You can now add a class to an element that didn't already have a class.

[JulianBirch]

Hi, it's probably possible to make this code more efficent/elegant, but it's passing my manual tests.

Sorry, no test case because I'm having trouble getting your tests to run.

[cpetzold]

Hey Julian, can you explain the problem this is solving with a code sample?

[JulianBirch]

(Not at a dev computer right now, so apologies if this is garbage)

<div id='hello'>World</div>

(dommy/add-class! (sel1 :#hello) :world)

should trigger it. The basic problem is that if the element doesn't have a class, then class-name returns null, which means you can't call .split on the result.

As I say, sadly your tests don't work on my machine... :(

[jeluard]

It might be specific to some browser? It's working fine for me without the patch.

[JulianBirch]

It is, the code I've fixed is on the "doesn't support classlist" branch. The joke being that it affected Chrome when I wrote it, but Chrome now seems to support classlist. So, it only really affects IE versions now.

Anyway, as I said, the problem is that if you access className and there isn't a class, it returns nil rather than empty string.

[cpetzold]

The split is on classes, not class-name. It should be fine if class-name returns nil. Can you paste an error?

Also, the tests should work now after switching over to clojurescript.test.

[JulianBirch]

Sorry, it's class-index that assumes that class-name is not null. It calls .index on it.