Parallax ImageScroll - jQuery plugin
JQuery and amd compatible plugin to create a parallax effect with images. Heavily inspired by the spotify.com website.
The plugin is really simple to use with some options to tweek. It makes use of css3 transform for animation where supported and falls back to top and left positioning for ancient browsers.
Check out the live demo. (No parallax effect and smaller image sizes for touch devices, see Touch section for details.)
Markup
Markup can consist of as many image elements as you want, but you should separate them with a content block, e.g. a section.
<div class="img-holder" data-image="anImage.jpg"></div>
<section><p>Content that "slides" on top of the images</p></section>
<div class="img-holder" data-image="anotherImage.jpg">[optional content to be displayed on top of the images]</div>
You can set parameters using html5 data attributes or with javascript, see options section for details.
Initialization
To initialize the plugin, call the imageScroll method on your image elements
$('.img-holder').imageScroll();
AMD
The plugin is AMD compatible. To use with e.g. RequireJS, you can do this. See demo files for example.
require(['jquery.imageScroll'], function (ImageScroll) {
$('.img-holder').each(function () {
new ImageScroll(this);
});
//or
//$('.img-holder').imageScroll();
});
Options
You can configure the default options, by passing an option object to the plugin
$('.img-holder').imageScroll({
coverRatio: 0.5
});
or set the options via data attributes, data-optionname (available options: image, width (mediaWidth), height (mediaHeight), cover-ratio (coverRatio), min-height (holderMinHeight), max-height (holderMaxHeight), extra-height (extraHeight)
<div class="img-holder" data-image="anImage.jpg" data-cover-ratio="0.5"></div>
or set the options globally
$.fn.imageScroll.defaults.coverRatio = 0.5;
//AMD
ImageScroll.defaults.coverRatio = 0.5;
Configurable options:
image: null
: The image to show (best to set this option via data attr (data-img)imageAttribute: 'image'
: The data attribute name for images. Uses the value of this attribute to load the imagecontainer: $('body')
The element to which the parallax image(s) will be attached towindowObject: $(window)
The window object which listens to scroll and resize eventsspeed: 0.2
The speed of the parallax effect. A floating number between 0 and 1, where a higher number will move the images faster upwardscoverRatio: 0.75 //75%
How many percent of the screen each image should coverholderClass: 'imageHolder'
Class added to the image holder(s)imgClass: 'img-holder-img'
Class added to the imageholderMinHeight: 200
The minimum height of the image in pixelsholderMaxHeight: null
The maximum height of the image in pixelsextraHeight: 0
Extra height added to the image. Can be useful if you want to show more of the top imagemediaWidth: 1600
The original width of the imagemediaHeight: 900
The original height of the imageparallax: true
Whether or not you want the parallax effect, e.g. does not work very well in ancient browserstouch: false
Presents a mobile/tablet friendy version, no parallax effect and smaller images (should be used with a mobile/tablet optimized images)
Public methods:
disable()
enable()
refresh()
destroy()
You can call them on individual- or all the instances.
//Call method refresh on all the instances of the plugin
var instances = $('.img-holder');
instances.imageScroll('refresh');
//E.g. Call method refresh on the first image
//Alternative 1:
var instances = $('.img-holder');
var instance = $(instances.get(0));
instance.imageScroll('refresh');
//Alternative 2:
var instances = $('.img-holder');
var instance = $(instances.get(0)).data('plugin_imageScroll');
instance.refresh();
Touch
The effect is not very smooth on a touch device. You could therefore present the user with a fallback version, which displays the images with no parallax effect. You can do so by checking for touch (e.g. with Modernizr, external lib) and set dynamic options to adjust to this.
var touch = Modernizr.touch;
$('.img-holder').imageScroll({
imageAttribute: (touch === true) ? 'image-mobile' : 'image',
touch: touch
});
Installation
Install using bower
bower install Parallax-ImageScroll
Requirements
jQuery version 1.8.0 or higher
Notes
If you add content on top of the parallaxed image, make sure to apply a higher z-depth for the content (applies for browsers that support 3d transforms). Example:
<div class="img-holder" data-image="anotherImage.jpg"><p style="-webkit-transform: translateZ(1px)">Hello world!</p></div>
Limitations
Does not work very well on mobile or IE <= 9. You can then present a fallback solution by disabling parallax for ancient desktop browser (set parallax option to false) and present touch optimized images for touch devices (set touch option to true).
MIT
MIT licensed