Jarallax

Parallax scrolling for modern browsers. Supported <img> tags, background images, YouTube, Vimeo and Self-Hosted Videos.

Online Demo

Table of Contents

• WordPress Plugin
• Quick Start
• Import Jarallax
  • ESM
  • ESM CDN
  • UMD
  • UMD CDN
  • CJS (Bundlers like Webpack)
• Prepare HTML
• Run Jarallax
  • A. JavaScript way
  • B. Data attribute way
  • C. jQuery way
• Background Video Usage Examples
  • A. JavaScript way
  • B. Data attribute way
• Options
  • Disable on mobile devices
  • Additional options for video extension
• Events
  • Additional events for video extension
  • onScroll event
• Methods
  • Call methods example
    • A. JavaScript way
    • B. jQuery way
• For Developers
• Real Usage Examples
• Credits

WordPress Plugin

We made WordPress plugin to easily add backgrounds for content in your blog with all Jarallax features.

Demo: https://wpbackgrounds.com/

Download: https://wordpress.org/plugins/advanced-backgrounds/

Quick Start

There are a set of examples, which you can use as a starting point with Jarallax.

• ES Modules
• JavaScript
• Next.js
• Next.js Advanced Usage
• HTML
• jQuery

Import Jarallax

Use one of the following examples to import jarallax.

ESM

We provide a version of Jarallax built as ESM (jarallax.esm.js and jarallax.esm.min.js) which allows you to use Jarallax as a module in your browser, if your targeted browsers support it.

<!-- Jarallax CSS -->
<link href="jarallax.min.css" rel="stylesheet">

<!-- Jarallax JS -->
<script type="module">
  import { jarallax, jarallaxVideo } from "jarallax.esm.min.js";

  // Optional video extension
  jarallaxVideo();
</script>

ESM CDN

<!-- Jarallax CSS -->
<link href="https://cdn.jsdelivr.net/npm/jarallax@2/dist/jarallax.min.css" rel="stylesheet">

<!-- Jarallax JS -->
<script type="module">
  import { jarallax, jarallaxVideo } from "https://cdn.jsdelivr.net/npm/jarallax@2/+esm";

  // Optional video extension
  jarallaxVideo();
</script>

UMD

Jarallax may be also used in a traditional way by including script in HTML and using library by accessing window.jarallax.

<!-- Jarallax CSS -->
<link href="jarallax.min.css" rel="stylesheet">

<!-- Jarallax JS -->
<script src="jarallax.min.js"></script>

<!-- Jarallax JS: Optional video extension -->
<script src="jarallax-video.min.js"></script>

UMD CDN

<!-- Jarallax CSS -->
<link href="https://cdn.jsdelivr.net/npm/jarallax@2/dist/jarallax.min.css" rel="stylesheet">

<!-- Jarallax JS -->
<script src="https://cdn.jsdelivr.net/npm/jarallax@2/dist/jarallax.min.js"></script>

<!-- Jarallax JS: Optional video extension -->
<script src="https://cdn.jsdelivr.net/npm/jarallax@2/dist/jarallax-video.min.js"></script>

CJS (Bundlers like Webpack)

Install Jarallax as a Node.js module using npm

npm install jarallax

Import Jarallax by adding this line to your app's entry point (usually index.js or app.js):

import { jarallax, jarallaxVideo } from "jarallax";
import 'jarallax/dist/jarallax.min.css';

// Optional video extension
jarallaxVideo();

Prepare HTML

<!-- Background Image Parallax -->
<div class="jarallax">
  <img class="jarallax-img" src="<background_image_url_here>" alt="">
  Your content here...
</div>

<!-- Background Image Parallax with <picture> tag -->
<div class="jarallax">
  <picture class="jarallax-img">
    <source media="..." srcset="<alternative_background_image_url_here>">
    <img src="<background_image_url_here>" alt="">
  </picture>
  Your content here...
</div>

<!-- Alternate: Background Image Parallax -->
<div class="jarallax" style="background-image: url('<background_image_url_here>');">
  Your content here...
</div>

Run Jarallax

Note: automatic data-attribute initialization and jQuery integration are available in UMD mode only.

A. JavaScript way

jarallax(document.querySelectorAll('.jarallax'), {
  speed: 0.2,
});

B. Data attribute way

<div data-jarallax data-speed="0.2" class="jarallax">
  <img class="jarallax-img" src="<background_image_url_here>" alt="">
  Your content here...
</div>

Note: You can use all available options as data attributes. For example: data-speed, data-img-src, data-img-size, etc...

C. jQuery way

$('.jarallax').jarallax({
  speed: 0.2,
});

No conflict (only if you use jQuery)

Sometimes to prevent existing namespace collisions you may call .noConflict on the script to revert the value of.

const jarallaxPlugin = $.fn.jarallax.noConflict() // return $.fn.jarallax to previously assigned value
$.fn.newJarallax = jarallaxPlugin // give $().newJarallax the Jarallax functionality

Background Video Usage Examples

A. JavaScript way

import { jarallax, jarallaxVideo } from 'jarallax';
jarallaxVideo();

jarallax(document.querySelectorAll('.jarallax'), {
  speed: 0.2,
  videoSrc: 'https://www.youtube.com/watch?v=ab0TSkLe-E0'
});

<div class="jarallax"></div>

B. Data attribute way

<!-- Background YouTube Parallax -->
<div class="jarallax" data-jarallax data-video-src="https://www.youtube.com/watch?v=ab0TSkLe-E0">
  Your content here...
</div>

<!-- Background Vimeo Parallax -->
<div class="jarallax" data-jarallax data-video-src="https://vimeo.com/110138539">
  Your content here...
</div>

<!-- Background Self-Hosted Video Parallax -->
<div class="jarallax" data-jarallax data-video-src="mp4:./video/local-video.mp4,webm:./video/local-video.webm,ogv:./video/local-video.ogv">
  Your content here...
</div>

Note: self-hosted videos require 1 video type only, not necessarily using all mp4, webm, and ogv. This is only needed for maximum compatibility with all browsers.

Options

Options can be passed in data attributes or in object when you initialize jarallax from script.

Name | Type | Default | Description :--- | :--- | :------ | :---------- type | string | scroll | scroll, scale, opacity, scroll-opacity, scale-opacity. speed | float | 0.5 | Parallax effect speed. Provide numbers from -1.0 to 2.0. containerClass | string | jarallax-container | Container block class attribute. imgSrc | path | null | Image url. By default used image from background. imgElement | dom / selector | .jarallax-img | Image tag that will be used as background. imgSize | string | cover | Image size. If you use <img> tag for background, you should add object-fit values, else use background-size values. imgPosition | string | 50% 50% | Image position. If you use <img> tag for background, you should add object-position values, else use background-position values. imgRepeat | string | no-repeat | Image repeat. Supported only background-position values. keepImg | boolean | false | Keep <img> tag in it's default place after Jarallax inited. elementInViewport | dom | null | Use custom DOM / jQuery element to check if parallax block in viewport. More info here - Issue 13. zIndex | number | -100 | z-index of parallax container. disableParallax | RegExp / function | - | Disable parallax on specific user agents (using regular expression) or with function return value. The image will be set on the background.

Disable on mobile devices

You can disable parallax effect and/or video background on mobile devices using option disableParallax and/or disableVideo.

Example:

jarallax(document.querySelectorAll('.jarallax'), {
  disableParallax: /iPad|iPhone|iPod|Android/,
  disableVideo: /iPad|iPhone|iPod|Android/
});

Or using function. Example:

jarallax(document.querySelectorAll('.jarallax'), {
  disableParallax: function () {
    return /iPad|iPhone|iPod|Android/.test(navigator.userAgent);
  },
  disableVideo: function () {
    return /iPad|iPhone|iPod|Android/.test(navigator.userAgent);
  }
});

Additional options for video extension

Required jarallax/jarallax-video.js file.

Name | Type | Default | Description :--- | :--- | :------ | :---------- videoClass | string | jarallax-video | Video frame class attribute. Will also contain the type of the video, for example jarallax-video jarallax-video-youtube videoSrc | string | null | You can use Youtube, Vimeo or Self-Hosted videos. Also you can use data attribute data-jarallax-video. videoStartTime | float | 0 | Start time in seconds when video will be started (this value will be applied also after loop). videoEndTime | float | 0 | End time in seconds when video will be ended. videoLoop | boolean | true | Loop video to play infinitely. videoPlayOnlyVisible | boolean | true | Play video only when it is visible on the screen. videoLazyLoading | boolean | true | Preload videos only when it is visible on the screen. disableVideo | RegExp / function | - | Disable video load on specific user agents (using regular expression) or with function return value. The image will be set on the background.

Events

Events used the same way as Options.

Name | Description :--- | :---------- onScroll | Called when parallax working. Use first argument with calculations. More info see below. onInit | Called after init end. onDestroy | Called after destroy. onCoverImage | Called after cover image.

Additional events for video extension

Required jarallax/jarallax-video.js file.

Name | Description :--- | :---------- onVideoInsert | Called right after video is inserted in the parallax block. Video can be accessed by this.$video onVideoWorkerInit | Called after VideoWorker script initialized. Available parameter with videoWorkerObject.

onScroll event

jarallax(document.querySelectorAll('.jarallax'), {
  onScroll: function(calculations) {
    console.log(calculations);
  }
});

Console Result:

{
  // parallax section client rect (top, left, width, height)
  rect            : object,

  // see image below for more info
  beforeTop       : float,
  beforeTopEnd    : float,
  afterTop        : float,
  beforeBottom    : float,
  beforeBottomEnd : float,
  afterBottom     : float,

  // percent of visible part of section (from 0 to 1)
  visiblePercent  : float,

  // percent of block position relative to center of viewport from -1 to 1
  fromViewportCenter: float
}

Calculations example:

Methods

Name | Result | Description :--- | :----- | :---------- destroy | - | Destroy Jarallax and set block as it was before plugin init. isVisible | boolean | Check if parallax block is in viewport. onResize | - | Fit image and clip parallax container. Called on window resize and load. onScroll | - | Calculate parallax image position. Called on window scroll.

Call methods example

A. JavaScript way

jarallax(document.querySelectorAll('.jarallax'), 'destroy');

B. jQuery way

$('.jarallax').jarallax('destroy');

For Developers

Installation

• Run npm install in the command line

Building

• npm run dev to run build and start local server with files watcher
• npm run build to run build

Linting

• npm run js-lint to show eslint errors
• npm run js-lint-fix to automatically fix some of the eslint errors

Test

• npm run test to run unit tests

Real Usage Examples

• AWB
• Godlike
• Youplay
• Skylith
• Khaki

Credits

• Images https://unsplash.com/
• Videos https://videos.pexels.com/