Create two-character hotkeys in Javascript

Please have a look at the following page: [login to view URL] Currently hotkeys consist of one character, please make it so that we only accept two-character hotkeys (so we will get around 1000 possible hotkeys instead of the current 30 or so). The following video shows how to assign a hotkey and the result when using it: [login to view URL] Please also ensure that we can always use Control+F for the built in find function, so maybe this means that you have to make it so that the user cannot make any hotkey combinations involving the “f” key. Please also make it so that no characters that might have several purposes can be assigned as hotkeys. Currently, I believe that "backspace" can be assigned as hotkey which is unfortunate. "enter" and "space" keys are other ones and so on. Also it should not be possible to assign numbers as hotkeys, nor + nor -. I do not expect you to modify the persistence of hotkeys, as that will be done in a separate project afterwards (please indicate whether you are competent to do this using PostgreSQL). You can experiment with our code using the fancy web based IDE/test environment here: [login to view URL] You can use one of the following accounts to log into cloud9 (just modify the password to make it your own). KarlaZynda fxndgfk Lache usevery20 Charlote NWMUGF3N Brynnwor wordwork58 KailaBarde iuyismr SummerSump rfvbqke MitsuePosen cimgawc Genevie twounder33 Kristhi thinkthi41 Normant thethem61 Kashat theen39