This article describes the example of JavaScript control web page layer collapse and expand the effect of the method. Share with you for your reference. The details are as follows:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<title> cool DIV Layer expansion and contraction effect </title>
<style>
* { margin:0; padding:0;}
body {
text-align:center;
font:75% Verdana, Arial, Helvetica, sans-serif;
}
h1 {
font:125% Arial, Helvetica, sans-serif;
text-align:left; font-weight:bolder;
background:#333; padding:3px;
display:block; color:#99CC00
}
.class1 {
width:40%; background:#CCC;
position:relative; margin:0 auto;
padding:5px;}
span { position:absolute; right:10px;
top:8px; cursor:pointer; color:yellow;
}
p { text-align:left; line-height:20px;
background:#333; padding:3px; margin-top:5px;
color:#99CC00
}
#class1content {
height:300px;overflow:hidden
}
</style>
<script>
function $(element){
return element = document.getElementById(element);
}
function $D(){
var d=$('class1content');
var h=d.offsetHeight;
var maxh=300;
function dmove(){
h+=50; // Sets the speed at which the layer is expanded
if(h>=maxh){
d.style.height='300px';
clearInterval(iIntervalId);
}else{
d.style.display='block';
d.style.height=h+'px';
}
}
iIntervalId=setInterval(dmove,2);
}
function $D2(){
var d=$('class1content');
var h=d.offsetHeight;
var maxh=300;
function dmove(){
h-=50;// Set the rate at which the layer contracts
if(h<=0){
d.style.display='none';
clearInterval(iIntervalId);
}else{
d.style.height=h+'px';
}
}
iIntervalId=setInterval(dmove,2);
}
function $use(){
var d=$('class1content');
var sb=$('stateBut');
if(d.style.display=='none'){
$D();
sb.innerHTML=' shrinkage ';
}else{
$D2();
sb.innerHTML=' an ';
}
}
</script>
</head>
<body>
<div class="class1">
<h1>DIV Layer expansion to hide the effect </h1>
<span id="stateBut" onclick="$use()"> an </span>
<p id="class1content"> There used to be 1 True love lies before me,
<br> I didn't cherish, <br> When I lost it I was too late to repent,
<br> Nothing in the world is more painful than this.
<br> If god could give it to me 1 A come back 1 Second chance,
<br> I'll say to the girl 3 A word: <br> I love you.
<br> If you must add in this love 1 A time limit,
<br> I hope it's... 1 Ten thousand years!"
</div>
</body>
</html>I hope this article has been helpful to your javascript programming.