JS --- package getScroll function & Case: fixed navigation

Package function getScroll

1. Obtain the value of the page curl up or left out distance

2. Scroll event browser

  function getScroll() {
    return {
      left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft||0,
      top: window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0
    };
  }

    // scroll event browser 
    window.onscroll = function () {
      console.log(getScroll().top);
    };

Case: Fixed navigation

After obtaining a height greater than the high value determination scrollTop navigation bar, fixed pattern is set, while, the value marginTop home portion, to prevent the floating / off marked influence caused by setting this value to the navigation high

<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    * {
      margin: 0;
      padding: 0
    }

    img {
      vertical-align: top;
    }

    .main {
      margin: 0 auto;
      width: 1000px;
      margin-top: 10px;

    }

    .fixed {
      position: fixed;
      top: 0;
      left: 0;
    }
  </style>
</head>

<body>
  <div class="top" id="topPart">
    <img src="images/top.png" alt="" />
  </div>
  <div class="nav" id="navBar">
    <img src="images/nav.png" alt="" />
  </div>
  <div class="main" id="mainPart">
    <img src="images/main.png" alt="" />
  </div>
  <script src="common.js"></script>
  <script>

    // Get the value of the left page curl up or out the distance 
    function getScroll () {
       return {
        left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0,
        top: window.pageXOffset || document.documentElement.scrollTop || document.body.scrollTop || 0
      };
    }

    // slip event 
    window.onscroll =  function () {
       IF (getScroll (). Top > = My $ ( " topPart " ) .offsetHeight) {
         // set the second div class style 
        My $ ( " NavBar " ). className =  " NAV Fixed " ;
         // set the value of the third mainTop the div 
        My $ ( " mainPart " ) .style.marginTop = My $ ( " NavBar " ) .offsetHeight +  " PX " ;
      } else {
        my$("navBar").className = "nav";
        my$("mainPart").style.marginTop = "10px";
      }
    };
  </script>

</body>

</html>

JS --- package getScroll function & Case: fixed navigation

Package function getScroll

Case: Fixed navigation

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