Unfortunately, I don’t know of any way javascript tricks to detect when the file download dialog is displayed to the user. Without being able to hook in to that event, the UI will remain blocked forever, forcing the user to either close and re-open their browser or hit the back button to get away from the “Please Wait” message. There’s no solution for disabling “Save”, “Download”, “Print” options for a pdf. First of all when you are sending the pdf o end user (client), different browser use different mechanism to render o pdf and show it to user. Once browser receives PD Is there a way to hide the Submit button until a field has been populated by a lookup, through either a Rule or Javascript, to prevent the form from being submitted without data? 2 0 Post Link Join a community of over 2.6m developers to have your questions answered on diasalbe upload button till file is selected of UI for ASP.NET AJAX Upload (Obsolete). New here? Start with our free trials.