@castlenine/svelte-aoe

A Svelte component to animate elements, without dependencies

@castlenine/svelte-aoe utilizes the Intersection Observer API to detect when an element enters the viewport.

When the element is detected as being in the viewport, @castlenine/svelte-aoe applies a class that triggers a CSS animation.

🚀 Demo

Installation

Use your package manager to install:

npm i @castlenine/svelte-aoe --save-dev

Setup

• Import the package

import AnimateOnEnter from '@castlenine/svelte-aoe';

• Add the component to your layout/page/component.

<AnimateOnEnter />

• Add a data-aoe attribute to the element that you want to animate and define an animation.

<img data-aoe="fade-up" src="https://dummyimage.com/500x300"/>

Example: SvelteKit Global Setup

File: src/routes/+layout.svelte

<script>
  import AnimateOnEnter from '@castlenine/svelte-aoe';
</script>

<AnimateOnEnter />

<slot />

Animations

Normal speed

• up
• right
• left
• down
• fade
• fade-up
• fade-right
• fade-left
• fade-down

Fast speed

• up-fast
• right-fast
• left-fast
• down-fast
• fade-fast
• fade-up-fast
• fade-right-fast
• fade-left-fast
• fade-down-fast

Slow speed

• up-slow
• right-slow
• left-slow
• down-slow
• fade-slow
• fade-up-slow
• fade-right-slow
• fade-left-slow
• fade-down-slow

Normal speed partial fade

Start wih 0.25 opacity

• partial-fade
• partial-fade-up
• partial-fade-right
• partial-fade-left
• partial-fade-down

Fast speed partial fade

Start wih 0.25 opacity

• partial-fade-fast
• partial-fade-up-fast
• partial-fade-right-fast
• partial-fade-left-fast
• partial-fade-down-fast

Slow speed partial fade

Start wih 0.25 opacity

• partial-fade-slow
• partial-fade-up-slow
• partial-fade-right-slow
• partial-fade-left-slow
• partial-fade-down-slow

You can add your own animations by following the same pattern in your CSS.

[data-aoe='your-animation'] {
  transform: translateX(-45px);
  transition:
    transform 600ms,
    opacity 900ms;

  &.aoe {
    transform: translateX(0);
    transition-delay: 0s;
  }
}

Properties

Property name	Type	Default value
root	Document, Element, null, undefined	null
rootMargin	string in pixel (px) or percentage (%)	0px
threshold	number, number[] between 0 and 1.0	0.3

root is the element that is used as the viewport for checking visibility of the target. Must be the ancestor of the target. Defaults to the browser viewport if not specified or if null.

rootMargin is the margin around the root. Can have values similar to the CSS margin property, e.g. "10px 20px 30px 40px" (top, right, bottom, left). The values can be percentages. Defaults to '0px' (no margin).

threshold is either a single number or an array of numbers which indicate at what percentage of the target's visibility the observer's callback should be executed. A value of 0.0 or 0 indicates that even a single pixel of the target is visible. A value of 1.0 or 1 indicates that the target is completely visible. Defaults to 0.3 (30%).

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Inspired by Animate on Scroll and forked from lliamscholtz/svelte-aoe