JS CSS implements vertical navigation bar code with collision buffer effect

JS CSS implements vertical navigation bar code with collision buffer effect_javascript skills

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Release： 2016-05-16 15:39:10

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The example in this article describes the JS CSS code to implement vertical navigation bar with collision buffer effect. Share it with everyone for your reference. The details are as follows:

This is a navigation bar with collision buffer effect, a work dedicated to everyone by JavaScript Wonderful Classroom. It is a very good vertical menu. I hope you like it. The technologies used are JS and CSS.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-css-pzxg-r-nav-style-codes/

The specific code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<title>碰撞缓冲效果的导航条</title>
<style type="text/css">
* { padding: 0; margin: 0; }
li { list-style: none; }
body { background: #fff; }
ul { width: 202px; margin: 40px auto 0; position: relative; }
li { width: 200px; height: 30px; line-height: 30px; padding-left: 10px; border: 1px solid #ccc; border-left: 3px solid #666; font-size: 14px; color: #333; margin-bottom: 5px; position: relative; z-index: 2; }
a { color: #333; text-decoration: none; }
.active { font-weight: bold; background: #fff0f0; }
#bar { width: 10px; padding-left: 0; background: #cc6699; border: 1px solid #cc6699; position: absolute; top: 0; left: -14px; z-index: 3; }
</style>
<script>
var obj = null;
var aLis = null;
var oBar = null;
var iTime = null;
var iSpeed = 0;
var iAcc = 3;
var onOff = 0;
var iPrev = 0;
var iNext = 0;
function goTime()
{
 for(var i = 0; i < aLis.length; i+=1)
 {
  if(aLis[i] === this)
  {
   var iTarget = (aLis[0].offsetHeight + 5) * i;
   iNext = i;
   onOff = iNext - iPrev;
   if(iTime)
   {
    clearInterval(iTime);
   }
   if(onOff>=0)
   {
    iTime = setInterval("elasticity("+ iTarget +")",35);
   }
   else
   {
    iTime = setInterval("postpone("+ iTarget +")",35);
   }
   iPrev = iNext;
  }
  aLis[i].className="";
  this.className="active";
 }
}
function elasticity(target)
{
 var top = oBar.offsetTop;
 iSpeed+=iAcc;
 top += iSpeed;
 if(top >= target)
 {
  iSpeed*=-0.7;
  if(Math.abs(iSpeed)<=iAcc)
  {
   clearInterval(iTime);
   iTime=null;
  }
  top=target;
 }
 oBar.style.top = top + "px";
}
function postpone(target)
{
 if(oBar.offsetTop===target)
 {
  clearInterval(iTime);
  iTime=null;
 }
 else
 {
  iSpeed = (target - oBar.offsetTop)/4;
  oBar.style.top = oBar.offsetTop + iSpeed + "px";
 }
}
window.onload = function(){
 obj = document.getElementById("nav");
 aLis = obj.getElementsByTagName("li");
 oBar = document.getElementById("bar");
 for(var i = 0; i < aLis.length; i+=1)
 {
  if(aLis[i].id!="bar")
  {
   aLis[i].onmouseover = goTime;
  }
 }
};
</script>
</head>
<body>
<ul id="nav">
 <li class="active"><a href="#">首页</a></li>
 <li><a href="#">脚本之家</a></li>
 <li><a href="#">妙味课程</a></li>
 <li><a href="#">联系方式</a></li>
 <li id="bar">
</ul>
</body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming.