Step Back in Time to the 1970s with RV's free DHTML and JavaScript text and graphic scripts

GROOVY 1970s EFFECT

This script has been tested on and shown to work with the following browsers: Internet Explorer version 7 and above Google Chrome version 4 and above Mozilla Firefox version 2 and above Apple Safari version 5 and above Opera version 9 and above (including Opera mobile) Android Browser version 3 and above

09-Jun-2013: Updated onload handler and minor performance improvements. 24-Nov-2011: Updated to use fixed positioning. 01-Oct-2008: First Release.
STEP 1: Copy and paste the code below so that it sits between the <head> and </head> tags at the top of your web-page: <script type="text/javascript"> // <![CDATA[ var border=100; // how wide is each border in pixels var effects=3; // how many of the effect are on the page var speed=50; // how fast is the animation (lower is faster) var colours=new Array("#9cf", "#c9f", "#fc9", "#f9c", "#cf9", "#9fc", "#6ff", "#f6f", "#ff6"); // above line lists colours for the groovy effect (the list can be as long or short as you like) /**************************** 1970s Groovy WebPage Effect (c)2008-13 mf2fm web-design * http://www.mf2fm.com/rv * * DON'T EDIT BELOW THIS BOX * ***************************/ function addLoadEvent(funky) { var oldonload=window.onload; if (typeof(oldonload)!='function') window.onload=funky; else window.onload=function() { if (oldonload) oldonload(); funky(); } } addLoadEvent(yowzah); var swide, shigh, boddie; var h=new Array(); var v=new Array(); var op=1/(effects+1); function yowzah() { if (document.getElementById) { var i, d, s; boddie=document.createElement("div"); s=boddie.style; s.position="fixed"; s.backgroundColor="transparent"; s.top="0px"; s.left="0px"; s.width="100%"; s.zIndex="-1"; set_width(); i=document.body.style.backgroundColor; if (document.body.parentNode) { if (i) document.body.parentNode.style.backgroundColor=i; document.body.style.backgroundColor="transparent"; } document.body.insertBefore(boddie, document.body.firstChild); for (i=0; i<effects10; i+=10) { d=document.createElement("div"); s=d.style; s.left="0px"; s.width="100%"; h[i]=Math.floor(Math.random()(shigh-border)/3); h[i+1]=shigh-Math.floor(Math.random()(shigh-border)/3); h[i+2]=(Math.random()<0.5?1:-1)scat(0); h[i+3]=(Math.random()<0.5?1:-1)scat(h[i+2]); s.position="absolute"; s.top=h[i]+"px"; s.height=(h[i+1]-h[1])+"px"; s.borderStyle="solid"; s.borderWidth=border+"px 0px"; jazzy(s, 'borderTopColor'); jazzy(s, 'borderBottomColor'); jazzy(s, 'backgroundColor'); s.opacity=op; if (navigator.appName=="Microsoft Internet Explorer") s.filter="alpha(opacity="+(100op)+")"; h[i+5]=s; boddie.appendChild(d); } for (i=0; i<effects10; i+=10) { d=document.createElement("div"); s=d.style; s.top="0px"; s.height="100%"; v[i]=Math.floor(Math.random()(swide-border)/3); v[i+1]=swide-Math.floor(Math.random()(swide-border)/3); v[i+2]=(Math.random()<0.5?1:-1)scat(0); v[i+3]=(Math.random()<0.5?1:-1)scat(v[i+2]); s.position="absolute"; s.left=v[i]+"px"; s.width=(v[i+1]-v[i])+"px"; s.borderStyle="solid"; s.borderWidth="0px "+border+"px"; jazzy(s, 'borderLeftColor'); jazzy(s, 'borderRightColor'); jazzy(s, 'backgroundColor'); if (navigator.appName=="Microsoft Internet Explorer") s.filter="alpha(opacity="+(100op)+")"; else s.opacity=op; v[i+5]=s; boddie.appendChild(d); } setInterval('groovy()', speed); }} var old_jazz=false; function jazz() { var new_jazz; do { new_jazz=colours[Math.floor(Math.random()colours.length)]; } while ( new_jazz==old_jazz ); old_jazz=new_jazz; return (new_jazz); } function jazzy(hip, jive) { var new_jive; do { new_jive=colours[Math.floor(Math.random()colours.length)]; } while (new_jive==hip[jive]); hip[jive]=new_jive; } function scat(no) { var yes; no=Math.abs(no); do { yes=2+Math.floor(Math.random()3); } while ( no==yes ); return (yes); } function groovy() { var i; for (i=0; i<effects*10; i+=10) { h[i]+=h[i+2]; h[i+1]+=h[i+3]; if (h[i+1]-h[i]<5) { h[i+4]=h[i+2]; h[i+2]=h[i+3]; h[i+3]=h[i+4]; jazzy(h[i+5], 'backgroundColor'); } if (h[i]<-border) { if (h[i+2]<0 && Math.random()<1/border) { h[i+2]=scat(h[i+3]); jazzy(h[i+5], 'borderTopColor'); } } if (h[i+1]>shigh) { if (h[i+3]>0 && Math.random()<1/border) { h[i+3]=-scat(h[i+2]); jazzy(h[i+5], 'borderBottomColor'); } } h[i+5].top=h[i]+"px"; h[i+5].height=(h[i+1]-h[i])+"px"; v[i]+=v[i+2]; v[i+1]+=v[i+3]; if (v[i+1]-v[i]<5) { v[i+4]=v[i+2]; v[i+2]=v[i+3]; v[i+3]=v[i+4]; jazzy(v[i+5], 'backgroundColor'); } if (v[i]<-border) { if (v[i+2]<0 && Math.random()<1/border) { v[i+2]=scat(v[i+3]); jazzy(v[i+5], 'borderLeftColor'); } } if (v[i+1]>swide) { if (v[i+3]>0 && Math.random()<1/border) { v[i+3]=-scat(v[i+2]); jazzy(v[i+5], 'borderRightColor'); } } v[i+5].left=v[i]+"px"; v[i+5].width=(v[i+1]-v[i])+"px"; } } window.onresize=set_width; function set_width() { var sw_min=999999; var sh_min=999999; if (document.documentElement && document.documentElement.clientWidth) { if (document.documentElement.clientWidth>0) sw_min=document.documentElement.clientWidth; if (document.documentElement.clientHeight>0) sh_min=document.documentElement.clientHeight; } if (typeof(self.innerWidth)!="undefined" && self.innerWidth) { if (self.innerWidth>0 && self.innerWidth<sw_min) sw_min=self.innerWidth; if (self.innerHeight>0 && self.innerHeight<sh_min) sh_min=self.innerHeight; } if (document.body.clientWidth) { if (document.body.clientWidth>0 && document.body.clientWidth<sw_min) sw_min=document.body.clientWidth; if (document.body.clientHeight>0 && document.body.clientHeight<sh_min) sh_min=document.body.clientHeight; } if (sw_min==999999 \|\| sh_min==999999) { sw_min=800; sh_min=600; } swide=sw_min; shigh=sh_min; boddie.style.height=shigh+"px"; } // ]]> </script> CLICK HERE to select the above script ready to paste it into your clipboard
STEP 2: If you wish, change the colours and other parameters at the start of the script. In addition to a psychodelic 1970s look, this script can produce a nice tartan effect if you select appropriate colours.
THAT'S IT When your page loads, the background of your page will be transmogrified into a cool 1970s groovy background. This effect is something you would expect from a flash file yet this simple javascript does a smoozy job, man!

Copyright notice: All scripts are © copyright mf2fm.com. You can use them wherever and whenever you wish, however the copyright notice at the start of the script should remain intact and a link back to this page would be appreciated. The address for this page is: http://www.mf2fm.com/rv/dhtml1970.php.

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