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/** |
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* Merchant Scroll Direction. |
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* |
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*/ |
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|
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'use strict'; |
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|
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var merchant = merchant || {}; |
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merchant.scrollDirection = { |
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domReady: function domReady(fn) { |
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if (typeof fn !== 'function') { |
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return; |
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} |
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if (document.readyState === 'interactive' || document.readyState === 'complete') { |
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return fn(); |
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} |
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document.addEventListener('DOMContentLoaded', fn, false); |
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}, |
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init: function init() { |
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var elements = document.querySelectorAll('.merchant-sticky-add-to-cart-wrapper.hide-when-scroll'), |
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body = document.getElementsByTagName('body')[0]; |
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if ('null' === typeof elements) { |
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return; |
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} |
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var lastScrollTop = 0; |
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window.addEventListener('scroll', function () { |
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var scroll = window.pageYOffset || document.documentElement.scrollTop; |
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if (scroll > lastScrollTop) { |
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body.classList.remove('merchant-scrolling-up'); |
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body.classList.add('merchant-scrolling-down'); |
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} else { |
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body.classList.remove('merchant-scrolling-down'); |
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body.classList.add('merchant-scrolling-up'); |
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} |
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lastScrollTop = scroll <= 0 ? 0 : scroll; |
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}, false); |
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} |
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}; |
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|
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// Initialize. |
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merchant.scrollDirection.domReady(function () { |
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merchant.scrollDirection.init(); |
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}); |
