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JS CSS realizes the refreshing sliding menu effect code_javascript skills

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2016-05-16 15:35:351236browse

The example in this article describes the JS CSS code to achieve an atmospheric and fresh sliding menu effect. Share it with everyone for your reference, the details are as follows:

This is a relatively fresh sliding navigation menu. It is completed with CSS and JavaScript. When the mouse is placed on the first-level menu, the second-level menu will slide out. The compatibility is also good and suitable for most websites. Use Two background images, please copy the image address to download the image.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-css-dqqx-scroll-menu-demo/

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">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>滑动导航菜单</title>
<style>
body {margin:25px; font:12px Verdana, Arial, Helvetica}
* {padding:0; margin:0}
.dropdown {float:left; padding-right:5px}
.dropdown dt {width:188px; border:2px solid #9ac1c9; padding:8px; font-weight:bold; cursor:pointer; background:url(images/header.gif)}
.dropdown dt:hover {background:url(images/header_over.gif)}
.dropdown dd {position:absolute; overflow:hidden; width:208px; display:none; background:#fff; z-index:200; opacity:0}
.dropdown ul {width:204px; border:2px solid #9ac1c9; list-style:none; border-top:none}
.dropdown li {display:inline}
.dropdown a, .dropdown a:active, .dropdown a:visited {display:block; padding:5px; color:#333; text-decoration:none; background:#eaf0f2; width:194px}
.dropdown a:hover {background:#d9e1e4; color:#000}
.dropdown .underline {border-bottom:1px solid #b9d6dc}
</style>
<script type="text/javascript">
var DDSPEED = 10;
var DDTIMER = 15;
function ddMenu(id,d){
 var h = document.getElementById(id + '-ddheader');
 var c = document.getElementById(id + '-ddcontent');
 clearInterval(c.timer);
 if(d == 1){
  clearTimeout(h.timer);
  if(c.maxh && c.maxh <= c.offsetHeight){return}
  else if(!c.maxh){
   c.style.display = 'block';
   c.style.height = 'auto';
   c.maxh = c.offsetHeight;
   c.style.height = '0px';
  }
  c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
 }else{
  h.timer = setTimeout(function(){ddCollapse(c)},50);
 }
}
function ddCollapse(c){
 c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}
function cancelHide(id){
 var h = document.getElementById(id + '-ddheader');
 var c = document.getElementById(id + '-ddcontent');
 clearTimeout(h.timer);
 clearInterval(c.timer);
 if(c.offsetHeight < c.maxh){
  c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
 }
}
function ddSlide(c,d){
 var currh = c.offsetHeight;
 var dist;
 if(d == 1){
  dist = (Math.round((c.maxh - currh) / DDSPEED));
 }else{
  dist = (Math.round(currh / DDSPEED));
 }
 if(dist <= 1 && d == 1){
  dist = 1;
 }
 c.style.height = currh + (dist * d) + 'px';
 c.style.opacity = currh / c.maxh;
 c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
 if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
  clearInterval(c.timer);
 }
}
</script>
</head>
<body>
<dl class="dropdown">
 <dt id="one-ddheader" onmouseover="ddMenu('one',1)" onmouseout="ddMenu('one',-1)">源码下载</dt>
 <dd id="one-ddcontent" onmouseover="cancelHide('one')" onmouseout="ddMenu('one',-1)">
  <ul>
   <li><a href="#" class="underline">最新源码</a></li>
   <li><a href="#" class="underline">下载排行</a></li>
   <li><a href="#" class="underline">脚本资源</a></li>
   <li><a href="#">Ajax实例</a></li>
  </ul>
 </dd>
</dl>
<dl class="dropdown">
 <dt id="two-ddheader" onmouseover="ddMenu('two',1)" onmouseout="ddMenu('two',-1)">网页特效</dt>
 <dd id="two-ddcontent" onmouseover="cancelHide('two')" onmouseout="ddMenu('two',-1)">
  <ul>
   <li><a href="#" class="underline">菜单导航</a></li>
   <li><a href="#" class="underline">层和布局</a></li>
   <li><a href="#" class="underline">图片特效</a></li>
  </ul>
 </dd>
</dl>
</body>
</html>

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

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