Javascript – How to detect browser’s protocol handlers


I have created a custom URL protocol handler.




I have registered a WinForms application to respond accordingly. This all works great.

But I would like to be able to gracefully handle the case where the user doesn't have the custom URL protocol handler installed, yet.

In order to be able to do this I need to be able to detect the browser's registered protocol handlers, I would assume from JavaScript. But I have been unable to find a way to poll for the information. I am hoping to find a solution to this problem.

Thanks for any ideas you might be able to share.

Best Solution

This would be a very, very hacky way to do this... but would this work?

  • Put the link in as normal...
  • But attach an onclick handler to it, that sets a timer and adds an onblur handler for the window
  • (in theory) if the browser handles the link (application X) will load stealing the focus from the window...
  • If the onblur event fires, clear the timer...
  • Otherwise in 3-5seconds let your timeout fire... and notify the user "Hmm, looks like you don't have the Mega Uber Cool Application installed... would you like to install it now? (Ok) (Cancel)"

Far from bulletproof... but it might help?