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isCapsLockEnabled.js

This script causes an alert message to pop up if the user types a character and caps lock is enabled.

  1. // ==UserScript==
  2. // @name         isCapsLockEnabled.js
  3. // @namespace    https://bitbucket.org/azuelsdorf16
  4. // @version      1.0.0
  5. // @date         23 February 2015
  6. // @description  This script causes an alert message to pop up if the user types a character and caps lock is enabled.
  7. // @author       Andrew Zuelsdorf
  8. // @include      https://*
  9. // @include      http://*
  10. // @grant        none
  11. // ==/UserScript==
  12.  
  13. //For use with Chrome Developer Tools debuggin
  14. debugger;
  15.  
  16. function isAlpha(character) {
  17.     if (character >= String.fromCharCode(0x41) &&
  18.         character <= String.fromCharCode(0x5A)) {
  19.         return true;
  20.     }
  21.     else if (character >= String.fromCharCode(0x61) &&
  22.         character <= String.fromCharCode(0x7A)) {
  23.         return true;
  24.     }
  25.     else if (character >= String.fromCharCode(0xC0) &&
  26.              character <= String.fromCharCode(0x2B8)) {
  27.         return true;
  28.     }
  29.     else if (character >= String.fromCharCode(0x363) &&
  30.              character <= String.fromCharCode(0x1FFF)) {
  31.         return true;
  32.     }
  33.     else {
  34.         return false;
  35.     }
  36. }
  37.  
  38. var continuePopupMessages = true;
  39.  
  40. document.onkeypress = function(e) {
  41.     if (continuePopupMessages) {
  42.         e = e || window.event;
  43.         var s = String.fromCharCode(e.keyCode || e.which);
  44.         if ((s.toUpperCase() === s && !e.shiftKey) || (e.shiftKey && s.toLowerCase() === s)) {
  45.             if (isAlpha(s)) {
  46.                 continuePopupMessages = (true === confirm("Caps lock is on! Press \"Cancel\" to stop receiving this message on this page. Press \"OK\" otherwise"));
  47.             }
  48.         }
  49.     }
  50. };