A tiny (5KB) vanilla JS script to trigger animations on elements when they are within the viewport πŸ‘“
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README.md

Animate.js Build Status

Trigger animations on elements when they are in view πŸ‘“.

Demo


Interested in writing your own JavaScript plugins? Check out ES6.io for great tutorials!


Setup

<script src="/assets/js/dist/animate.js"></script>
<script>
    var animate = new Animate({        
        target: '[data-animate]',
        animatedClass: 'js-animated',
        offset: [0.5, 0.5],
        delay: 0,
        remove: true,
        scrolled: false,
        reverse: false,
        onLoad: true,
        onScroll: true,
        onResize: false,
        disableFilter: false,
        callbackOnInit: function() {},
        callbackOnInView: function(el) {},
        callbackOnAnimate: function(el) {},
    });
    animate.init();
</script>

Installation

To install via NPM, run npm install --save-dev animate.js

Options

target

Type: String Default: [data-animate]

Element(s) reference to target (querySelectorAll is called against this value). Once this element is in view, add animations.

animatedClass

Type: String Default: js-animated

Class to be added to element once animation has completed.

offset

Type: Array/Number Default: [0.5, 0.5]

The vertical and horizontal percentages of the element that needs to be in the viewport before the animation triggers. If a single number is passed instead of an array, that number will be used for both the vertical and horizontally offset.

Examples

// Trigger animations when 50% of an elements height 
// is within the viewport and 100% of its width:
var animate = new Animate({
    target: '[data-animate]',
    animatedClass: 'visible',
    offset: [0.5, 1],
});

// Trigger animations when 100% of an elements height 
// is within the viewport and 25% of its width:
var animate = new Animate({
    target: '[data-animate]',
    animatedClass: 'visible',
    offset: [1, 0.25],
});

// Trigger animations when 50% of an elements height 
// is within the viewport and 50% of its width:
var animate = new Animate({
    target: '[data-animate]',
    animatedClass: 'visible',
    offset: 0.5,
});

delay

Type: Number Default: 0

Milisecond delay before animation is added to element in view.

remove

Type: Boolean Default: true

Whether animation classes should removed when the animations complete.

reverse

Type: Boolean Default: false

Once the element has left the top of the viewport (by the same offset), remove the animations from element. When the element comes back into view, it will animate again.

scrolled

Type: Boolean Default: false

Animate any elements that a user has already scrolled past on load. This will only trigger if the onLoad option (see below) is true.

onLoad

Type: Boolean Default: true

Whether to fire on DOMContentLoaded.

onScroll

Type: Boolean Default: true

Whether to fire on scroll.

onResize

Type: Boolean Default: false

Whether to fire on resize.

disableFilter

Type: Function Default: null

Function to determine whether Animate should animate elements.

Example

// Function to determine whether we are on a mobile device
var isMobile = function() {
    if (window.matchMedia("(max-width: 480px)").matches) {
        return true;
    } else {
        return false;
    }
};

// Disable Animate.js if isMobile returns true
var animate = new Animate({
    onResize: true,
    disableFilter: isMobile,
});

callbackOnInit

Type: Function Default: function(){}

Function to run once Animate.js initialises

callbackOnInView

Type: Function Default: function(el){}

Function to run once the element is in the viewport (pass parameter to access the element).

callbackOnAnimate

Type: Function Default: function(el){}

Function to run once animation has completed (pass parameter to access the animated element).

Element overrides

data-animate

Default way of targeting an element to animate (no value required). This can be overridden to be a custom attribute or class.

data-animation-classes

Animations to be added to element when it is in view. To add multiple classes, seperate each class with a space (as you would normally).

Optional element overrides

data-animation-delay

Overide the plugin delay option per element.

data-animation-offset

Override the plugin offset option per element.

data-animation-remove

Overide the plugin removeAnimations option per element.

data-animation-reverse

Overide the plugin reverse option per element.

Examples

<div data-animate data-animation-classes="animated fadeIn"></div>
<div data-animate data-animation-classes="animated tada" data-animation-delay="1000"></div>
<div data-animate data-animation-classes="animated bounce" data-animation-offset="0.2, 0.5"></div>
<div data-animate data-animation-classes="animated bounce" data-animation-remove="true"></div>

Methods

init();

Initialises event listeners.

kill();

Kills event listeners and resets options.

render();

Adds/removes animations without the need for event listeners.

Browser compatibility

Animate.js is supported in modern browsers from IE9 and above (i.e. browsers that support CSS animations). Due to discrepencies in support for Element.classList, I would recommend including the very good classList polyfill before you include animate.js. I would also suggest using Modernizr to feature detect CSS animations/transitions and apply override styling for browsers that do not support those features.

Using SCSS, this may look like this:

.animate {
    opacity: 0;
    .no-csstransitions &, .no-cssanimations &  {
        opacity: 1;
    }
}

Development

To setup a local environment: clone this repo, navigate into it's directory in a terminal window and run the following command:

  • npm install

Gulp tasks

  • gulp dev
  • gulp test
  • gulp build

Contributions

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Gulp...bla bla bla

License

MIT License