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 the demo to see it in action!

Table of Contents

1. Getting started
2. Configuration
- 2.1 Programmatic vs Declarative
- 2.2 Configuration Options
3. Methods
4. Development
5. FAQ
6. Information
- 6.1 License
- 6.2 Contributors

1. Getting started

1.1 Installation

1.1 a) Using the CDN

Add <script src="https://cdnjs.cloudflare.com/ajax/libs/parallax/3.1.0/parallax.min.js"></script> to your markup
Done!

Many thanks to the fine folks over at cdnjs for hosting our library.

1.1 b) Beginners

Head over to the releases Section
Download compiled.zip from the latest release
Extract the ZIP archive and locate the parallax.js and parallax.min.js files
- Use parallax.js if you want to snoop around in the code
- Use parallax.min.js for deployment, because it has a smaller file size
Copy the file of your choice into your project directory
So far, so good!

1.1 c) Professionals

npm i -s parallax-js

You will then find the source code in node_modules/parallax-js/src/parallax.js and the browserified, babelified, uglified, production-ready version in node_modules/parallax-js/dist/parallax.min.js

1.2 Preparations

Include the Script

If you use the compiled version, either downloaded from the releases page, or copied from the dist folder, include the script like any other Javascript library:
<script src="path/to/parallax.js"></script>

Of course, when you've installed via npm, and use browserify/babel, you can also simply do:
import Parallax from 'parallax-js' or
const Parallax = require('parallax-js')

Create your HTML elements

Each Parallax.js instance needs a container element, the scene. You're free to identify it by any means you want, but for now, let's use an ID:

<div id="scene">
</div>

Per default, all direct child elements of the scene will become moving objects, the layers. You can change this to a custom query selector, but again, we're going with the easiest approach for now:

<div id="scene">
  <div>My first Layer!</div>
  <div>My second Layer!</div>
</div>

While all other options and parameters are optional, with sane defaults, and can be set programatically, each layer needs a data-depth attribute. The movement applied to each layer will be multiplied by its depth attribute.

<div id="scene">
  <div data-depth="0.2">My first Layer!</div>
  <div data-depth="0.6">My second Layer!</div>
</div>

1.3 Run Parallax

As soon as your DOM is ready and loaded, you can create a new Parallax.js instance, providing your scene element as first parameter.

var scene = document.getElementById('scene');
var parallaxInstance = new Parallax(scene);

That's it, you're running Parallax.js now!

2. Configuration

2.1 Programmatic vs Declarative

Most configuration settings can be declared either as data-value attribute of the scene element, or property of the configuration object. The programmatic approach will take priority over the data-value attributes set in the HTML.
Some options can also be set at run-time via instance methods.

Declarative:

<div data-relative-input="true" id="scene">
  <div data-depth="0.2">My first Layer!</div>
  <div data-depth="0.6">My second Layer!</div>
</div>

Programmatic:

var scene = document.getElementById('scene');
var parallaxInstance = new Parallax(scene, {
  relativeInput: true
});

Using Methods at Runtime:

parallaxInstance.friction(0.2, 0.2);

2.2 Configuration Options

relativeInput

Property: relativeInput
Attribute: data-relative-input

Value: boolean
Default: false

Makes mouse input relative to the position of the scene element.
No effect when gyroscope is used.

clipRelativeInput

Property: clipRelativeInput
Attribute: data-clip-relative-input

Value: boolean
Default: false

Clips mouse input to the bounds of the scene. This means the movement stops as soon as the edge of the scene element is reached by the cursor.
No effect when gyroscope is used, or hoverOnly is active.

hoverOnly

Property: hoverOnly
Attribute: data-hover-only

Value: boolean
Default: false

Parallax will only be in effect while the cursor is over the scene element, otherwise all layers move back to their initial position. Works best in combination with relativeInput.
No effect when gyroscope is used.

inputElement

Property: inputElement
Attribute: data-input-element
Method: setInputElement(HTMLElement)

Value: null or HTMLElement / String
Default: null

Allows usage of a different element for cursor input.
The configuration property expects an HTMLElement, the data value attribute a query selector string.
Will only work in combination with relativeInput, setting hoverOnly might make sense too.
No effect when gyroscope is used.

calibrateX & calibrateY

Property: calibrateX & calibrateY
Attribute: data-calibrate-x & data-calibrate-y
Method: calibrate(x, y)

Value: boolean
Default: false for X, true for Y

Caches the initial X/Y axis value on initialization and calculates motion relative to this.
No effect when cursor is used.

invertX & invertY

Property: invertX & invertY
Attribute: data-invert-x & data-invert-y
Method: invert(x, y)

Value: boolean
Default: true

Inverts the movement of the layers relative to the input. Setting both of these values to false will cause the layers to move with the device motion or cursor.

limitX & limitY

Property: limitX & limitY
Attribute: data-limit-x & data-limit-y
Method: limit(x, y)

Value: false or integer
Default: false

Limits the movement of layers on the respective axis. Leaving this value at false gives complete freedom to the movement.

scalarX & scalarY

Property: scalarX & scalarY
Attribute: data-scalar-x & data-scalar-y
Method: scalar(x, y)

Value: float
Default: 10.0

Multiplies the input motion by this value, increasing or decreasing the movement speed and range.

frictionX & frictionY

Property: frictionX & frictionY
Attribute: data-friction-x & data-friction-y
Method: friction(x, y)

Value: float between 0 and 1
Default: 0.1

Amount of friction applied to the layers. At 1 the layers will instantly go to their new positions, everything below 1 adds some easing.
The default value of 0.1 adds some sensible easing. Try 0.15 or 0.075 for some difference.

originX & originY

Property: originX & originY
Attribute: data-origin-x & data-origin-y
Method: origin(x, y)

Value: float between 0 and 1
Default: 0.5

X and Y origin of the mouse input. The default of 0.5 refers to the center of the screen or element, 0 is the left (X axis) or top (Y axis) border, 1 the right or bottom.
No effect when gyroscope is used.

precision

Property: precision
Attribute: data-precision

Value: integer
Default: 1

Decimals the element positions will be rounded to. 1 is a sensible default which you should not need to change in the next few years, unless you have a very interesting and unique setup.

selector

Property: selector
Attribute: data-selector

Value: null or string
Default: null

String that will be fed to querySelectorAll on the scene element to select the layer elements. When null, will simply select all direct child elements.
Use .layer for legacy behaviour, selecting only child elements having the class name layer.

pointerEvents

Property: pointerEvents
Attribute: data-pointer-events

Value: boolean
Default: false

Set to true to enable interactions with the scene and layer elements. When set to the default of false, the CSS attribute pointer-events: none will be applied for performance reasons.
Setting this to true alone will not be enough to fully interact with all layers, since they will be overlapping. You have to either set position: absolute on all layer child elements, or keep pointerEvents at false and set pointer-events: all for the interactable elements only.

onReady

Property: onReady

Value: null or function
Default: null

Callback function that will be called as soon as the Parallax instance has finished its setup. This might currently take up to 1000ms (calibrationDelay * 2).

3. Methods

In addition to the configuration methods outlined in the section above, there are a few more publicly accessible methods:

enable()

Enables a disabled Parallax instance.

disable()

Disables a running Parallax instance.

destroy()

Completely destroys a Parallax instance, allowing it to be garbage collected.

version()

Returns the version number of the Parallax library.

4. Development

4.1 Running the Project

Clone the Repository git clone git@github.com:wagerfield/parallax.git
Open the working directory cd parallax
Install dependencies npm install
Run development server gulp watch
Open http://localhost:9000/ in browser

4.2 Opening an Issue

If you need help relating the direct usage of this library in a project of yours, provide us with a working, running example of your work. This can be a GitHub repository, a ZIP file containing your work, a project on CodePen or JSFiddle, you name it.
Do not complain about something not working without giving us some way to help you. Thank you!

4.3 Known Issues

SVG-Bug in MS Edge

It seems MS Edge does not support the children or querySelectorAll methods for SVG elements.

Animation running really slow

Depending on your site, the GPU might have a bit too much to do. You can try adding the CSS definition will-change: transform to the layer elements to speed things up. Use sparingly!

Gyroscope not working on Android

Android will only allow access to the gyroscope o secure origins (that is, with https protocol).

Gyroscope not working on iOS

Because gyroscope data had been abused to track users, it's disabled on iDevices by default and needs to be enabled by the users. You can try asking for permission via DeviceOrientationEvent.requestPermission.

Do something like:

DeviceOrientationEvent
  .requestPermission()
  .then(() => {
    new Parallax(scene)
  })

Unable to manually set position of layers

Since this often lead to issues, this library forces the positioning of the layers to be absolute. If you need to override this, add !important to your CSS positioning.

5. FAQ

How can I use this Library with jQuery?

jQuery will not prevent you from using this library in any way. If you want to use jQuery for selecting your Parallax scene element, you can do so too.

var scene = $('#scene').get(0);
var parallaxInstance = new Parallax(scene);

How can I interact with my layers?

Check out the section on the configuration option pointerEvents above.

How do I get the demo files to work?

Either download compiled_with_examples.zip from the GitHub Releases section, or follow section 4.1

6. Information

6.1 License

This project is licensed under the terms of the MIT License. Enjoy!

6.2 Authors

Matthew Wagerfield: @wagerfield
René Roth: Website

License

fcr777/parallax

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