<script type="text/javascript">
<!-- Begin
/*
* Notes on hue
*
* This script uses hue rotation in the following manner:
* hue=0 is red (#FF0000)
* hue=60 is yellow (#FFFF00)
* hue=120 is green (#00FF00)
* hue=180 is cyan (#00FFFF)
* hue=240 is blue (#0000FF)
* hue=300 is magenta (#FF00FF)
* hue=360 is hue=0 (#FF0000)
*
* Notes on the script
*
* This script should function in any browser that supports document.getElementById
* It has been tested in Netscape7, Mozilla Firefox 1.0, and Internet Explorer 6
*
* Accessibility
*
* The script does not write the string out, but rather takes it from an existing
* HTML element. Therefore, users with javascript disabled will not be adverely affected.
* They just won't get the pretty colors.
*/
/*
* splits par.firstChild.data into 1 span for each letter
* ARGUMENTS
* span - HTML element containing a text node as the only element
*/
function toSpans(span) {
var str=span.firstChild.data;
var a=str.length;
span.removeChild(span.firstChild);
for(var i=0; i<a; i++) {
var theSpan=document.createElement("SPAN");
theSpan.appendChild(document.createTextNode(str.charAt(i)));
span.appendChild(theSpan);
}
}
/*
* creates a rainbowspan object
* whose letters will be colored [deg] degrees of hue
* ARGUMENTS
* span - HTML element to apply the effect to (text only, no HTML)
* hue - what degree of hue to start at (0-359)
* deg - how many hue degrees should be traversed from beginning to end of the string (360 => once around, 720 => twice, etc)
* brt - brightness (0-255, 0 => black, 255 => full color)
* spd - how many ms between moveRainbow calls (less => faster)
* hspd - how many hue degrees to move every time moveRainbow is called (0-359, closer to 180 => faster)
*/
function RainbowSpan(span, hue, deg, brt, spd, hspd) {
this.deg=(deg==null?360:Math.abs(deg));
this.hue=(hue==null?0:Math.abs(hue)%360);
this.hspd=(hspd==null?3:Math.abs(hspd)%360);
this.length=span.firstChild.data.length;
this.span=span;
this.speed=(spd==null?50:Math.abs(spd));
this.hInc=this.deg/this.length;
this.brt=(brt==null?255:Math.abs(brt)%256);
this.timer=null;
toSpans(span);
this.moveRainbow();
}
/*
* sets the colors of the children of [this] as a hue-rotating rainbow starting at this.hue;
* requires something to manage ch externally
* I had to make the RainbowSpan class because M$IE wouldn't let me attach this prototype to [Object]
*/
RainbowSpan.prototype.moveRainbow = function() {
if(this.hue>359) this.hue-=360;
var color;
var b=this.brt;
var a=this.length;
var h=this.hue;
for(var i=0; i<a; i++) {
if(h>359) h-=360;
if(h<60) { color=Math.floor(((h)/60)*b); red=b;grn=color;blu=0; }
else if(h<120) { color=Math.floor(((h-60)/60)*b); red=b-color;grn=b;blu=0; }
else if(h<180) { color=Math.floor(((h-120)/60)*b); red=0;grn=b;blu=color; }
else if(h<240) { color=Math.floor(((h-180)/60)*b); red=0;grn=b-color;blu=b; }
else if(h<300) { color=Math.floor(((h-240)/60)*b); red=color;grn=0;blu=b; }
else { color=Math.floor(((h-300)/60)*b); red=b;grn=0;blu=b-color; }
h+=this.hInc;
this.span.childNodes[i].style.color="rgb("+red+", "+grn+", "+blu+")";
}
this.hue+=this.hspd;
}
// End -->
</script>
</HEAD>
<!-- STEP TWO: Copy this code into the BODY of your HTML document -->
<BODY>
<div align="center">
<h1 id="r1">Сюда напишите ваш текст</h1>
</div>
<script type="text/javascript">
var r1=document.getElementById("r1"); //get span to apply rainbow
var myRainbowSpan=new RainbowSpan(r1, 0, 360, 255, 50, 18); //apply static rainbow effect
myRainbowSpan.timer=window.setInterval("myRainbowSpan.moveRainbow()", myRainbowSpan.speed);
</script>
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