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Lepro Total Comments JS

lepro total comments JS

当前为 2016-07-16 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Lepro Total Comments JS
  3. // @description  lepro total comments JS
  4. // @license      MIT
  5. // @namespace    leprosorium.ru
  6. // @include      http://leprosorium.ru/comments/*
  7. // @include      http://*.leprosorium.ru/comments/*
  8. // @include      http*://leprosorium.ru/comments/*
  9. // @include      http*://*.leprosorium.ru/comments/*
  10. // @copyright    2016, lynxtaa
  11. // @grant        none
  12. // @version      1.3
  13. // ==/UserScript==
  14.  
  15.  
  16. var BEST_TRESHOLD = 0.75;
  17.  
  18. var controls = document.getElementById('js-comments').querySelector('.b-comments_controls'),
  19. 	comments_holder = document.getElementById('js-comments_holder'),
  20. 	style = document.createElement('style'),
  21. 	best = document.createElement('a'),
  22. 	all = document.createElement('a'),
  23. 	std_dev,
  24. 	comments = [];
  25.  
  26. style.textContent = ".is_hidden { display: none; }";
  27. document.body.appendChild(style);
  28.  
  29. controls.querySelector('a[data-key="sort"]').className = '';
  30.  
  31. // Кнопки управления
  32. best.textContent = 'лучшие';
  33. all.textContent = 'все';
  34. controls.appendChild(best);
  35. controls.appendChild(all);
  36.  
  37.  
  38. // Лучшее
  39. best.addEventListener('click', function(e) {
  40. 	e.preventDefault();
  41. 	// var start = new Date().getTime();
  42. 	if (this.className === 'active') {
  43. 		return false;
  44. 	} else if (std_dev) {
  45. 		document.body.appendChild(style);
  46. 	} else {
  47. 		var votes = comments_holder.querySelectorAll('strong.vote_result'),
  48. 			best_count = votes.length,
  49. 			comment;
  50. 		std_dev = (getStdDev(votes) || 0.1);
  51. 		for (var i = 0; i < comments.length; i++) {
  52. 			if (comments[i].rating / std_dev < BEST_TRESHOLD) {
  53. 				comment = comments[i].el.parentNode.parentNode.parentNode.parentNode;
  54. 				if (comment.classList.contains('comment')) {
  55. 					comment.classList.add('is_hidden');
  56. 				} else {
  57. 					throw new Error('Can\'t find comment container.');
  58. 				}
  59. 				best_count--;
  60. 			}
  61. 		}
  62. 		this.setAttribute('title', best_count);
  63. 	}
  64. 	// var end = new Date().getTime();
  65. 	// var time = end - start;
  66. 	// alert('Execution time: ' + time);
  67. 	this.className = 'active';
  68. 	this.nextSibling.className = '';
  69. }, false);
  70.  
  71.  
  72. // Показать всё
  73. all.addEventListener('click', function(e) {
  74. 	e.preventDefault();
  75. 	if (std_dev && this.className !== 'active') {
  76. 		this.className = 'active';
  77. 		this.previousSibling.className = '';
  78. 		document.body.removeChild(style);
  79. 	}
  80. }, false);
  81.  
  82.  
  83. // Среднеквадратическое отклонение
  84. function getStdDev(votes) {
  85. 	var	abovenull = 0,
  86. 		rating_square_sum = 0,
  87. 		rating_sum = 0,
  88. 		rating,
  89. 		vote;
  90.  
  91. 	for (var i = 0; i < votes.length; i++) {
  92. 		vote = votes[i];
  93. 		rating = parseInt(vote.textContent);
  94. 		comments.push({	el: vote, rating: rating });
  95. 		if ( rating > 0 ) {
  96. 			abovenull++;
  97. 			rating_sum += rating;
  98. 			rating_square_sum += Math.pow(rating, 2);
  99. 		}
  100. 	}
  101. 	
  102. 	abovenull = (abovenull || 1);
  103. 	return Math.sqrt( (rating_square_sum / abovenull) -
  104. 				Math.pow((rating_sum / abovenull), 2) );
  105. }