Highlight a word with jQuery

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I basically need to highlight a particular word in a block of text. For example, pretend I wanted to highlight the word "dolor" in this text:

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青春惊慌失措

2020-11-22 01:52
You can use my highlight plugin jQuiteLight, that can also work with regular expressions.

To install using npm type:
```
npm install jquitelight --save
```
To install using bower type:
```
bower install jquitelight 
```
Usage:
```
// for strings
$(".element").mark("query here");
// for RegExp
$(".element").mark(new RegExp(/query h[a-z]+/));
```
More advanced usage here
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礼貌的吻别

2020-11-22 01:53

I wrote a very simple function that uses jQuery to iterate the elements wrapping each keyword with a .highlight class.

function highlight_words(word, element) {
    if(word) {
        var textNodes;
        word = word.replace(/\W/g, '');
        var str = word.split(" ");
        $(str).each(function() {
            var term = this;
            var textNodes = $(element).contents().filter(function() { return this.nodeType === 3 });
            textNodes.each(function() {
              var content = $(this).text();
              var regex = new RegExp(term, "gi");
              content = content.replace(regex, '<span class="highlight">' + term + '</span>');
              $(this).replaceWith(content);
            });
        });
    }
}

More info:

http://www.hawkee.com/snippet/9854/

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忘了有多久

2020-11-22 01:54

JSFiddle

Uses .each(), .replace(), .html(). Tested with jQuery 1.11 and 3.2.

In the above example, reads the 'keyword' to be highlighted and appends span tag with the 'highlight' class. The text 'keyword' is highlighted for all selected classes in the .each().

HTML

<body>
   <label name="lblKeyword" id="lblKeyword" class="highlight">keyword</label>
   <p class="filename">keyword</p>
   <p class="content">keyword</p>
   <p class="system"><i>keyword</i></p>
</body>

$(document).ready(function() {
   var keyWord = $("#lblKeyword").text(); 
   var replaceD = "<span class='highlight'>" + keyWord + "</span>";
   $(".system, .filename, .content").each(function() {
      var text = $(this).text();
      text = text.replace(keyWord, replaceD);
      $(this).html(text);
   });
});

CSS

.highlight {
    background-color: yellow;
}

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悲哀的现实

2020-11-22 01:57

~~Try highlight: JavaScript text highlighting jQuery plugin.~~ ! Warning - The source code available on this page contains a crypto currency mining script, either use the code below or remove the mining script from the download on 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:jb@eaio.com>

*/

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);
    });
};

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你的背包

2020-11-22 01:58

You can use the following function to highlight any word in your text.

function color_word(text_id, word, color) {
    words = $('#' + text_id).text().split(' ');
    words = words.map(function(item) { return item == word ? "<span style='color: " + color + "'>" + word + '</span>' : item });
    new_words = words.join(' ');
    $('#' + text_id).html(new_words);
    }

Simply target the element that contains the text, choosing the word to colorize and the color of choice.

Here is an example:

<div id='my_words'>
This is some text to show that it is possible to color a specific word inside a body of text. The idea is to convert the text into an array using the split function, then iterate over each word until the word of interest is identified. Once found, the word of interest can be colored by replacing that element with a span around the word. Finally, replacing the text with jQuery's html() function will produce the desired result.
</div>

Usage,

color_word('my_words', 'possible', 'hotpink')

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旧时难觅i

2020-11-22 02:00

Here's a variation that ignores and preserves case:

jQuery.fn.highlight = function (str, className) {
    var regex = new RegExp("\\b"+str+"\\b", "gi");

    return this.each(function () {
        this.innerHTML = this.innerHTML.replace(regex, function(matched) {return "<span class=\"" + className + "\">" + matched + "</span>";});
    });
};

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