Updated 2013-12-09 to use much simpler code

One thing that is nice about Prism is that it provides hooks to extend the syntax highlighting, so it is straightforward to create a plugin that adds features like my line numbering, so I can do things like:

<pre><code class="language-javascript" data-linenumber=4>
function foo(arg){
  console.log('You said: '+arg);

Download the code.

Download the CSS (the linenumbering parts are at the bottom).

See an example (working together with the line highlighting plugin)(note that Chrome requires an explicit line-height on the <pre> to work).

You use the plugin simply by including the script after loading Prism, then adding the data-linenumber attribute to the code element, as in <code class="language-javascript" data-linenumber><code>. The default first line is 0 (we're computer scientists after all!). Change it by assigning a value to the data-linenumber attribute, as in <code class="language-javascript" data-linenumber=4><code>.

As I discussed before, the code element must have a style of counter-reset: something and each line is wrapped in a <span class="line"> element, and those must have a style of counter-increment: something. Then the span.line:before selector needs a style of content: counter(something).

Hope this helps someone!



  1. Vahid says:

    Thanks for sharing.
    I need it.

  2. Cretu Eusebiu says:

    Hi, this plugin is great but I have one problem, if I have more than one commented line this happens: http://i.imgur.com/9dYFsvZ.jpg. Any idea how I could fix that ?

  3. Danny says:

    @Cretu Eusebiu:
    Yes, that’s an odd bug I’ve noted but haven’t figured out yet. It seems to show up only if the first line is a comment; then subsequent comments that start on the first character aren’t counted. Simple workaround: add a space before the comment.

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