Execute functions based on scroll index

[jbixon13]

Is it possible to execute arbitrary functions such as:

<script>
	let index 

	function count() {
		console.log('this executes upon scrolling to the third section');
	}

	if (index = 2) {
		count()
	}
</script>

This is possible in something like scrollama.js, and I would like to use svelte-scroller to do so if possible as it's already built into Svelte.

[jtrim-ons]

I think it should work if you do this:

$: if (index == 2) {
    count();
}

I've opened PR #14 to avoid repeated calls to the function (you could alternatively use another variable to keep track of whether index has changed from its previous value).

[maxgraze-zz]

Hello! I was wondering this too. I tried this as well but my function ended up getting called over 100 times and glitching.

[jtrim-ons]

@maxgraze here is the version where I tried to fix the issue of repeated function calls: https://github.com/jtrim-ons/svelte-scroller/blob/fewer-section-updates/Scroller.svelte . If you decide to give it a try, let us know if it works.