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fading image using opacity
Posted on 2008-10-14
i have a code that shows a fade in image onload.
i have 2 other images and needs to be replaced when i click on the buttons "one" and "two" in the same place. pl help. attached images in zip.
i have 2 other images and needs to be replaced when i click on the buttons "one" and "two" in the same place. pl help. attached images in zip.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Onload image fades without Flash | clagnut/sandbox</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<style type="text/css">
#photoholder {
width:450px;
height:338px;
border:1px solid #666;
}
#thephoto {
width:450px;
height:338px;
}
TABLE {
margin-bottom:1em;
border-collapse:collapse;
}
TH {
font-weight:normal;
font-style:italic;
white-space:nowrap;
text-align:left;
}
TD, TH {
vertical-align:top;
padding:0.25em 0.5em;
border:1px solid #ddd;
}
</style>
<script type="text/javascript">
<!--
document.write("<style type='text/css'>#thephoto {visibility:hidden;}</style>");
function initImage() {
imageId = 'thephoto';
image = document.getElementById(imageId);
setOpacity(image, 0);
image.style.visibility = "visible";
fadeIn(imageId,0);
}
function fadeIn(objId,opacity) {
if (document.getElementById) {
obj = document.getElementById(objId);
if (opacity <= 100) {
setOpacity(obj, opacity);
opacity += 10;
window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
}
}
}
function setOpacity(obj, opacity) {
opacity = (opacity == 100)?99.999:opacity;
// IE/Win
obj.style.filter = "alpha(opacity:"+opacity+")";
// Safari<1.2, Konqueror
obj.style.KHTMLOpacity = opacity/100;
// Older Mozilla and Firefox
obj.style.MozOpacity = opacity/100;
// Safari 1.2, newer Firefox and Mozilla, CSS3
obj.style.opacity = opacity/100;
}
window.onload = function() {initImage()}
// -->
</script>
</head>
<body>
<p id="photoholder">
<img src="ithaka.jpg" alt="Picturesque fishing village on Ithaka." id="thephoto" />
</p>
<input type="button" onclick="initImage()" value="one">
<input type="button" onclick="initImage()" value="two">
</body>
</html>
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4 Comments
It looks like you've got it all setup except for the part where you replace the image with a new image. I would add that into the initImage function, like below:
(You might also want to preload the images, so they are loaded before they start fading in)
(You might also want to preload the images, so they are loaded before they start fading in)
function initImage(newImageSrc) {
imageId = 'thephoto';
image = document.getElementById(imageId);
setOpacity(image, 0);
image.style.visibility = "visible";
if(newImageSrc) image.src = newImageSrc;
fadeIn(imageId,0);
}
...
<input type="button" onclick="initImage('one.jpg')" value="one">
<input type="button" onclick="initImage('two.jpg')" value="two">
The easiest thing to do is stick a "preload" div at the bottom of your document like in the first example below. You can also use a function, like the second example.
<!-- Example 1 -->
<div style="display:none" id="preloads">
<img src="image1.src" alt="" />
<img src="image2.src" alt="" />
</div>
<!-- Example 2 -->
<script>
function preload() {
var d=document;
if(d.images){
if(!d.imgs) d.imgs=new Array();
var i,j=d.imgs.length,a=preload.arguments;
for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){
d.imgs[j]=new Image;
d.imgs[j++].src=a[i];
}
}
}
//in body.onload ...
preload("image1.jpg", "image2.jpg", ...);
</script>
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