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Detailed explanation of examples of javaScript scroll bar events

黄舟Original: 2017-09-28 10:44:261505browse

This article mainly introduces the relevant information of javaScript to implement scroll bar events in detail. It has certain reference value. Interested friends can refer to it.

The examples in this article share the js implementation with everyone. The specific code of the scroll bar event is for your reference. The specific content is as follows

Code:

<html>

 <head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
  <title></title>

  <style>
   body {
    margin: 0;
    padding: 0;
   }

   .cont {
    height: 7000px;
   }

   #top {
    position: fixed;
    width: 100%;
    height: 55px;
    top: 0px;
    left: 0px;
    background-color: rosybrown;
    display: none;
   }

   #left {
    position: fixed;
    width: 50px;
    height: 400px;
    top: 150px;
    left: 50px;
    background-color: cadetblue;
    display: none;
   }

   #left ul {
    list-style: none;
    padding-left: 0px;
   }

   #left ul li {
    border: 1px solid white;
    /*color: azure;*/
    height: 30px;
    line-height: 30px;
    text-align: center;
    margin: 15px auto;
    /*display: none;*/
   }

   .a {
    background-color: burlywood;
    color: #FFFFFF;
   }
  </style>

  <script>
   //滚动事件
   function myScroll() {

    var i = document.body.scrollTop;
    var top = document.getElementById("top");
    var left = document.getElementById("left");
    var f1 = document.getElementById("f1");
    var f2 = document.getElementById("f2");
    var f3 = document.getElementById("f3");
    var f4 = document.getElementById("f4");
    var f5 = document.getElementById("f5");
    var f6 = document.getElementById("f6");

    //控制顶部
    if(i >= 1000) {
     top.style.display = "block";
     top.innerHTML = i;
    } else {
     top.style.display = "none";
    }

    //控制左侧
    if(i >= 2000) {
     left.style.display = "block";
    } else {
     left.style.display = "none";
    }

    //显示楼层

    if(i >= 2000 && i <= 2500) {
     f1.className = "a";
     f2.className = "";
     f3.className = "";
     f4.className = "";
     f5.className = "";
     f6.className = "";
    } else if(i > 2500 && i <= 3000) {
     f1.className = "";
     f2.className = "a";
     f3.className = "";
     f4.className = "";
     f5.className = "";
     f6.className = "";
    } else if(i > 3000 && i <= 3500) {
     f1.className = "";
     f2.className = "";
     f3.className = "a";
     f4.className = "";
     f5.className = "";
     f6.className = "";
    } else if(i > 3500 && i <= 4000) {
     f1.className = "";
     f2.className = "";
     f3.className = "";
     f4.className = "a";
     f5.className = "";
     f6.className = "";
    } else if(i > 4000 && i <= 4500) {
     f1.className = "";
     f2.className = "";
     f3.className = "";
     f4.className = "";
     f5.className = "a";
     f6.className = "";
    } else if(i > 4500 && i <= 5000) {
     f1.className = "";
     f2.className = "";
     f3.className = "";
     f4.className = "";
     f5.className = "";
     f6.className = "a";
    }

   }
  </script>

 </head>

 <body onscroll="myScroll()">
  <p id="left">
   <ul>
    <li id="f1">1F</li>
    <li id="f2">2F</li>
    <li id="f3">3F</li>
    <li id="f4">4F</li>
    <li id="f5">5F</li>
    <li id="f6">6F</li>

   </ul>

  </p>
  <p id="top"></p>
  <p class="cont"></p>

 </body>

</html>

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