CODE39.js

function CODE39(string){

	var code39 = [
 [0,"0","101000111011101"]
,[1,"1","111010001010111"]
,[2,"2","101110001010111"]
,[3,"3","111011100010101"]
,[4,"4","101000111010111"]
,[5,"5","111010001110101"]
,[6,"6","101110001110101"]
,[7,"7","101000101110111"]
,[8,"8","111010001011101"]
,[9,"9","101110001011101"]
,[10,"A","111010100010111"]
,[11,"B","101110100010111"]
,[12,"C","111011101000101"]
,[13,"D","101011100010111"]
,[14,"E","111010111000101"]
,[15,"F","101110111000101"]
,[16,"G","101010001110111"]
,[17,"H","111010100011101"]
,[18,"I","101110100011101"]
,[19,"J","101011100011101"]
,[20,"K","111010101000111"]
,[21,"L","101110101000111"]
,[22,"M","111011101010001"]
,[23,"N","101011101000111"]
,[24,"O","111010111010001"]
,[25,"P","101110111010001"]
,[26,"Q","101010111000111"]
,[27,"R","111010101110001"]
,[28,"S","101110101110001"]
,[29,"T","101011101110001"]
,[30,"U","111000101010111"]
,[31,"V","100011101010111"]
,[32,"W","111000111010101"]
,[33,"X","100010111010111"]
,[34,"Y","111000101110101"]
,[35,"Z","100011101110101"]
,[36,"-","100010101110111"]
,[37,".","111000101011101"]
,[38," ","100011101011101"]
,[39,"$","100010001000101"]
,[40,"/","100010001010001"]
,[41,"+","100010100010001"]
,[42,"%","101000100010001"]];

	this.valid = valid;

	//The public encoding function
	this.encoded = function(){
		if(valid(string)){
			return encode(string);
		}
		else{
			return "";
		}
	}

	//This regexp is used for validation
	var regexp = /^[0-9a-zA-Z\-\.\ \$\/\+\%]+$/;

	//Use the regexp variable for validation
	function valid(){
		if(string.search(regexp)==-1){
			return false;
		}
		return true;
	}

	//Encode the characters
	function encode(string){
	    string = string.toUpperCase();

		var result = "";
		result += "1000101110111010";
		for(var i=0;i<string.length;i++){
			result+=encodingByChar(string[i])+"0";
		}
		result += "1000101110111010";
		return result;
	}
	
	//Get the encoded data of a character
	function encodingByChar(character){
		for(var i=0;i<code39.length;i++){
			if(code39[i][1]==character){
				return code39[i][2];
			}
		}
		return "";
	}
}