Parallax.js
Simple, lightweight Parallax Engine that reacts to the orientation of a smart device. Where no gyroscope or motion detection hardware is available, the position of the cursor is used instead.
Check out this demo to see it in action!
Setup
Simply create a list of elements giving each item that you want to move within
your parallax scene a class of layer
and a data-depth
attribute specifying
its depth within the scene. A depth of 0 will cause the layer to remain
stationary, and a depth of 1 will cause the layer to move by the total
effect of the calculated motion. Values inbetween 0 and 1 will cause the
layer to move by an amount relative to the supplied ratio.
<ul id="scene">
<li class="layer" data-depth="0.00"><img src="layer6.png"></li>
<li class="layer" data-depth="0.20"><img src="layer5.png"></li>
<li class="layer" data-depth="0.40"><img src="layer4.png"></li>
<li class="layer" data-depth="0.60"><img src="layer3.png"></li>
<li class="layer" data-depth="0.80"><img src="layer2.png"></li>
<li class="layer" data-depth="1.00"><img src="layer1.png"></li>
</ul>
To kickoff a Parallax scene, simply select your parent DOM Element and pass it to the Parallax constructor.
var scene = document.getElementById('scene');
var parallax = new Parallax(scene);
Behaviours
There are a number of behaviours that you can setup for any given Parallax instance. These behaviours can either be specified in the markup via data attributes or in JavaScript via the constructor and API.
Behavior | Values | Description |
---|---|---|
calibrate-x |
true or false |
Specifies whether or not to cache & calculate the motion relative to the initial x axis value on initialisation. |
calibrate-y |
true or false |
Specifies whether or not to cache & calculate the motion relative to the initial y axis value on initialisation. |
invert-x |
true or false |
true moves layers in opposition to the device motion, false slides them away. |
invert-y |
true or false |
true moves layers in opposition to the device motion, false slides them away. |
limit-x |
number or false |
A numeric value limits the total range of motion in x , false allows layers to move with complete freedom. |
limit-y |
number or false |
A numeric value limits the total range of motion in y , false allows layers to move with complete freedom. |
scalar-x |
number |
Multiplies the input motion by this value, increasing or decreasing the sensitivity of the layer motion. |
scalar-y |
number |
Multiplies the input motion by this value, increasing or decreasing the sensitivity of the layer motion. |
friction-x |
number 0 - 1 |
The amount of friction the layers experience. This essentially adds some easing to the layer motion. |
friction-y |
number 0 - 1 |
The amount of friction the layers experience. This essentially adds some easing to the layer motion. |
In addition to the behaviours described above, there are two methods enable()
and disable()
that activate and deactivate the Parallax instance respectively.
Behaviors: Data Attributes Example
<ul id="scene"
data-calibrate-x="false"
data-calibrate-y="true"
data-invert-x="false"
data-invert-y="true"
data-limit-x="false"
data-limit-y="10"
data-scalar-x="2"
data-scalar-y="8"
data-friction-x="0.2"
data-friction-y="0.8">
<li class="layer" data-depth="0.00"><img src="graphics/layer6.png"></li>
<li class="layer" data-depth="0.20"><img src="graphics/layer5.png"></li>
<li class="layer" data-depth="0.40"><img src="graphics/layer4.png"></li>
<li class="layer" data-depth="0.60"><img src="graphics/layer3.png"></li>
<li class="layer" data-depth="0.80"><img src="graphics/layer2.png"></li>
<li class="layer" data-depth="1.00"><img src="graphics/layer1.png"></li>
</ul>
Behaviors: Constructor Object Example
var scene = document.getElementById('scene');
var parallax = new Parallax(scene, {
calibrateX: false,
calibrateY: true,
invertX: false,
invertY: true,
limitX: false,
limitY: 10,
scalarX: 2,
scalarY: 8,
frictionX: 0.2,
frictionY: 0.8
});
Behaviors: API Example
var scene = document.getElementById('scene');
var parallax = new Parallax(scene);
parallax.enable();
parallax.disable();
parallax.calibrate(false, true);
parallax.invert(false, true);
parallax.limit(false, 10);
parallax.scalar(2, 8);
parallax.friction(0.2, 0.8);
jQuery
If you're using jQuery or Zepto and would prefer to use Parallax.js as a plugin, you're in luck!
$('#scene').parallax();
jQuery: Passing Options
$('#scene').parallax({
calibrateX: false,
calibrateY: true,
invertX: false,
invertY: true,
limitX: false,
limitY: 10,
scalarX: 2,
scalarY: 8,
frictionX: 0.2,
frictionY: 0.8
});
jQuery: API
var $scene = $('#scene').parallax();
$scene.parallax('enable');
$scene.parallax('disable');
$scene.parallax('calibrate', false, true);
$scene.parallax('invert', false, true);
$scene.parallax('limit', false, 10);
$scene.parallax('scalar', 2, 8);
$scene.parallax('friction', 0.2, 0.8);
Build
cd build
npm install
node build.js
Author
Matthew Wagerfield: @mwagerfield
License
Licensed under MIT. Enjoy.