Created
October 18, 2017 09:36
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Simple parallax
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;(function() { | |
'use strict'; | |
$.fn.parallax = function(options) { | |
var $window = $(window); | |
var defaults = { | |
'speed': 6, | |
'firstBlock': false | |
} | |
var setting = $.extend(defaults, options); | |
function initParallax() { | |
$window.on('scroll.parallax resize.parallax', { element: $(this) }, parallax); | |
// triggers window scroll for first calculate scrollTop and documentWidth | |
$window.trigger('scroll.parallax'); | |
} | |
function parallax(event) { | |
var element = event.data.element; | |
// pictures are not prepared for parallax on small resolutions | |
if (document.documentElement.clientWidth < 1024) { | |
element.css({ transform: '' }); | |
return; | |
} | |
var bgOffset = element.offset().top; | |
var scrollTop = window.pageYOffset || document.documentElement.scrollTop; | |
var yPos = (scrollTop - bgOffset) / setting['speed']; | |
if (setting['firstBlock'] === true && yPos < 0) { | |
yPos = 0; | |
} | |
element.css({ transform: 'translate3d(0px, ' + yPos + 'px, 0px)' }); | |
} | |
return this.each(initParallax); | |
} | |
$('.parallax').parallax(); | |
})(); |
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