7

What I am trying to do: As stated in the title, I want to set the CSS of a word if it is a reserved word.

HTML 

<html>
    <body>
        <code id="java">
            public static void main(String[] args)<br>
            {
                <pre>    System.out.println("Hello World!");</pre>
            }
        </code>
    </body>
</html>

jQuery

$(document).ready(function()
{
    // Get the text inside the code tags
    var code  = $("#java").text();

    // Split up each word
    var split = code.split(' ');

    // Array of reserved words
    var array = ["abstract","assert","boolean","break","byte","case",
                 "catch","char","class","const","continue","default",
                 "do","double","else","else if","enum","extends","final",
                 "finally","float","for","goto","if","import","implements",
                 "instanceof","int","interface","long","native","new","null",
                 "package","private","protected","public","return","short",
                 "static","strictfp","super","switch","synchronized","this",
                 "throw","throws","transient","void","volatile","while"];

    // Added when text contains a reserved word
    var css = {'font-weight':'bold','color':'#2400D9'}

    array = jQuery.map(array, function(n,i)
    {
        for (int j=0; j<array.length; j++)
        {
            if (split[i].contains(array[j]))
                split[i].css(css);
        }
    });
});

Problem: I have referred to the documentation for several methods (in the references section below), but I'm not too sure where the problem(s) lies. To narrow the issue down, my question(s) would be...

  1. Is .split() even a method in jQuery?
  2. Should I use a for loop to run through all the words in the array (to see if the code contains a reserved word) or is there a better approach (such as .each())?
  3. If I should use .each(), could someone please give me a simple example? I don't understand the examples in the documentation.

References

Improve this question
4
  • jQuery is JavaScript and uses JavaScript methods all the time. Check this post, it may help a lot - stackoverflow.com/questions/784012/… Commented Mar 16, 2012 at 21:19
  • .split() is a string method in JavaScript. So it's also a string method in jQuery ;). Commented Mar 16, 2012 at 21:19
  • 1
    btw, $.each() performs a bit slower than native JS for loop (jsperf.com/jquery-vs-lowdash-loops/4), but it's much more convenient to use. When there are not a lot of elements I prefer .each(). With more elements performance difference starts showing and then I usually use a usual for loop. Commented Nov 16, 2013 at 3:55
  • @ArmanBimatov Not if I'm running Firefox 24.0... ;) Commented Nov 19, 2013 at 2:47

2 Answers 2

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4

If I understood correctly, you can achieve what you want using $.inArray and wrapping the reserved word with a span tag. See my DEMO

Edit: Below is from jQuery $.inArray documentation.

$.inArray( value, array [, fromIndex] ) -

valueThe value to search for.

arrayAn array through which to search.

fromIndexThe index of the array at which to begin the search. The default is 0, which will search the whole array.

..read more..

CSS

.code {
    font-weight: bold;
    color: #2400D9;
}

JS

$(document).ready(function() {
    // Get the text inside the code tags
    var code = $("#java").html();

    // Split up each word
    var split = code.split(' ');

    // Array of reserved words
    var array = ["abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "default", "do", "double", "else", "else if", "enum", "extends", "final", "finally", "float", "for", "goto", "if", "import", "implements", "instanceof", "int", "interface", "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "void", "volatile", "while"];

    for (var j = 0; j < split.length; j++) {
        if ($.inArray(split[j], array) > 0) {
            split[j] = '<span class="code">' + split[j] + '</span>';
        }
    }

    $("#java").html(split.join(' '));
});
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4 Comments

Cool! Could you please explain the $.inArray(split[j], array)? Mainly the $.inArray part.
@MikeDtrick See my edits. You can read more about it clearly in jQuery documentation.
I don't think it would be wise to start up a new question, but I was wondering... if I wanted to run through another for loop to check and see if any digits were in the code, should I follow what you wrote for the for loop (with exception to the span class=... and array) or do something else?
@MikeDtrick Check my DEMO for digit highlighting .
2

I asked myself this question a few months ago, after a lot of searching I found this:

http://forum.jquery.com/topic/wrapping-specific-words-inside-span-elements#14737000001028912

which I addapted into the following jQuery plugin:

$.fn.applyKeyword = function(opt, selector) {
    var numOfKeys = opt.keys.length;

    if (typeof selector == 'undefined') {
        selector = ":visible:not(:input):not(label):not(select)";
    }

    for (var i = 0; i < numOfKeys; i++) {
        if (opt.keys[i].partials) {
            var re = new RegExp("(" + opt.keys[i].keyword + ")", 'ig');
        } else {
            var re = new RegExp("(\\b" + opt.keys[i].keyword + "\\b)", 'ig');
        }
        $(selector, this).contents().filter(function() {
            return this.nodeType != 1;
        }).each(function() {
            var output = $(this).text().replace(re, opt.keys[i].prefix + "$1" + opt.keys[i].suffix);
            if (output != $(this).text()) {
                $(this).wrap("<p></p>").parent('p').html(output).contents().unwrap();
            }
        })
    }
}

It doesn't have a way to 'undo' the keyword wrapping but it suited my needs.

If you need an example how to implement this I'd be happy to make one if you provide some text I can test it on....

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7 Comments

Can also capture partial matches of strings through the use of regexes; if you expect a lot of keywords / text this might be a bit heavy. It uses the element you use it with as a scope as to limiting in which elements to check.
I've gotta admit this is quite complex (I started using jQuery about a month ago). I'm glad you mentioned the plugin because I've followed several tutorials on how to set one up, but I have no idea how to "compile" one (if that makes any sense). Do you save your plugin as a .js file and call it in an id or class of a tag?
A plugin is basically just a 'property' you add to the jQuery object; it just so happens to be a function so it can be called using braces ()... This is just basic JS; but for more information on how to write a plugin check this link to an official tutorial
If it helps you anything here is the plugin I wrote to teach myself how to do it; it isn't great at what it does but it does use the plugin style as suggested in the tutorial I linked and is semantic / documented enough to be able to read through it without a headache
I referred to that tutorial about a week ago and couldn't follow it very well. Thank you for the link to your plugin! I'll be sure to look it over.
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