

Last Updated: 14 Aug 2018 11:24 by ADMIN
Created by: Rumen
Comments: 0
Category: AsyncUpload
Type: Bug Report
The drop zone and the custom drop zones are shifted below their expected positions in Edge 40.

Check the following video demonstration

The problem is reproducible in the demo.
Last Updated: 30 Nov 2017 16:28 by ADMIN

function encodeRowContent() {
    var asyncUpload = $find('<%= RadAsync_FileUpload.ClientID%>');
    var $ = $telerik.$;
    asyncUpload._updateRowContent = function (row, inputValue) {
        var $progress,
            $content = $("<span class='ruUploadProgress'>" + $telerik.htmlEncode(this._getFileName(inputValue)) + "</span>");

                .addClass("ruFileLI ruUploading")
                .prepend("<span class='radIcon'></span>");

        if (this._isManualUpload())

        if (this._enableInlineProgress) {
            $progress = $('<span class="ruFileProgressWrap"><span class="ruFileProgress"></span></span>');

        $('.ruFakeInput, .ruBrowse', row).remove();
        $(".ruFileWrap", row).append($content); // Replace fake input


Last Updated: 24 Apr 2017 13:26 by ADMIN
Created by: Vessy
Comments: 0
Category: AsyncUpload
Type: Bug Report
File drag and drop is broken in MS Edge Creator's Edition. Reproducible in the following demo:

Last Updated: 02 Nov 2016 00:47 by Polymorphic Solutions
Last Updated: 14 Jul 2016 08:20 by ADMIN
Last Updated: 13 Jul 2016 13:11 by ADMIN
Last Updated: 06 Jul 2016 13:49 by ADMIN
Under Review
Last Updated: 27 Jun 2016 15:19 by ADMIN
Upgrading to UI for ASP.NET AJAX Q2 2015 (2015.2.729.45) sets requestLimits maxAllowedContentLength in web.config to 

<requestLimits maxAllowedContentLength="0" /> <!--8MB Max upload-->

resulting in errors like "PRM_ServerError" on postbacks.
Last Updated: 05 May 2016 11:46 by ADMIN
Last Updated: 04 Apr 2016 13:22 by ADMIN
Last Updated: 07 Jan 2016 16:46 by ADMIN
Won't Fix
Last Updated: 01 Oct 2015 14:56 by ADMIN
Set DisablePlugins="true" or
set RenderMode="Lightweight"
Last Updated: 12 Aug 2015 16:01 by Ryan
when deleting files from radasyncupload via the "built-in" delete button, both the upload_removing and upload_removed events are fired. However, when deleting files via the api, only the uploadRemoved event is fired.

to reproduce: 
1. run attached web form. select file for upload. click remove button. view console. note console entries have text "filename in UPloadRemoving.." as well as "filename in UploadRemoved...". Good

2. click the "delete via api" checkbox to enable. select another file. view console. Note console entry only has text "filename in UploadRemoved..." bad.
1 2