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    Further Reading > JavaScript and Perl
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    		JavaScript and Perl

    JavaScript can be used to control all manner of page properties ranging from the behaviour of forms to the layout of entire tables. 

    
//
// colorcycle.js
// Copyright (c)2000 Mike Stannett All Rights Reserved
// http://noisefactory.co.uk  (web@noisefactory.co.uk)
//
// You are free to use this script if and only this
// header information stays intact, including my
// copyright notice.
//
// Usage: onLoad="colorfade(from,to,nsteps);"
//
//  from   = starting colour, rrggbb
//  to     = ending colour, rrggbb
//  nsteps = how many steps for the transition?
//

hexdigits = new Array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f');

function colorcode(i) {
  var value = i%256;
  return "" + hexdigits[Math.floor(value/16)] + hexdigits[value%16];
}

function colorfade( from, to, nsteps ) {
  if ( nsteps == 0 ) nsteps = 1;
  r0 = parseInt(from.substring(0,2),16);
  g0 = parseInt(from.substring(2,4),16);
  b0 = parseInt(from.substring(4,6),16);
  r1 = parseInt(to.substring(0,2),16);
  g1 = parseInt(to.substring(2,4),16);
  b1 = parseInt(to.substring(4,6),16);
  var bgc;
  for ( var n=0; n<nsteps; n++) {
    bgc = "#"
        + colorcode( Math.floor( r0*(nsteps-n)/nsteps  +  r1*(n/nsteps) ) )
        + colorcode( Math.floor( g0*(nsteps-n)/nsteps  +  g1*(n/nsteps) ) )
        + colorcode( Math.floor( b0*(nsteps-n)/nsteps  +  b1*(n/nsteps) ) );
    document.bgColor = bgc;
    for (var m=0; m<10; m++);
  }
}

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