LED Marquee

Curt Turner Aug 13, 2007

General

A variable width/speed marquee with realistic multi-color LED digits. No fonts required, and it uses only a single 36Kb image.

Multi-Color JavaScript LED marquee - IE & FF compatible - no fonts required - one image (36k) - user-defined speed & width - 012...789 abc...xyz +-*/=?^&().,'!$...

Notes

Created by: Curt Turner
Web Site: http://www.turner3d.net/
Posted: August 13, 2007

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: ledMarquee.js

/* This script and many more are available free online at
The JavaScript Source!! http://www.javascriptsource.com
Created by: Curt Turner | http://www.turner3d.net/ */

// the number of characters in the display
mwidth=20;

// delay in milliseconds between character shifts
mdelay=200;

// set to true if you want to reduce multiple spaces to a single space
dumpExtraSpaces=false;

mpos=0;
chars=" 0123456789abcdefghijklmnopqrstuvwxyz+-*/=?^&().,'!~$";
content=new Array();
color=new Array();

colors=new Array();
  colors['green']=0;
  colors['yellow']=-27;
  colors['red']=-54;
  colors['blue']=-81;

colorind=new Array();
  colorind[0]='green';
var mtxt;

function marqueeInit(){
 	mtxt=document.getElementById("ledmarquee").innerHTML.toLowerCase();
 	mtxt=mtxt.replace(/\.\.\./g,'~');
 	mtxt=mtxt.replace(/&/g,'&');
 	mtxt=mtxt.replace(/"/g,"'");
 	mtxt=mtxt.replace(/\[/g,'(');
 	mtxt=mtxt.replace(/\]/g,')');
 	mtxt=mtxt.replace(/\{/g,'(');
 	mtxt=mtxt.replace(/\}/g,')');
 	mtxt=mtxt.replace(/[\n\r]/g,' ');
 	if(dumpExtraSpaces) mtxt=mtxt.replace(/\s{2,}/g,' ');
 	bpos=mtxt.indexOf('<');
 	attempt=0;
 	while(bpos>=0){
  		mtxt.search(/<([^>]*)>/);
  		ctmp=RegExp.$1;
  		colorind[bpos]=ctmp;
  		mtxt=mtxt.replace(/<[^>]*>/,'');
  		bpos=mtxt.indexOf('<');
  		attempt++;
  		if(attempt>500){
  			// prevent browser lockups if something goes fishy (open <)
   			alert('parse failure');
  			 return false;
  		}
 	}
 	mcont="<div style='display:none'>"+mtxt+"<p> </p></div>";
 	for(i=0;i<mwidth;i++){
  		mcont+="<div class='digit' id='js_dig"+i+"'></div>\n";
  		mtxt=' '+mtxt+' ';
 	}
 	curcolor=0;
 	for(i=0;i<mtxt.length;i++){
  		if(colorind[i-mwidth]!=null){
  			 curcolor=colors[colorind[i-mwidth]]||0;
 		 }
 		color[i]=curcolor;
 		content[i]=-16*chars.indexOf(mtxt.substr(i,1));
 	}
 	document.getElementById("ledmarquee").style.width=(mwidth*16)+'px';
 	document.getElementById("ledmarquee").innerHTML=mcont;
 	document.getElementById("ledmarquee").style.visibility='visible';
 	mtimer=setInterval('marqueeScroll()',mdelay);
}

function marqueeScroll(){
	for(i=0;i<mwidth;i++){
 		document.getElementById('js_dig'+i).style.backgroundPosition=content[i+mpos]+'px '+color[i+mpos]+'px';
	}
	mpos++;
	if(mpos==mtxt.length-mwidth) mpos=0;
}

function onloadAppend(func){
 	var oldonload=window.onload;
 	if(typeof window.onload!='function'){
 	 	window.onload=func;
 	} else {
  		window.onload=function(){
 	  		if(oldonload) {
  				oldonload();
 			  }
 			  func();
 		 }
 	}
}

onloadAppend(marqueeInit);

CSS

Paste this code into your external CSS file or in the <style> section within the HEAD section of your HTML document.

.digit {
  float: left;
  width: 14px;
  height: 26px;
  margin-right: 2px;
  background: #000 url(ledmarquee.gif) 0px 0px;
}

#ledmarquee {
  height: 26px;
  visibility: hidden;
  background-color: #000;
}

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="ledMarquee.js"></script>

Body

Paste this code into the BODY section of your HTML document


<div id="ledmarquee">
Multi-<red>C<blue>o<yellow>l<green>o<red>r<green> JavaScript LED marquee - IE & FF compatible - <yellow>no fonts required<green> - one image (36k) - user-defined speed & width - 012...789 abc...xyz +-*/=?^&().,'!$...</div>

Other

Download the images using the URL below:

Download the images here

Leave a Response

(8 comments)

It's really good .... thanks for such beautiful article

alochan Purohit Dec 2, 2008

I think you mean[br /][br /]mtxt=mtxt.replace(/&/g,'&ampamp');

Foster McLane Sep 17, 2008

The link is given in the "Other" tab under "Source Code". You can [a href="http://javascriptsource.com/text-effects/ledmarquee.zip"]download it here[/a].

Lee Oct 3, 2007

Thanks, Gary. Not sure what you mean. The code you gave is the same.

Lee Oct 3, 2007

since its image you can use any picture editor to change it to your specific needs ... awesome script really !!!

overklokan Sep 15, 2007

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