用户通过点击页面左侧的菜单,对应的页面加载时伴随着滑动过滤动画,并带有进度条效果。当然页面的加载是Ajax驱动的,整个加载过渡过程非常流畅,非常好的用户体验。
HTML
HTML结构中,.cd-main包含页面主体内容,.cd-side-navigation包含着侧边导航条,#cd-loading-bar则是用来做进度条动画用的。
<nav> <ul> <li> <a href="https://www.jb51.net/index.html" data-menu="index"> <svg><!-- svg content here --></svg> Intro </a> </li> <li> <!-- ... --> </li> <!-- other list items here --> </ul> </nav> <!-- .cd-dashboard --> <main> <section> <header> <div> <h2>Animated Page Transition #2</h2> <span>Some text here</span> </div> <a href="#index-content">Scroll Down</a> </header> <div> <!-- content here --> </div> <!-- .cd-content --> </section> <!-- .cd-section --> </main> <!-- .cd-main --> <div data-scale="1"></div> <!-- lateral loading bar -->
CSS
我们将.cd-side-navigation固定在页面左侧,并且设置它的高度为100%,这样左侧导航菜单就始终占据左侧边栏,右侧主体内容滚动时,左侧导航菜单不动。
.cd-side-navigation { position: fixed; z-index: 3; top: 0; left: 0; height: 100vh; width: 94px; overflow: hidden; } .cd-side-navigation ul { height: 100%; overflow-y: auto; } .cd-side-navigation::before { /* background color of the side navigation */ content: ''; position: absolute; top: 0; left: 0; height: 100%; width: calc(100% - 4px); background-color: #131519; } .cd-side-navigation li { width: calc(100% - 4px); } .cd-side-navigation a { display: block; position: relative; } .cd-side-navigation a::after { /* 4px line to the right of the item - visible on hover */ content: ''; position: absolute; top: 0; right: -4px; height: 100%; width: 4px; background-color: #83b0b9; opacity: 0; } .no-touch .cd-side-navigation a:hover::after { opacity: 1; }
JavaScript
当我们点击左侧菜单时,调用triggerAnimation()函数,这个函数会触发加载进度条动画函数loadingBarAnimation(),接着加载页面内容函数:loadNewContent()。
function loadingBarAnimation() { var scaleMax = loadingBar.data('scale'); if( scaleY + 1 < scaleMax) { newScaleValue = scaleY + 1; } // ... loadingBar.velocity({ scaleY: newScaleValue }, 100, loadingBarAnimation); }
当新页面被选中时,一个新的元素.cd-section将会被创建并且插入到DOM中,然后load()新的url内容。
function loadNewContent(newSection) { var section = $('<section></section>').appendTo(mainContent); //load the new content from the proper html file section.load(newSection+'.html .cd-section > *', function(event){ loadingBar.velocity({ scaleY: scaleMax //this is the scaleY value to cover the entire window height (100% loaded) }, 400, function(){ section.addClass('visible'); var url = newSection+'.html'; if(url!=window.location){ //add the new page to the window.history window.history.pushState({path: url},'',url); } // ... }); }); }
通过异步加载的页面要返回上一页历史浏览记录的话,可以点击浏览器上的返回即可。返回上一页同样有过渡动画效果。
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