I am slowly making up a set of blog posts about the components of content management systems, starting with the earlier one on content repositories . Coming up next will probably be templating systems.

In the beginning the web was editable in the browser. Tim Berners Lee made it so. But this did not last for long. Eventually Microsoft restored this, to some extent, with the contentEditable properties and related Javascript interfaces. Now these have a lot of foibles, and the current HTML5 standardization has not done a huge amount of work here yet, certainly not adding new features or changing the basic interface substantially, so a lot of behaviour is currently underdefined, which makes cross browser compatibility more difficult. While the main desktop browsers all implement the interface, mobile ones do not in general yet, even on form fators such as the iPad, which could very well be an effective content editing device.

Should you use one at all?

Almost every CMS supports wysywig HTML editing, but it is not entirely clear how much they are used. To be quite blunt, they have always been among the worst editing environments ever devised, overlaid with a poor HTML model and a tendency towards presentational markup. Most users do their editing elsewhere, at least for originating content. I think though that we are at the point where this can be improved.

The first thing is to kill the presentational markup, and instead support customised semantic use of classes. On the basic level this is easy to implement; there is probably more work to easily support more advanced HTML templates, for example to mark up recipes or other specialist content in consistent semantic ways through this type of interface. Pluggable schema guidance might be needed for this.

The second is to make the editors themselves sane. First step is of course local offline HTML5 storage, so that drafts are still there if you wander off, your computer runs out if battery or whatever. Then just make them nicer to use, keyboard friendly and so on.

Then there is the concurrency question, you may want to show concurrent editing, and the versioning model that applies. This does not have to be the Google Wave style simultaneous editng, although that is one option. People may be editing content for release in different versions.

Import from other editors is of course still important, and making it as painless as possible for the common tools is of course important.

Also, remember it is an editor, people like a choice of editors, so loosely couple it, make it standalone and easily changed.

What not to use

Old school implementations, with nothing now to recommend them that I can see; often they seem to need server side components too, which should not be required now when pure Javascript solutions should be sufficient.

Some nice demos available , indeed probably the best demo site of any editor. Aims to fix up the issues and cross browser quirks contentEditable, and looks nice too. Open Source.

Other ways 1: Canvas

A survey of what is up is not complete without mentioning Skywriter , which is a (code) editor written entirely in canvas. As far as I can see this is an utterly pointless approach long run. It is especially a bad idea for HTML, where fitting in with the CSS of the page matters, so lets ignore this.

Other ways 2: pure Javascript

You can in principle implement the whole of a contentEditable-like editor in pure Javascript, using a little div as a cursor and everything, no help at all from the browser. That is a lot of work, of course. I know of two implementations, one being the 2010 release of Google Docs , which explains why the did that, in order to be able to provide the best cross browser support. The other implementation I know of is the one for Squiz CMS , no online demo, not open source and tied into one product. This is pretty functional although it had some browser compatibility issues last time I used it, and ther website still says it does not support Webkit.

Other ways 3: Markdown and Wiki markup

I have to say I use Markdown a lot, this blog is generally written in it. There are two issues I see. One is that it is limited, and while you can add native HTML, this often means everything has to be redone in HTML (trying to add anchors to a list for example). There are extensions with more features, but then you get into compatibility issues. ALso there is no sanely reversible transformation that will generate the sme output as there are notational choices, so it is generally best to keep the content in Markdown all the way through. There are much the same issues with Wiki markup, although it is extensible too, which causes more issues of trying to remember constructs, and compatibility is weakened. The difficulty is that HTML is not a very good markup for humans to write, but once you get past the very restricted domain that say Markdown handles, producing something that works well is hard, maybe impossible.

Other ways 4: Don?t use HTML

A number of people I have worked with, and some content management systems go with a very minimalist use of HTML, pretty much text is paragraphs, everything else is structured fields. A slightly enhanced version of this, effectively a very minimalist tiny markup, corresponding to even less than Markdown is the COPE system .

Personally I believe we need to expand the use of rich text, for many use cases ?just the words? is not enough, and we need equations, images, notes, asides, sidebars, tables, captions, and all the richness of rich text, so I don?t think this is viable for much serious writing, and we need to expand from the dumbed down web that this enforces.

Concluding

While the wysiwyg editor as it has been in content management systems is pretty awful, I think we need to expand the principle and try to do better, go back to the really editable web, and support well structured semantic HTML in rich ways, not forms and simple text boxes. There is a lot to do to get this working though still.

Advertisements