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Protect browser keyboard shortcuts

Stop websites from highjacking some keyboard shortcuts

  1. // ==UserScript==
  2. // @name        Protect browser keyboard shortcuts
  3. // @description Stop websites from highjacking some keyboard shortcuts
  4. // @author      Alex Efros <powerman-asdf@ya.ru>
  5. // @run-at      document-start
  6. // @include     *
  7. // @grant       none
  8. // @version     1.2
  9. // @namespace   https://github.com/powerman/userjs-protect-browser-shortcuts
  10. // ==/UserScript==
  11.  
  12. (function(document){
  13. 	'use strict';
  14.  
  15. 	var shortcuts = [
  16. 		{input:false, ctrl:false, alt:false, meta:false, shift:false, code:'Slash'},
  17. 	];
  18. 	var shortcuts_len = shortcuts.length;
  19.  
  20. 	var protectKeys = function(e) {
  21. 		// console.log(e)
  22. 		for (var i=0; i<shortcuts_len; i++) {
  23. 			var k = shortcuts[i];
  24. 			if (!k.input && (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA')) {
  25. 				continue;
  26. 			}
  27. 			if (e.ctrlKey  === k.ctrl  &&
  28. 			    e.altKey   === k.alt   &&
  29. 			    e.metaKey  === k.meta  &&
  30. 			    e.shiftKey === k.shift &&
  31. 			    e.code     === k.code
  32. 			    ) {
  33. 				// console.log("shortcut protected")
  34. 				e.cancelBubble = true;
  35. 				e.stopPropagation();
  36. 				e.stopImmediatePropagation();
  37. 				// e.preventDefault();
  38. 				return false;
  39. 			}
  40. 		}
  41. 	};
  42.  
  43. 	document.addEventListener('keydown',  protectKeys);
  44. 	document.addEventListener('keypress', protectKeys);
  45. 	document.addEventListener('keyup',    protectKeys);
  46.  
  47. })(document);