svelte-scrollto

Svelte-scrollto

Animating vertical and horizontal scrolling

Install

npm install --save-dev svelte-scrollto
# or
yarn add -D svelte-scrollto

Usage

<script>
  import * as animateScroll from "svelte-scrollto";
</script>

<a on:click={() => animateScroll.scrollToBottom()}> Scroll to bottom </a>
<a on:click={() => animateScroll.scrollToTop()}> Scroll to top </a>
<a on:click={() => animateScroll.scrollTo({element: 'scroll-to-element-selector'})}> Scroll to element </a>
<a on:click={() => animateScroll.scrollTo({element: 'scroll-to-element-selector', offset: 200})}> Scroll to below element 200px </a>
<a on:click={() => animateScroll.scrollTo({element: 'scroll-to-element-selector', duration: 2000})}> Scroll to element over 2000ms </a>

Using as a action

<script>
  import { scrollto } from "svelte-scrollto";
</script>
<!-- Parameter is element selector or options -->
<a use:scrollto={'#scroll-element'}> Scroll to element </a>

API

Global Options

Option	Required	Default value	Description
container	✔	"body"	Scroll container
duration	✔	500	The duration (in milliseconds) of the scrolling animation.
delay		0
offset		0	The offset that should be applied when scrolling. This option accepts a callback function
easing		cubicInOut	The easing function to be used when animating. Can pass any easing from svelte/easing or pass custom easing function.
onStart		noop	A callback function that should be called when scrolling has started. Receives the target element and page offset as a parameter.
onDone		noop	A callback function that should be called when scrolling has ended. Receives the target element and page offset as a parameter.
onAborting		noop	A callback function that should be called when scrolling has been aborted by the user (user scrolled, clicked etc.). Receives the target element and page offset as parameters.
scrollX		false	Whether or not we want scrolling on the x axis
scrollY		true	Whether or not we want scrolling on the y axis

Override global options:

import * as animateScroll from "svelte-scrollto";

animateScroll.setGlobalOptions({
	offset: 200,
	onStart: (element, offset) => {
		if(element) {
			console.log("Start scrolling to element:", element);
		} else if(offset) {
			console.log("Start scrolling to page offset: (${offset.x}, ${offset.y})");
		}
	}
})

Functions

scrollTo(options)

Accepts all global options and:

• element: The element you want scroll to
• x: The offset we want to scrolling on the x axis
• y: The offset we want to scrolling on the y axis

scrollToTop(options)

Shortcut of use scrollTo with x equal to 0.

scrollToBottom(options)

Shortcut of use scrollTo with x equal to containerHeight

Actions

Svelte action that listens for click (touchstart) events and scrolls to elements with animation.

• scrollto

• scrolltotop

• scrolltobottom

Troubleshooting

If you want to use Lazy and want to scroll to elements, you need to give your lazy components (images, v.v..) fixed dimensions, so the browser known the size of the not loaded elements before scrolling.