Before change hooks

[elliotlings]

Is it possible to add a before slide change hook, so that you can stop a slide change doing it's default functionality and move to a different a slide entirely?

[hakimel]

I've wanted a preventable event like this myself in the past. Just pushed a first iteration of it to master.

// This will prevent all slide changes
Reveal.addEventListener( 'slidechange', e => e.preventDefault() )

What should this event be called? slidechange might be too similar to slidechanged which is dispatched after. Perhaps beforeslidechanged?

[Martinomagnifico]

beforeslidechanged sounds good to me. Maybe even beforeslidechange, because if a 'change' takes time, it would mean that the slide could have already started changing, but not finished changing. (which is more like slidetransitionend)

[hakimel]

I've renamed to beforeslidechange. Will add it to the docs once when the next release goes out.

[Medioman92]

it would be great if there was information about the direction in the event. Something like:
slideChangeDirection:'left' or slideChangeDirection:'right' slideChangeDirection:'up' or slideChangeDirection:'down'