Dynamic Drive CSS Library- CSS Gradient Shadow

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CSS Gradient Shadow

Author: Michael Burt

This is a CSS and JavaScript technique that lets you add a shadow to most elements on your page with a customizable shadow depth and coloring. Just give the element in question a class name of "shadow" to activate the effect.

The CSS:

<style type="text/css">

.shadow{
border:1px solid silver;
font:10pt arial;
position:relative;
display:inline;
background:white;
z-index:100
}

.shadow_inner{
overflow:hidden;
position:absolute;
top: -1000px;
filter:alpha(Opacity=10); /*modify to change the shade solidity/opacity, same as below*/
opacity:0.1; /*firefox 1.5 opacity*/
-moz-opacity:0.1; /*mozilla opacity*/
-khtml-opacity:0.1; /*opacity*/
z-index:10
}

</style>

<script type="text/javascript">

var gradientshadow={}
gradientshadow.depth=6 //Depth of shadow in pixels
gradientshadow.containers=[]

gradientshadow.create=function(){
var a = document.all ? document.all : document.getElementsByTagName('*')
for (var i = 0;i < a.length;i++) {
	if (a<i>.className == "shadow") {
		for (var x=0; x<gradientshadow.depth; x++){
			var newSd = document.createElement("DIV")
			newSd.className = "shadow_inner"
			newSd.id="shadow"+gradientshadow.containers.length+"_"+x //Each shadow DIV has an id of "shadowL_X" (L=index of target element, X=index of shadow (depth) 
			if (a<i>.getAttribute("rel"))
				newSd.style.background = a<i>.getAttribute("rel")
			else
				newSd.style.background = "black" //default shadow color if none specified
			document.body.appendChild(newSd)
		}
	gradientshadow.containers[gradientshadow.containers.length]=a<i>
	}
}
gradientshadow.position()
window.onresize=function(){
	gradientshadow.position()
}
}

gradientshadow.position=function(){
if (gradientshadow.containers.length>0){
	for (var i=0; i<gradientshadow.containers.length; i++){
		for (var x=0; x<gradientshadow.depth; x++){
  		var shadowdiv=document.getElementById("shadow"+i+"_"+x)
			shadowdiv.style.width = gradientshadow.containers<i>.offsetWidth + "px"
			shadowdiv.style.height = gradientshadow.containers<i>.offsetHeight + "px"
			shadowdiv.style.left = gradientshadow.containers<i>.offsetLeft + x + "px"
			shadowdiv.style.top = gradientshadow.containers<i>.offsetTop + x + "px"
		}
	}
}
}

if (window.addEventListener)
window.addEventListener("load", gradientshadow.create, false)
else if (window.attachEvent)
window.attachEvent("onload", gradientshadow.create)
else if (document.getElementById)
window.onload=gradientshadow.create

</script>

The HTML:

<p class="shadow" style="display: block" rel="red">This is some paragraph.<br />Set display="block" inside it.<br />This is some paragraph.</p>

<img src="http://img201.imageshack.us/img201/7907/streetkz4.gif" class="shadow" rel="blue" /><br />

<p><a href="http://www.dynamicdrive.com" class="shadow" rel="green">Some link</a></p>

Code Info

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Date Posted: 01/15/2007

Revision History: None

Usage Terms: Click here