JS implements Fisheye effect dynamic enlargement menu code

JS implements Fisheye effect dynamic enlargement menu code_javascript skills

WBOY

Release： 2016-05-16 15:35:51

Original

1458 people have browsed it

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>

Copy after login

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