Added support for ITF-14 barcodes

ITF14.js

@@ -0,0 +1,95 @@
+function ITF14(ITF14number){
+
+	this.ITF14number = ITF14number+"";
+
+	this.valid = function(){
+		return valid(this.ITF14number);
+	};
+
+	this.encoded = function (){
+		if(valid(this.ITF14number)){
+			return encode(this.ITF14number);
+		}
+		return "";
+	}
+
+	//The structure for the all digits, 1 is wide and 0 is narrow
+	var digitStructure = {
+	 "0":"00110"
+	,"1":"10001"
+	,"2":"01001"
+	,"3":"11000"
+	,"4":"00101"
+	,"5":"10100"
+	,"6":"01100"
+	,"7":"00011"
+	,"8":"10010"
+	,"9":"01010"}
+
+	//The start bits
+	var startBin = "1010";
+	//The end bits
+	var endBin = "11101";
+
+	//Regexp for a valid ITF14 code
+	var regexp = /^[0-9]{13,14}$/;
+
+	//Convert a numberarray to the representing 
+	function encode(number){	
+		//Create the variable that should be returned at the end of the function
+		var result = "";
+
+		//If checksum is not already calculated, do it
+		if(number.length == 13){
+			number += checksum(number);
+		}
+
+		//Always add the same start bits
+		result += startBin;	
+
+		//Calculate all the digit pairs
+		for(var i=0;i<14;i+=2){
+			result += calculatePair(number.substr(i,2));
+		}
+
+		//Always add the same end bits
+		result += endBin;
+
+		return result;
+	}
+
+	//Calculate the data of a number pair
+	function calculatePair(twoNumbers){
+		var result = "";
+
+		var number1Struct = digitStructure[twoNumbers[0]];
+		var number2Struct = digitStructure[twoNumbers[1]];
+
+		//Take every second bit and add to the result
+		for(var i=0;i<5;i++){
+			result += (number1Struct[i]=="1") ? "111" : "1";
+			result += (number2Struct[i]=="1") ? "000" : "0";
+		}
+		return result;
+	}
+
+	//Calulate the checksum digit
+	function checksum(numberString){
+		var result = 0;
+
+		for(var i=0;i<13;i++){result+=parseInt(numberString[i])}
+
+		return result % 10;
+	}
+
+	function valid(number){
+		if(number.search(regexp)==-1){
+			return false;
+		}
+		//Check checksum if it is already calculated
+		else if(number.length==14){
+			return number[13] == checksum(number);
+		}
+		return true;
+	}
+}

README.md

@@ -8,6 +8,7 @@ The plugin uses Html5Canvas to generate draw the barcodes
 *  EAN (13)
 *  UPC-A
 *  CODE39
+*  ITF14
 
 Use
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