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基于javascript实现漂亮的页面过渡动画效果附源码下载

2019-11-20 11:24:08
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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 class="cd-side-navigation">   <ul>     <li>       <a href="index.html" class="selected" data-menu="index">         <svg><!-- svg content here --></svg>         Intro       </a>     </li>     <li>       <!-- ... -->     </li>     <!-- other list items here -->   </ul> </nav> <!-- .cd-dashboard --> <main class="cd-main">   <section class="cd-section index visible">     <header>       <div class="cd-title">         <h2>Animated Page Transition #2</h2>         <span>Some text here</span>       </div>       <a href="#index-content" class="cd-scroll">Scroll Down</a>     </header>     <div class="cd-content" id="index-content">       <!-- content here -->     </div> <!-- .cd-content -->   </section> <!-- .cd-section --> </main> <!-- .cd-main --> <div id="cd-loading-bar" data-scale="1" class="index"></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 class="cd-section overflow-hidden '+newSection+'"></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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