[Solved] Cancelling 'onUpload' client event removes file

[Jon]

Hi.

I'm using the onUpload client event to perform some validation of other controls that I use to provide metadata to be sent to the server (i.e. a file description).  If the validation fails, I display a suitable message to the user, and call e.preventDefault().

However, when I do this the selected file is removed from the queue.  This is not an action that I want to happen, as it forces the user to re-select the file, even though it was not the cause of the validation failure.

Is there some way to prevent this default behaviour?  (I've amended the performUpload function in 'telerik.upload.js' for now, but I obviously don't want to amend the core code in the long run.)

Thanks,

Jon Knight

(Excellent controls, by the way!)

[T. Tsonev]

Hi Jon,

I agree that removing the file when the Upload event is cancelled is not valid in every scenario. We'll consider our options for giving the developer more control.

Our suggestion is to disable the "Upload selected" button until all inputs are filled in. Changing the source is valid as well, but you should keep an eye on the change log for any important modifications in the Upload.

Greetings,
Tsvetomir Tsonev
the Telerik team