Random Custom Serial Number Generator

A brief example on how to generate random serial numbers with JavaScript. Enjoy!

// Symbols Array (A-Z, 0-9)
var Symbols = new Array();

// Gets the ascii code for a certain character
function GetAsciiBySymbol(letter)
{
var code = letter.charCodeAt(0);
return code;
}

// Populates a certain array with the A-Z, 0-9 symbols
function PopulateArray(array) {
var Position = 0;

// Letters
for(i=GetAsciiBySymbol('A'); i<=GetAsciiBySymbol('Z'); i++) {
array[Position] = String.fromCharCode(i);
Position++;
}

// Numbers
for(i=GetAsciiBySymbol('0'); i<=GetAsciiBySymbol('9'); i++) {
array[Position] = String.fromCharCode(i);
Position++;
}

}

// Gets the array symbol by a certain index
function GetSymbol(index) {
return Symbols[index];
}

// Generates a new Serial Number
function GenerateSerial(serialLength, separatorSymbol, separatorPositions) {
var serial = "";
var Offset = 0;

for(i=0; i
var rnd = Math.floor(Math.random()*Symbols.length);
serial += GetSymbol(rnd);
}

if(SeparatorPositionsOk(separatorPositions,serialLength)) {
for(i=0; i
var position = separatorPositions[i];
serial = serial.substring(0,position + Offset) + separatorSymbol + serial.substring(position + Offset, serial.length); Offset++;
}
}

return serial;
}

// Checks if a certain array contains only items less than a maximum value
function SeparatorPositionsOk(array, maxValue) {
for(i=0; i maxValue) {
return false;
}
}

return true;
}

// Populate Symbols
PopulateArray(Symbols);

// Example 1 - Format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
var SepPos = new Array();
SepPos[0] = 5;
SepPos[1] = 10;
SepPos[2] = 15;
SepPos[3] = 20;
var NewSerial = GenerateSerial(25, "-",SepPos);
alert("Serial Number: " + NewSerial);


// Example 2 - Format: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
SepPos = new Array();
SepPos[0] = 8;
SepPos[1] = 12;
SepPos[2] = 16;
SepPos[3] = 20;
SepPos[4] = 24;
NewSerial = GenerateSerial(32, "-",SepPos);
alert("Serial Number: " + NewSerial);

// Example 3 - Format: XXX-XXXXXXX
SepPos = new Array();
SepPos[0] = 3;
NewSerial = GenerateSerial(10, "-",SepPos);
alert("Serial Number: " + NewSerial);