Elemations

Typescript HTML Element Animations

Custom Development by Stateless Studio

Installation

npm i elemations

How It Works

When a trigger element is scrolled into view, the selector elements will get a new class. The CSS transition will animate between the two states.

Usage

1. Create an HTML element to animate
2. Create a CSS rule for the default (before animation) state
3. Add a transition to the CSS of the element to set how the animation should look
4. Create a CSS rule for the after-animation state
5. In your TypeScript class, create a new Elemation()

View the examples below and this will all make some sense.

Examples

Fade In

index.html

...
<div class="fade-container">
	<div class="fade">Faded</div>
</div>
...

index.css

.fade {
	opacity: 0; /* Start the element faded out completely */
	transition: opacity 2s; /* Animate the fade over a two seconds */
}

.fade.scrolled-to {
	opacity: 1; /* The animation will finish with the element visible */
}

index.ts

onLoad() {
	const elemation = new Elemation(
		'.fade-container', // Trigger the animation when this element is visible
		'.fade' // Animate the `.fade` element
	);
}

Slide from right-hand

index.html

...
<div class="woo-container">
	<div class="woo">WOOOO!</div>
</div>
...

index.css

.woo {
	position: relative; /* Needed for all movement animations */
	left: 100vw; /* Start the element off the screen (to the right) */
	transition: left 0.5s; /* Animate the left movement over a half-second */
}

.woo.scrolled-to {
	left: 0; /* The animation will end with the element back in position */
}

index.ts

onLoad() {
	const elemation = new Elemation(
		'.woo-container', // Trigger the animation when this element is visible
		'.woo' // Animate the `.woo` element
	);
}

Fade in & Slide from bottom-right

index.html

...
<div class="woo-fade-container">
	<div class="woo-fade">WOOOO! Fade!</div>
</div>
...

index.css

.woo-fade {
	position: relative; /* Needed for all movement animations */
	left: 100vw; /* Start the element off the screen (to the right) */
	top: 100vh; /* Start the element off the screen (to the bottom) */
	opacity: 0; /* Start the element faded out completely */
	transition: all 0.5s; /* Animate all properties over a half-second */
}

.woo-fade.scrolled-to {
	left: 0; /* The animation will end with the element back in position */
	top: 0;
	opacity: 1; /* And with completely faded in */
}

index.ts

onLoad() {
	const elemation = new Elemation(
		'.woo-fade-container', // Trigger the animation when this element is visible
		'.woo-fade' // Animate the `.woo-fade` element
	);
}

Multiple objects per animation

index.html

...
<div class="multi-container">
	<div class="multi-obj">Object 1</div>
	<div class="multi-obj">Object 2</div>
	<div class="multi-obj">Object 3</div>
</div>
...

index.css

.multi-obj {
	position: relative; /* Needed for all movement animations */
	top: -100vw; /* Start the element off the screen (to the top) */
	transition: top 0.5s; /* Animate top position over a half-second */
}

.multi-obj.scrolled-to {
	top: 0; /* The animation will end with each element back in position */
}

index.ts

onLoad() {
	const elemation = new Elemation(
		'.multi-container', // Trigger the animation when this element is visible
		'.multi-obj', // Animate each `.multi-obj` element
		500 // Start each element 500ms after the previous one
	);
}

Don't Forget

1. To create CSS for both states, default and .scrolled-to
2. Add the transition property, otherwise the state-change will be instant and unanimated
3. Add the position: relative property for any animations that slide/move the elements
4. Add overflow property to the body/parent to hide elements which should be out-of-view.

e.g.

html,
body {
	overflow-x: hidden; /* This will hide the element while it's off the screen */
}

.woo {
	position: relative;
	left: 100vw;
	transition: left 0.5s;
}

.woo.scrolled-to {
	left: 0;
}
...

Using Angular?

If you're using Angular, create your Elemation in ngOnInt().

You'll also have to use a setTimeout() to set the elemations after page-load:

export class CoolComponent implements OnInit {
	ngOnInit() {
		setTimeout(() => {
			const elemation = new Elemation(...);
		});
	}
}

If you're using Angular Universal (Server-Side Rendering), you'll also need to check that the platform is browser before calling the setTimeout. For help on this, see https://stackoverflow.com/questions/46099644/how-to-check-for-isbrowser-in-angular-4

Advanced Setup

If you'd like to get more control, you can use a more advanced setup:

const elemation = new Elemation(); // Don't pass any arguments to constructor
elemation.selectors = '.woo'; // Animate the `.woo` element
elemation.setEndstops('.woo-container'); // Set the scroll trigger container
elemation.ready(); // Start listening for scroll trigger

Manual Trigger

You can also trigger the animation programmatically (e.g. at the click of a button):

Note: Don't call ready() on the elemation if you don't want to use the scroll trigger.

elemation.start(); // Programatically start the animation

Custom Trigger Location

Or set a manual trigger location (pixels from top):

elemation.splitLocation = 1500; // Trigger at 1500 pixels of scroll
elemation.ready();

Custom Trigger

You can override the trigger to be based off anything. When the trigger method returns true, the animation will start. The trigger is assessed on page load and every time the window is scrolled, until it fires.

For example, we can start the animation when a random number is 0.5:

elemation.trigger = function() {
	return Math.random() === 0.5;
};
elemation.ready();

or when the year is 3000:

elemation.trigger = function() {
	return Date.now() >= 32503680000; // Epoch time for Jan 1st, 3000
};
elemation.ready();

Once the trigger fires, the elemation will automatically unregister it's listener.