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1/*
2 * jQuery Highlight plugin
3 *
4 * Based on highlight v3 by Johann Burkard
5 * http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html
6 *
7 * Code a little bit refactored and cleaned (in my humble opinion).
8 * Most important changes:
9 * - has an option to highlight only entire words (wordsOnly - false by default),
10 * - has an option to be case sensitive (caseSensitive - false by default)
11 * - highlight element tag and class names can be specified in options
12 *
13 * Usage:
14 * // wrap every occurrance of text 'lorem' in content
15 * // with <span class='highlight'> (default options)
16 * $('#content').highlight('lorem');
17 *
18 * // search for and highlight more terms at once
19 * // so you can save some time on traversing DOM
20 * $('#content').highlight(['lorem', 'ipsum']);
21 * $('#content').highlight('lorem ipsum');
22 *
23 * // search only for entire word 'lorem'
24 * $('#content').highlight('lorem', { wordsOnly: true });
25 *
26 * // don't ignore case during search of term 'lorem'
27 * $('#content').highlight('lorem', { caseSensitive: true });
28 *
29 * // wrap every occurrance of term 'ipsum' in content
30 * // with <em class='important'>
31 * $('#content').highlight('ipsum', { element: 'em', className: 'important' });
32 *
33 * // remove default highlight
34 * $('#content').unhighlight();
35 *
36 * // remove custom highlight
37 * $('#content').unhighlight({ element: 'em', className: 'important' });
38 *
39 *
40 * Copyright (c) 2009 Bartek Szopka
41 *
42 * Licensed under MIT license.
43 *
44 */
45
46jQuery.extend({
47 highlight: function (node, re, nodeName, className) {
48 if (node.nodeType === 3) {
49 var match = node.data.match(re);
50 if (match) {
51 var highlight = document.createElement(nodeName || 'span');
52 highlight.className = className || 'highlight';
53 var wordNode = node.splitText(match.index);
54 wordNode.splitText(match[0].length);
55 var wordClone = wordNode.cloneNode(true);
56 highlight.appendChild(wordClone);
57 wordNode.parentNode.replaceChild(highlight, wordNode);
58 return 1; //skip added node in parent
59 }
60 } else if ((node.nodeType === 1 && node.childNodes) && // only element nodes that have children
61 !/(script|style)/i.test(node.tagName) && // ignore script and style nodes
62 !(node.tagName === nodeName.toUpperCase() && node.className === className)) { // skip if already highlighted
63 for (var i = 0; i < node.childNodes.length; i++) {
64 i += jQuery.highlight(node.childNodes[i], re, nodeName, className);
65 }
66 }
67 return 0;
68 }
69});
70
71jQuery.fn.unhighlight = function (options) {
72 var settings = { className: 'highlight', element: 'span' };
73 jQuery.extend(settings, options);
74
75 return this.find(settings.element + "." + settings.className).each(function () {
76 var parent = this.parentNode;
77 parent.replaceChild(this.firstChild, this);
78 parent.normalize();
79 }).end();
80};
81
82jQuery.fn.highlight = function (words, options) {
83 var settings = { className: 'highlight', element: 'span', caseSensitive: false, wordsOnly: false };
84 jQuery.extend(settings, options);
85
86 if (words.constructor === String) {
87 words = [words];
88 }
89 words = jQuery.grep(words, function(word, i){
90 return word != '';
91 });
92 words = jQuery.map(words, function(word, i) {
93 return word.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
94 });
95 if (words.length == 0) { return this; };
96
97 var flag = settings.caseSensitive ? "" : "i";
98 var pattern = "(" + words.join("|") + ")";
99 if (settings.wordsOnly) {
100 pattern = "\\b" + pattern + "\\b";
101 }
102 var re = new RegExp(pattern, flag);
103
104 return this.each(function () {
105 jQuery.highlight(this, re, settings.element, settings.className);
106 });
107};
108