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parallax-background-image

v3.0.1

Published

A web component for parallax effect

Downloads

2

Vulnerabilities

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Links

Git

Maintainers

tsung-jutsung-ju

Keywords

Readme

parallax-background-image

simple, responsive parallax scrolling effect.

Features

  • works on mobile devices
  • automatically switch to pure CSS parallax effect if supported by the browser
  • zero dependencies
  • simple WebComponents-based api

Demo

https://tsung-ju.github.io/parallax-background-image/demo.html

Installation

npm install parallax-background-image
import "parallax-background-image";

Or use a CDN:

<script
  src="https://cdn.jsdelivr.net/npm/[email protected]/dist/parallax-background-image.js"
  integrity="sha384-2nB7ycUhmoVoyozfrMVHcyNV/ReqhksKj0tUyqjZd5zfZGYs3Bmv2WgpPVqIjWSp"
  crossorigin="anonymous"
></script>

Basic usage

<head>
  <style>
    #wrapper {
      position: fixed;
      height: 100%;
      width: 100%;
    }
  </style>
</head>

<body>
  <parallax-viewport id="wrapper">
    <parallax-element image-src="my-background-image1.jpg">
      ... contents
    </parallax-element>
    <div>
      <parallax-element image-src="my-background-image2.jpg">
        nesting is also supported
      </parallax-element>
    </div>
  </parallax-viewport>
</body>

For complete example see demo.html

API

<parallax-viewport>

A scrollable container block. Used to measure the scrolling position of each <parallax-element> and (when backend=3d) set parameters for perspective transform. Each <parallax-element> must be contained (directly or indirectly) in an <parallax-viewport> for this library to work.

Attributes

  • backend: Selects the method used to apply the parallax effect.
    • Supported values: 2d, 3d
    • Defaults to 3d if the browser is Blink-based, 2d otherwise.

<parallax-element>

Element with parallax scrolling effect.

Attributes

  • image-src: URL to the background image.
    • Required.
  • velocity-x velocity-y: Controls how fast the background scrolls.
    • velocity=1 means scrolling at the same speed as the parent (no parallaxing).
    • velocity=0 means the background does not move at all (fixed background).
    • Accepts floating point numbers.
    • velocity-x defaults to 1, velocity-y defaults to 0.8.
  • align-x align-y: Aligns the background to the container.
    • Accepts center, left, right, top, bottom and percentage strings (e.g. 80%).
    • align-x, align-y both defaults to center.