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var ParallaxManager, ParallaxPart; | |
ParallaxPart = (function() { | |
function ParallaxPart(el) { | |
this.el = el; | |
this.speed = parseFloat(this.el.getAttribute('data-parallax-speed')); | |
this.maxScroll = parseInt(this.el.getAttribute('data-max-scroll')); | |
} | |
ParallaxPart.prototype.update = function(scrollY) { | |
if (scrollY > this.maxScroll) { return; } | |
var offset = -(scrollY * this.speed); | |
this.setYTransform(offset); | |
}; | |
ParallaxPart.prototype.setYTransform = function(val) { | |
this.el.style.webkitTransform = "translate3d(0, " + val + "px, 0)"; | |
this.el.style.MozTransform = "translate3d(0, " + val + "px, 0)"; | |
this.el.style.OTransform = "translate3d(0, " + val + "px, 0)"; | |
this.el.style.transform = "translate3d(0, " + val + "px, 0)"; | |
this.el.style.msTransform = "translateY(" + val + "px)"; | |
}; | |
return ParallaxPart; | |
})(); | |
ParallaxManager = (function() { | |
ParallaxManager.prototype.parts = []; | |
function ParallaxManager(elements) { | |
if (typeof elements === 'array' && elements.length) { | |
this.elements = elements; | |
} | |
if (typeof elements === 'object' && elements.item) { | |
this.elements = Array.prototype.slice.call(elements); | |
} else if (typeof elements === 'string') { | |
this.elements = document.querySelectorAll(elements); | |
if (this.elements.length === 0) { | |
throw new Error("Parallax: No elements found"); | |
} | |
this.elements = Array.prototype.slice.call(this.elements); | |
} else { | |
throw new Error("Parallax: Element variable is not a querySelector string, Array, or NodeList"); | |
} | |
for (var i in this.elements) { | |
this.parts.push(new ParallaxPart(this.elements[i])); | |
} | |
window.addEventListener("scroll", this.onScroll.bind(this)); | |
} | |
ParallaxManager.prototype.onScroll = function() { | |
window.requestAnimationFrame(this.scrollHandler.bind(this)); | |
}; | |
ParallaxManager.prototype.scrollHandler = function() { | |
var scrollY = Math.max(window.pageYOffset, 0); | |
for (var i in this.parts) { this.parts[i].update(scrollY); } | |
}; | |
return ParallaxManager; | |
})(); | |
new ParallaxManager('.parallax-layer'); |
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