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Focus input text field on Esc

Focus the first visible input text field when you press Esc key, or restore the previously focused element on second press

当前为 2016-03-11 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name          Focus input text field on Esc
  3. // @description   Focus the first visible input text field when you press Esc key, or restore the previously focused element on second press
  4. // @version       1.0.4
  5. // @include       *
  6. // @author        wOxxOm
  7. // @namespace     wOxxOm.scripts
  8. // @license       MIT License
  9. // @run-at        document-start
  10. // ==/UserScript==
  11.  
  12. var TEXT_FIELD = ' search text number url ';
  13. var previousElement;
  14. var first;
  15.  
  16. document.addEventListener('keydown', function(e) {
  17. 	if (e.keyCode != 27 || e.altKey || e.ctrlKey || e.shiftKey || e.metaKey)
  18. 		return;
  19. 	// find text inputs inside visible DOM containers
  20. 	var inputs = document.getElementsByTagName('input');
  21. 	for (var i=0, input, il=inputs.length; i<il && (input=inputs[i]); i++) {
  22. 		var priority = TEXT_FIELD.indexOf(' '+input.type+' ');
  23. 		if (priority >= 0) {
  24. 			var n=input, style;
  25. 			while (n && n.style && (style=getComputedStyle(n)) && style.display!='none' && style.visibility!='hidden')
  26. 				n = n.parentNode;
  27. 			if (!n || !n.style) {
  28. 				if (!first // set the first OR if it's empty, try to select an identically named input field with some text (happens on some sites)
  29. 						|| (input.value && input.name == first.name && (!input.form && !first.form || input.form.action == first.form.action))) {
  30. 					first = input;
  31. 					if (first.value)
  32. 						break;
  33. 				}
  34. 			}
  35. 		}
  36. 	}
  37.  
  38. 	if (first) {
  39. 		if (first != document.activeElement) {
  40. 			// switch to the found input field
  41. 			previousElement = document.activeElement;
  42. 			onkeyup(function(){
  43. 				first.focus();
  44. 				first.select();
  45. 			});
  46. 		} else if (previousElement) {
  47. 			// restore focus to the element from which we jumped to an input field previously
  48. 			onkeyup(function(){
  49. 				document.activeElement.blur(); // in case document.body (page "background") was previously selected
  50. 				previousElement.focus();
  51. 			});
  52. 		}
  53. 	}
  54.  
  55. 	// focusing should be done at key-up to prevent the Esc-keydown being also chain-handled by the just focused element
  56. 	function onkeyup(cb) {
  57. 		document.addEventListener('keyup', function keyup(e) {
  58. 			if (e.keyCode == 27) {
  59. 				document.removeEventListener('keyup', keyup);
  60. 				cb(e);
  61. 			}
  62. 		});
  63. 	}
  64. });