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August 2, 2016 12:55
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back-to-top block
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| 'use strict'; | |
| (function ($) { | |
| var $body, | |
| $window, | |
| backToTop = { | |
| init: function () { | |
| this.$backToTop = $('#back-top'); | |
| this.$header = $('#header'); | |
| this.$footer = $('#footer'); | |
| if (this.$backToTop.length) { | |
| this.bindEvents(); | |
| } | |
| }, | |
| bindEvents: function () { | |
| if (window.addEventListener) { | |
| window.addEventListener('scroll', this.handlerScroll.bind(this), false); | |
| window.addEventListener('resize', this.handlerResizer.bind(this), false); | |
| } else if (window.attachEvent) { | |
| window.attachEvent('onscroll', this.handlerScroll.bind(this)); | |
| window.attachEvent('onresize', this.handlerResizer.bind(this)); | |
| } | |
| $window.on('touchmove', this.handlerScroll.bind(this)); | |
| this.$backToTop.on('click', this.handlerClick.bind(this)); | |
| }, | |
| handlerClick: function(ev) { | |
| ev.preventDefault(); | |
| $('html, body').animate({ | |
| scrollTop: 0 | |
| }, 500); | |
| }, | |
| handlerResizer: function () { | |
| setTimeout(this.handlerScroll.bind(this), 500); | |
| }, | |
| handlerScroll: function () { | |
| var scrollTop = $window.scrollTop(), | |
| navTop = 100, | |
| footerTop = this.$footer.offset().top, | |
| windowHeight = $window.height(), | |
| b = 10; | |
| this.$backToTop.toggleClass('_active', (scrollTop > navTop)); | |
| if (scrollTop + windowHeight > footerTop) { | |
| b += windowHeight + scrollTop - footerTop; | |
| } | |
| this.$backToTop.css('bottom', b); | |
| } | |
| }; | |
| $(function () { | |
| $body = $('body'); | |
| $window = $(window); | |
| backToTop.init(); | |
| }); | |
| })(window.$j); |
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| .back-top { | |
| position: fixed; | |
| bottom: 10px; | |
| right: 10px; | |
| z-index: 9; | |
| width: 4rem; | |
| height: 4rem; | |
| color: #ffffff; | |
| line-height: 4rem; | |
| background-color: #222; | |
| text-decoration: none; | |
| text-align: center; | |
| transition: opacity .2s ease-out; | |
| opacity: 0; | |
| &._active { | |
| opacity: 1; | |
| } | |
| &:hover, | |
| &:active, | |
| &:focus, | |
| &:visited { | |
| color: #ffffff; | |
| text-decoration: none; | |
| } | |
| } |
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| <header id="header" class="header"> | |
| <div class="container"></div> | |
| </header> | |
| <section id="main" class="main"> | |
| <a href="#" id="back-top" class="back-top">▲</a> | |
| </section> | |
| <footer id="footer" class="footer"> | |
| <div class="container"></div> | |
| </footer> |
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