:active pseudo-class

[jlongster]

I have a list view that uses TouchableHighlight for each item. I'd like to be able to customize the styles of the underlay that is active when I touch an item. Right now the only thing possible is underlayColor. What are the chances we could something like an :active pseudo-class?

In fact, how do you do pseudo-classes when you do CSS in JS anyway?

[vjeux]

Look at TouchableWithoutFeedback to implement your custom touchable element.

However, be warned that this is a very dangerous path. One of the big reasons why native apps feel native is because those touchable elements have been put a lot of thoughts into.

I'd love to know what your use case is to help you find the best implementation

[irvinebroque]

@jlongster - here's an example of a :hover pseudo-class with CSS in JS:

https://gist.github.com/irvinebroque/a4530228bdab51fa3939

[jlongster]

Since I realized I could use an rgba color for the underlay, I'm good (was thinking of opacity). I agree, I don't want to re-implement the "active" behavior of a touchable. I was just saying that you could allow more display-related properties than just backgroundColor, though now I'm having a hard time coming up with a good use case.

@irvinebroque that's cool, but on the web, you still couldn't access :after and :before elements in the more general pseudo-class case.

[vjeux]

The other common use case on iOS is opacity. We're going to bring it to the oss repo soon :)

[irvinebroque]

@jlongster - true, but you can render new DOM elements based on state, which covers the more general case, no? For example:

https://gist.github.com/irvinebroque/520871ff44042b91b518 (scenario where you might otherwise use a pseudo element's content to render a tooltip)

The only pseudo selectors I've been unable to implement purely in React have been browser specific like ::-webkit-input-placeholder

[jlongster]

Yeah, the need for before and after are mitigated I suppose. Anyway, thanks for the responses, there's not really anything actionable here so I'll close it.