convert numbers to roman numerals

findRomanNumeral.js

function findRomanNumeral(number) {
    var romanNumbers = {
        1 : "I",
        2 : "II",
        3 : "III",
        4 : "IV",
        5 : "V",
        6 : "VI",
        7 : "VII", 
        8 : "VIII",
        9 : "IX",
        10 : "X",
        20 : "XX",
        30 : "XXX",
        40 : "XL",
        50 : "L",
        60 : "LX",
        70 : "LXX",
        80 : "LXXX",
        90 : "XC",
        100 : "C",
        200 : "CC",
        300 : "CCC",
        400 : "CD",
        500 : "D",
        600 : "DC",
        700 : "DCC",
        800 : "DCCC",
        900 : "CM",
        1000 : "M"
    };
    
    // find digit places - ones, tens, hundreds, thousands etc...
    // last element in digitPlaces array is ones, second last is 
    // tens, and so on
    // ********************************************************
    var digitPlaces = [];
    var divisor = Math.pow(10, Math.floor(Math.log(number)/Math.log(10)));
    digitPlaces.push(Math.floor(number / divisor));
    while (divisor > 1) {
        digitPlaces.push(Math.floor((number % divisor)/(divisor / 10)));
        divisor /= 10;
    }

    // convert digit places array to roman numeral
    // *********************************************
    var result = "";
    
    // thousands
    if (number >= 1000) { 
        var thousands = 0, tmpThousands = ""; 
        for (var i = 0; i < digitPlaces.length - 3; i++) {
            tmpThousands += digitPlaces[i];
        }
        thousands = parseInt(tmpThousands);
        
        for (var i=0; i<thousands; i++) { 
            result += romanNumbers[1000];
        }
    }
    
    // hundreds
    if (number >= 100) {
        var hundreds = digitPlaces[digitPlaces.length - 3];
        if(hundreds > 0)
            result += romanNumbers[hundreds * 100];
    }
    
    // tens
    if (number >= 10) {
        var tens = digitPlaces[digitPlaces.length - 2];
        if(tens > 0)
            result += romanNumbers[tens * 10];
    }
    
    // ones
    if (number >= 1) {
        var ones = digitPlaces[digitPlaces.length - 1];
        if(ones > 0)
            result += romanNumbers[ones];
    }
    
    return result;
}