Realize beautiful page transition animation effect based on javascript with source code download_javascript skills

By clicking the menu on the left side of the page, the corresponding page will be loaded with a sliding filter animation and a progress bar effect. Of course, the loading of the page is Ajax-driven, and the entire loading transition process is very smooth and provides a very good user experience.

HTML

In the HTML structure, .cd-main contains the main content of the page, .cd-side-navigation contains the side navigation bar, and #cd-loading-bar is used for progress bar animation.

<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 id="Animated-Page-Transition">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

We fixed .cd-side-navigation on the left side of the page and set its height to 100%, so that the left navigation menu always occupies the left sidebar. When the main content on the right is scrolled, the left navigation menu does not move.

.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

When we click on the left menu, the triggerAnimation() function is called. This function will trigger the loading progress bar animation function loadingBarAnimation(), and then load the page content function: loadNewContent().

function loadingBarAnimation() { 
  var scaleMax = loadingBar.data('scale'); 
  if( scaleY + 1 < scaleMax) { 
    newScaleValue = scaleY + 1; 
  } 
  // ... 
   
  loadingBar.velocity({ 
    scaleY: newScaleValue 
  }, 100, loadingBarAnimation); 
}

When a new page is selected, a new element .cd-section will be created and inserted into the DOM, and then load() the new url content.

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); 
      } 
 
      // ... 
    }); 
  }); 
}

If you want to return to the previous page's browsing history through a page loaded asynchronously, you can click Return on the browser. Returning to the previous page also has a transition animation effect.