固定背景实现的背景滚动特效示例分享_javascript技巧
程序员文章站
2022-05-20 16:47:32
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分享一个来自corpse的固定背景滚动特效,使用background-attachment: fixed和导航菜单,页面会非常平滑的滚动。
HTML
复制代码 代码如下:
CSS
复制代码 代码如下:
/* Set all parents to full height */ html, body, .container, .cbp-fbscroller, .cbp-fbscroller section { height: 100%; } /* The nav is fixed on the right side and we center it by translating it 50% (we don't know it's height so we can't use the negative margin trick) */ .cbp-fbscroller > nav { position: fixed; z-index: 9999; right: 100px; top: 50%; -webkit-transform: translateY(-50%); -moz-transform: translateY(-50%); -ms-transform: translateY(-50%); transform: translateY(-50%); } .cbp-fbscroller > nav a { display: block; position: relative; color: transparent; height: 50px; } .cbp-fbscroller > nav a:after { content: ''; position: absolute; width: 24px; height: 24px; border-radius: 50%; border: 4px solid #fff; } .cbp-fbscroller > nav a:hover:after { background: rgba(255,255,255,0.6); } .cbp-fbscroller > nav a.cbp-fbcurrent:after { background: #fff; } /* background-attachment does the trick */ .cbp-fbscroller section { position: relative; background-position: top center; background-repeat: no-repeat; background-size: cover; background-attachment: fixed; } #fbsection1 { background-image: url(../images/1.jpg); } #fbsection2 { background-image: url(../images/2.jpg); } #fbsection3 { background-image: url(../images/3.jpg); } #fbsection4 { background-image: url(../images/4.jpg); } #fbsection5 { background-image: url(../images/5.jpg); }
Javascript
复制代码 代码如下:
/** * cbpFixedScrollLayout.js v1.0.0 * http://www.codrops.com * * Licensed under the MIT license. * http://www.opensource.org/licenses/mit-license.php * * Copyright 2013, Codrops * http://www.codrops.com */ var cbpFixedScrollLayout = (function() { // cache and initialize some values var config = { // the cbp-fbscroller′s sections $sections : $( '#cbp-fbscroller > section' ), // the navigation links $navlinks : $( '#cbp-fbscroller > nav:first > a' ), // index of current link / section currentLink : 0, // the body element $body : $( 'html, body' ), // the body animation speed animspeed : 650, // the body animation easing (jquery easing) animeasing : 'easeInOutExpo' }; function init() { // click on a navigation link: the body is scrolled to the position of the respective section config.$navlinks.on( 'click', function() { scrollAnim( config.$sections.eq( $( this ).index() ).offset().top ); return false; } ); // 2 waypoints defined: // First one when we scroll down: the current navigation link gets updated. // A `new section′ is reached when it occupies more than 70% of the viewport // Second one when we scroll up: the current navigation link gets updated. // A `new section′ is reached when it occupies more than 70% of the viewport config.$sections.waypoint( function( direction ) { if( direction === 'down' ) { changeNav( $( this ) ); } }, { offset: '30%' } ).waypoint( function( direction ) { if( direction === 'up' ) { changeNav( $( this ) ); } }, { offset: '-30%' } ); // on window resize: the body is scrolled to the position of the current section $( window ).on( 'debouncedresize', function() { scrollAnim( config.$sections.eq( config.currentLink ).offset().top ); } ); } // update the current navigation link function changeNav( $section ) { config.$navlinks.eq( config.currentLink ).removeClass( 'cbp-fbcurrent' ); config.currentLink = $section.index( 'section' ); config.$navlinks.eq( config.currentLink ).addClass( 'cbp-fbcurrent' ); } // function to scroll / animate the body function scrollAnim( top ) { config.$body.stop().animate( { scrollTop : top }, config.animspeed, config.animeasing ); } return { init : init }; })();