Solved

fading image using opacity

Posted on 2008-10-14
4
717 Views
Last Modified: 2012-05-05
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.
<!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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Question by:vidhubala
  • 2
  • 2
4 Comments
 
LVL 7

Accepted Solution

by:
mltsy earned 500 total points
ID: 22711856
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)
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">

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Author Closing Comment

by:vidhubala
ID: 31505914
very nice. can u tell me the best way to preload in an array as i may have many images?
0
 
LVL 7

Expert Comment

by:mltsy
ID: 22717860
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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Author Comment

by:vidhubala
ID: 22721466
great. thanks.
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