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漂亮的页面过渡动画

通过点击页面侧边菜单,对应的页面加载时伴随着滑动过渡动画,还带进度条效果的。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。

漂亮的页面过渡动画

查看演示 下载源码

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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