Using JavaScript to "animate" my webpage
I thought I'd write a simple script to animate my webpage a little.
The basic idea was to make a div grow bigger, when I push a button once and then shrink to it's original size, when I push it again. I handled the growing part well, but I can't get it to shrink again.
I'm including a complete example, could you help me fix it?
<!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">
<head>
<title>Test</title>
<meta http-equiv="Content-Language" content="Estonian" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15" />
</head>
<body>
<script type="text/javascript">
var i;
var increasing = new Boolean("true");
var height;
function testFunction() {
height = parseInt(document.getElementById("testDiv").offsetHeight);
if( increasing == true ) {
i = height + 4;
document.getElementById("testDiv").style.height = i + "px";
开发者_运维知识库 if( height >= 304 ) {
increasing = false;
}
else {
pause(30);
}
}
else {
i = height - 4;
document.getElementById("testDiv").style.height = i + "px";
if( height <= 104 ) {
increasing = true;
}
else {
pause(30);
}
}
}
function pause(ms) {
setTimeout("testFunction()", ms);
}
</script>
<button id="button" type="button" onclick="testFunction();">Do it!</button.
<div id="testDiv" style="border: 2px solid black; width: 400px; height: 100px; text-align: center;">
Hello!
</div>
</body>
</html>
Use a standard library like jQuery to do this, don't do it yourself as it won't be cross-browser for sure.
With jQuery, you can do things like this:
$("#div-id").animate({"height": 300}, 1000);
That'll change the div height to 300 px in 1000 ms = 1 second.
加载中,请稍侯......
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