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I was just wondering if it is possible to create a fill animation using CSS or javascript?
basically I want to create a fill animation like the one shown in the image bellow:
http://i40.tinypic.com/eit6ia.png
the red being the fill and the black is being empty.
This is my code that Jeff posted for images but it doesn't work for some reason! am i missing something??
<!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=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
#black{
position:absolute;
z-index:2;
color:black;
font-weight:bold;
font-size:2em;
width:768px;
}
#red {
position:absolute;
z-index:10;
left:8px;
width:0px;
overflow:hidden;
font-weight:bold;
font-size:2em;
color:red;
}
</style>
<script language="javascript">
var red = document.getElementById('red');
red.style.width = "0px";
red.style.height = "1024px";
var animation = setInterval(function(){
if(parseInt(red.style.width,10) == 768)
clearInterval(animation);
red.style.width = parseInt(red.style.width,10)+2 +"px";
},10);
</script>
</head>
<body>
<div><img id="black" src="http://www.ratemotorcycle.com/image1/5/53/kawasaki-ninja-zx10r-2013.jpg"/><img id="red" src="http://imageshack.us/a/img39/3517/13kawasakizx10r1.jpg"/></div>
</body>
</html>
366
Here is a way in Pure JavaScript. I had fun with CSS styling.
<div>
<img id="black" src="http://www.ratemotorcycle.com/image1/5/53/kawasaki-ninja-zx10r-2013.jpg" />
<img id="red" src="http://imageshack.us/a/img39/3517/13kawasakizx10r1.jpg" />
</div>
#black {
/* Added the position and the z-index to ensure images overlay correctly */
position:absolute;
z-index:2;
/* styling fun */
color:black;
font-weight:bold;
font-size:2em;
/* default width */
width:768px;
}
#red {
/* Position and z-index let us overlay the #black and #red elements*/
position:absolute;
z-index:10;
/* This is to put the element directly over the #black element
(compensating the margin/padding of the #black element */
left:8px;
/* We make the initial width 0px and hide the overflow. */
width:0px;
overflow:hidden;
/* Fun styling */
font-weight:bold;
font-size:2em;
color:red;
}
var red = document.getElementById('red');
red.style.width = "0px";
/* set the height so the image does not "scale" */
red.style.height = "1024px";
var animation = setInterval(function () {
if (parseInt(red.style.width, 10) == 768) clearInterval(animation);
red.style.width = parseInt(red.style.width, 10) + 2 + "px";
}, 10);
<div>
<span id="black">LOGO</span>
<span id="red">LOGO</span>
</div>
#black{
/* Fun styling */
color:black;
font-weight:bold;
font-size:2em;
}
#red {
/* Position and z-index lets us overlay the #black and #red elements*/
position:absolute;
z-index:10;
/* This is to put the element directly over the #black element
(compensating the margin/padding of the #black element */
left:8px;
/* We make the initial width 0px and hide the overflow. */
width:0px;
overflow:hidden;
/* Fun styling */
font-weight:bold;
font-size:2em;
color:red;
}
/* On window load (when the page is loaded) */
window.onload = function(){
/* We select our #red element */
var red = document.getElementById('red');
/* Set the width of #red to 0px */
red.style.width = "0px";
/* Create an action that will execute every 50ms */
var animation = setInterval(function(){
/* If the element is at the desired width, we clear the animation loop */
if(red.style.width == "91px")
clearInterval(animation);
/* Otherwise, we set the width+=1, ensuring to get the numeric value of it only */
red.style.width = parseInt(red.style.width,10)+1 +"px";
},50);
};
$('#red').css('width','0px');
$('#red').animate({'width':'91px'},4500);
JSPerf results
After an unofficial test battery, the jQuery animation for this purpose would be ran 85% slower than its pure JavaScript counterpart. This is a huge performance difference.
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