I found the events list here:
docs.dhtmlx.com/doku.php?id=dhtm … nts_form&s[]=onUploadComplete
I don’t see events that occur when a file is dropped or selected via the browser dialog. I would like to hook the event and test the file type (jpg for example) prior to uploading and reject the file. I can do it in the handler but It won’t get to the handler until after the data is sent to the server. Rejecting it in JS limits server load.