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JS implements Fisheye effect dynamic enlargement menu code_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:35:511496browse

The example in this article describes the JS code to implement the Fisheye effect dynamic enlargement menu. Share it with everyone for your reference, the details are as follows:

This Fisheye Menu is a dynamic enlargement menu implemented using JS CSS This model does not use jQuery, but the effect is equally wonderful.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-fisheye-style-menu-demo/

The specific code is as follows: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Fisheye 动感放大的菜单</title>
<style>
#fisheye_menu {
 list-style: none;
 padding: 0;
 margin: 10px;
 height: 81px;
}
#fisheye_menu li {
 position: relative;
 display: block;
 float: left;
}
#fisheye_menu span {
 position: absolute;
 top: 100%;
 left: 0;
 text-align: center;
 width: 79px;
 padding: 1px;
 margin: 0;
 border: solid 1px #bbb; 
 color: #333;
 background: #eee;
}
#fisheye_menu a {
 text-decoration: none;
}
#fisheye_menu img {
 border: 0;
 vertical-align: top;
}
</style>
<script type='text/javascript'>
var fisheyemenu = {
 startSize : 55,
 endSize : 88,
 imgType : ".gif",
 init : function () {
  var animElements = document.getElementById("fisheye_menu").getElementsByTagName("img");
  var titleElements = document.getElementById("fisheye_menu").getElementsByTagName("span");
  for(var j=0; j<titleElements.length; j++) {
   titleElements[j].style.display = 'none';
  }
  for(var i=0; i<animElements.length; i++) {
   var y = animElements[i];
   y.style.width = fisheyemenu.startSize+'px';
   y.style.height = fisheyemenu.startSize+'px';
   fisheyemenu.imgSmall(y);
   animElements[i].onmouseover = changeSize;
   animElements[i].onmouseout = restoreSize;
  }
  function changeSize() {
   fisheyemenu.imgLarge(this);
   var x = this.parentNode.getElementsByTagName("span");
   x[0].style.display = 'block';
   if (!this.currentWidth) this.currentWidth = fisheyemenu.startSize;
   fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.endSize,15,10,0.333);
  }
  function restoreSize() {
   var x = this.parentNode.getElementsByTagName("span");
   x[0].style.display = 'none';
   if (!this.currentWidth) return;
   fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.startSize,15,10,0.5);
   fisheyemenu.imgSmall(this);
  }
 },
 resizeAnimation : function (elem,startWidth,endWidth,steps,intervals,powr) {
  if (elem.widthChangeMemInt) window.clearInterval(elem.widthChangeMemInt);
  var actStep = 0;
  elem.widthChangeMemInt = window.setInterval(
   function() {
    elem.currentWidth = fisheyemenu.easeInOut(startWidth,endWidth,steps,actStep,powr);
    elem.style.width = elem.currentWidth+"px";
    elem.style.height = elem.currentWidth+"px";
    actStep++;
    if (actStep > steps) window.clearInterval(elem.widthChangeMemInt);
   }
   ,intervals)
 },
 easeInOut : function (minValue,maxValue,totalSteps,actualStep,powr) {
  var delta = maxValue - minValue;
  var stepp = minValue+(Math.pow(((1 / totalSteps)*actualStep),powr)*delta);
  return Math.ceil(stepp)
 },
 imgSmall : function (obj) {
  imgSrc = obj.getAttribute("src");
  var typePos = imgSrc.indexOf(fisheyemenu.imgType, 0);
  var imgName = imgSrc.substr(0, typePos);
  obj.setAttribute("src", imgName+"_small"+fisheyemenu.imgType);
 },
 imgLarge : function (obj) {
  imgSrc = obj.getAttribute("src");
  var typePos = imgSrc.indexOf("_small", 0);
  var imgName = imgSrc.substr(0, typePos);
  obj.setAttribute("src", imgName+fisheyemenu.imgType);
 }
}
if ( typeof window.addEventListener != "undefined" )
 window.addEventListener( "load", fisheyemenu.init, false );
else if ( typeof window.attachEvent != "undefined" )
 window.attachEvent( "onload", fisheyemenu.init );
else {
 if ( window.onload != null ) {
 var oldOnload = window.onload;
 window.onload = function ( e ) {
  oldOnload( e );
  fisheyemenu.init();
 };
 }
 else
 window.onload = fisheyemenu.init;
}
</script>
 </head>
 <body>
  <div>
   <ul id="fisheye_menu">
    <li><a href="#1"><img src="images/icon.gif" alt="JS implements Fisheye effect dynamic enlargement menu code_javascript skills" /><span>Icon 1</span></a></li>
    <li><a href="#2"><img src="images/icon2.gif" alt="image description" /><span>Icon 2</span></a></li>
    <li><a href="#3"><img src="images/icon.gif" alt="脚本下载" /><span>Icon 3</span></a></li>
    <li><a href="#4"><img src="images/icon2.gif" alt="image description" /><span>Icon 4</span></a></li>
    <li><a href="#5"><img src="images/icon.gif" alt="jb51.net" /><span>Icon 5</span></a></li>
    <li><a href="#6"><img src="images/icon2.gif" alt="image description" /><span>Icon 6</span></a></li>
   </ul>
   </div>
 </body>
</html>

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

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