We are using the RadAsyncUpload with the RadProgressManager/RadProgressArea and a custom HttpHandler to handle the uploads. In IE10, Chrome, Firefox and others, everything works as it should. However on IE8, IE9 and probably others (6,7) the progress area is never displayed. Enabling chunk uploads solves the problem however it's not an option as we need to use the HttpHandler.
I included the markup for the RadAsyncUpload.
I included the markup for the RadAsyncUpload.
<
telerik:RadAsyncUpload
runat
=
"server"
MaxFileInputsCount
=
"25"
DisableChunkUpload
=
"true"
HttpHandlerUrl
=
"~/Common/httpHandlers/UploadHandler.ashx"
Skin
=
"Office2010Blue"
EnableFileInputSkinning
=
"true"
HideFileInput
=
"True"
InputSize
=
"75"
Width
=
"720px"
EnableInlineProgress
=
"False"
ID
=
"rfUpload"
DropZones
=
"#dz"
MultipleFileSelection
=
"Automatic"
OnClientFilesUploaded
=
"ocfu"
OnClientFileUploadRemoved
=
"OnClientFileUploadRemoved"
OnClientFileUploaded
=
"onClientFileUploadedNorm"
OnClientAdded
=
"OnClientAdded"
ChunkSize
=
"0"
/>