*[data-markdown] - use markdown, sometimes, in your HTML

readme.md

*[data-markdown]

I just put some markdown in ur HTML

In prototypes and HTML-based slide decks, it's pleasant to write in markdown sometimes and avoid all those angle brackets.

So the idea is you're operating in an HTML environment but a few shortcuts would help so use markdown here and there.

To use:

1. Add the following script into your HTML after the content, before other scripts

• It automatically adds github flavored markdown's if it's not already in.

1. Add data-markdown attributes to any tags where you're gonna use markdown within. (see example)

Userscript or script-script

This script works fine in your page and can also be used as a userscript. Just click the raw link right below to install.

(As this requires some clientside js and can trigger FOUC, this is not for production use)

data-markdown.user.js

// ==UserScript==
// @name Use Markdown, sometimes, in your HTML.
// @author Paul Irish <http://paulirish.com/>
// @link http://git.io/data-markdown
// @match *
// ==/UserScript==


// If you're not using this as a userscript just delete from this line up. It's cool, homey.

(function boom(){
  
  if (!window.Showdown){
    var scr = document.createElement('script');
    scr.onload = boom;
    scr.src = 'https://cdn.rawgit.com/showdownjs/showdown/master/src/showdown.js';
    document.body.appendChild(scr);
    return;
  }

  [].forEach.call( document.querySelectorAll('[data-markdown]'), function  fn(elem){
      
    // strip leading whitespace so it isn't evaluated as code
    var text      = elem.innerHTML.replace(/\n\s*\n/g,'\n'),
        // set indentation level so your markdown can be indented within your HTML
        leadingws = text.match(/^\n?(\s*)/)[1].length,
        regex     = new RegExp('\\n?\\s{' + leadingws + '}','g'),
        md        = text.replace(regex,'\n'),
        html      = (new Showdown.converter()).makeHtml(md);

    // here, have sum HTML
    elem.innerHTML = html;

  });

}());

example.html

<div class="slide">
 <section class="hbox" data-markdown>
  ## Who Am I?

  * Lead developer of [Modernizr](//modernizr.com)
  * Project lead of [HTML5 Boilerplate](//h5bp.com)
  * I curate that [page of polyfills](//bit.ly/polyfills)
  * Member of jQuery Team
  * Developer Relations on Google Chrome team
  </section>
</div>



<script src="data-markdown.user.js"></script>

@Digitalsabre actually, for my version of Google Chrome (which is pretty much the stable on), it tries to install the script, but fails with an "invalid script header" (which makes sense, in a way, I suppose).

Correction, after fixing the header (Chrome does not like @match *), the result is a page with no body content.
In Firefox, it just doesn't do anything at all.

@espadrine Try removing line 5. It should install, but then it just returns a page with no body content.

@Digitalsabre ... which is clearly not what we want ;)

@espadrine This is, admittedly, my first time working with user scripts. I really want this to work, so I hope someone comes to help us get it working.

@paulirish, @timmolendijk, @CPATIK, any ideas? After forking, I've replaced // @match * with // @include *, but still GreaseMonkey does nothing. I've even added a GM_log('running...'); to the script and it doesn't appear to output that to the console. And since doing this, it will actually install in Chrome, but the result is a blank page. Check my fork for what I've done there, including fleshing out the example page.

Now we're getting somewhere:

Uncaught ReferenceError: Showdown is not defined
script.js:20

@Digitalsabre Showdown is defined in GitHub Flavored Markdown, in the document.write.

@espadrine Sure, but Chrome doesn't seem to think so.

@Digitalsabre No more of this bug with this implementation: https://gist.github.com/1349268 (but hey, still doesn't do what we want ey!

@espadrine, @Digitalsabre This works: https://gist.github.com/1349945 The trick is you have to run your code in the context of the page, not of the userscript. Bonus (untested): it should work in Firefox (Greasemonkey or Scriptish), Chrome, and Opera.

@espadrine @Digitalsabre @passcod Sounds like you guys need an unsafeWindow polyfill: https://gist.github.com/1143845

@mathiasbynens No we don't, because my version runs the code directly into the page, therefore going out of the GM scope as fast as possible. A few years ago I developed this technique exactly because I was tired of playing with unsafeWindow, polyfill or not.

very cool!! rock on man...

Just updated the code. fixes:

• Chrome wasn't treating the document.write as synchronous so now we're using a script onload. feels good man
• indentation level of the source can be arbitrary, which lets you indent the markdown within your HTML. We compute how much indent to treat as default with the first line.

and it works as is in html5slide too! excelent.

What about using the following to get the markdown content

var text      = elem.innerHTML.replace(/\n\s*\n/g,'\n');

Instead of the following. This would give a better support for html embeded in markdown, no ?

var text      = elem.textContent.replace(/\n\s*\n/g,'\n');

sgtm. changed.

This has now been implemented in the very excellent reveal.js:
https://github.com/hakimel/reveal.js#markdown

Swag!

Does this not work when ran on a local .html page??

@paulirish ? Or do we need to call boom();??

Please fix to https://cdn.rawgit.com/showdownjs/showdown/master/src/showdown.js for the showdown @paulirish

It was working fine for you ? I tried it and zero results.

how does it works