Try highlight: JavaScript text highlighting jQuery plugin.
Warning: The source code available on this page contains a cryptocurrency mining script, either use the code below or remove the mining script from the script downloaded from the website.
/*
highlight v4
Highlights arbitrary terms.
<http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html>
MIT license.
Johann Burkard
<http://johannburkard.de>
<mailto:[email protected]>
*/
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 >= 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 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
for (var i = 0; i < node.childNodes.length; ++i) {
i += innerHighlight(node.childNodes[i], pat);
}
}
return skip;
}
return this.length && pat && 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();
};
Also try the "updated" version of the original script.
/*
* 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 <span class='highlight'> (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 <em class='important'>
* $('#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 && node.childNodes) && // only element nodes that have children
!/(script|style)/i.test(node.tagName) && // ignore script and style nodes
!(node.tagName === nodeName.toUpperCase() && node.className === className)) { // skip if already highlighted
for (var i = 0; i < 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(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
});
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);
});
};
<span>, it is more correct to use<mark>, semantically speaking. – Execrate