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    <p>Try <a href="http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html" rel="noreferrer">highlight: JavaScript text higlighting jQuery plugin</a>.</p> <pre><code>/* highlight v4 Highlights arbitrary terms. &lt;http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html&gt; MIT license. Johann Burkard &lt;http://johannburkard.de&gt; &lt;mailto:jb@eaio.com&gt; */ jQuery.fn.highlight = function(pat) { function innerHighlight(node, pat) { var skip = 0; if (node.nodeType == 3) { var pos = node.data.toUpperCase().indexOf(pat); if (pos &gt;= 0) { var spannode = document.createElement('span'); spannode.className = 'highlight'; var middlebit = node.splitText(pos); var endbit = middlebit.splitText(pat.length); var middleclone = middlebit.cloneNode(true); spannode.appendChild(middleclone); middlebit.parentNode.replaceChild(spannode, middlebit); skip = 1; } } else if (node.nodeType == 1 &amp;&amp; node.childNodes &amp;&amp; !/(script|style)/i.test(node.tagName)) { for (var i = 0; i &lt; node.childNodes.length; ++i) { i += innerHighlight(node.childNodes[i], pat); } } return skip; } return this.length &amp;&amp; pat &amp;&amp; pat.length ? this.each(function() { innerHighlight(this, pat.toUpperCase()); }) : this; }; jQuery.fn.removeHighlight = function() { return this.find("span.highlight").each(function() { this.parentNode.firstChild.nodeName; with (this.parentNode) { replaceChild(this.firstChild, this); normalize(); } }).end(); }; </code></pre> <p>Also try the <a href="http://bartaz.github.com/sandbox.js/jquery.highlight.html" rel="noreferrer">"updated" version of the original script</a>.</p> <pre><code>/* * jQuery Highlight plugin * * Based on highlight v3 by Johann Burkard * http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html * * Code a little bit refactored and cleaned (in my humble opinion). * Most important changes: * - has an option to highlight only entire words (wordsOnly - false by default), * - has an option to be case sensitive (caseSensitive - false by default) * - highlight element tag and class names can be specified in options * * Usage: * // wrap every occurrance of text 'lorem' in content * // with &lt;span class='highlight'&gt; (default options) * $('#content').highlight('lorem'); * * // search for and highlight more terms at once * // so you can save some time on traversing DOM * $('#content').highlight(['lorem', 'ipsum']); * $('#content').highlight('lorem ipsum'); * * // search only for entire word 'lorem' * $('#content').highlight('lorem', { wordsOnly: true }); * * // don't ignore case during search of term 'lorem' * $('#content').highlight('lorem', { caseSensitive: true }); * * // wrap every occurrance of term 'ipsum' in content * // with &lt;em class='important'&gt; * $('#content').highlight('ipsum', { element: 'em', className: 'important' }); * * // remove default highlight * $('#content').unhighlight(); * * // remove custom highlight * $('#content').unhighlight({ element: 'em', className: 'important' }); * * * Copyright (c) 2009 Bartek Szopka * * Licensed under MIT license. * */ jQuery.extend({ highlight: function (node, re, nodeName, className) { if (node.nodeType === 3) { var match = node.data.match(re); if (match) { var highlight = document.createElement(nodeName || 'span'); highlight.className = className || 'highlight'; var wordNode = node.splitText(match.index); wordNode.splitText(match[0].length); var wordClone = wordNode.cloneNode(true); highlight.appendChild(wordClone); wordNode.parentNode.replaceChild(highlight, wordNode); return 1; //skip added node in parent } } else if ((node.nodeType === 1 &amp;&amp; node.childNodes) &amp;&amp; // only element nodes that have children !/(script|style)/i.test(node.tagName) &amp;&amp; // ignore script and style nodes !(node.tagName === nodeName.toUpperCase() &amp;&amp; node.className === className)) { // skip if already highlighted for (var i = 0; i &lt; node.childNodes.length; i++) { i += jQuery.highlight(node.childNodes[i], re, nodeName, className); } } return 0; } }); jQuery.fn.unhighlight = function (options) { var settings = { className: 'highlight', element: 'span' }; jQuery.extend(settings, options); return this.find(settings.element + "." + settings.className).each(function () { var parent = this.parentNode; parent.replaceChild(this.firstChild, this); parent.normalize(); }).end(); }; jQuery.fn.highlight = function (words, options) { var settings = { className: 'highlight', element: 'span', caseSensitive: false, wordsOnly: false }; jQuery.extend(settings, options); if (words.constructor === String) { words = [words]; } words = jQuery.grep(words, function(word, i){ return word != ''; }); words = jQuery.map(words, function(word, i) { return word.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&amp;"); }); if (words.length == 0) { return this; }; var flag = settings.caseSensitive ? "" : "i"; var pattern = "(" + words.join("|") + ")"; if (settings.wordsOnly) { pattern = "\\b" + pattern + "\\b"; } var re = new RegExp(pattern, flag); return this.each(function () { jQuery.highlight(this, re, settings.element, settings.className); }); }; </code></pre>
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