JavaScript numbers to Words

Question

I\'m trying to convert numbers into english words, for example 1234 would become: \"one thousand two hundred thirty four\".

My Tact

Answer 1

Here, I wrote an alternative solution:

1) The object containing the string constants:

var NUMBER2TEXT = {
    ones: ['', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen'],
    tens: ['', '', 'twenty', 'thirty', 'fourty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'],
    sep: ['', ' thousand ', ' million ', ' billion ', ' trillion ', ' quadrillion ', ' quintillion ', ' sextillion ']
};

2) The actual code:

(function( ones, tens, sep ) {

    var input = document.getElementById( 'input' ),
        output = document.getElementById( 'output' );

    input.onkeyup = function() {
        var val = this.value,
            arr = [],
            str = '',
            i = 0;

        if ( val.length === 0 ) {
            output.textContent = 'Please type a number into the text-box.';
            return;  
        }

        val = parseInt( val, 10 );
        if ( isNaN( val ) ) {
            output.textContent = 'Invalid input.';
            return;   
        }

        while ( val ) {
            arr.push( val % 1000 );
            val = parseInt( val / 1000, 10 );   
        }

        while ( arr.length ) {
            str = (function( a ) {
                var x = Math.floor( a / 100 ),
                    y = Math.floor( a / 10 ) % 10,
                    z = a % 10;

                return ( x > 0 ? ones[x] + ' hundred ' : '' ) +
                       ( y >= 2 ? tens[y] + ' ' + ones[z] : ones[10*y + z] );
            })( arr.shift() ) + sep[i++] + str;
        }

        output.textContent = str;
    };

})( NUMBER2TEXT.ones, NUMBER2TEXT.tens, NUMBER2TEXT.sep );

Live demo: http://jsfiddle.net/j5kdG/

Answer 2

I think this will help you

    aTens = [ "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy","Eighty", "Ninety"];

    aOnes = [ "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" ];
    var aUnits = "Thousand";
    function convertnumbertostring(){
       var num=prompt('','enter the number');
       var j=6;
       if(num.length<j){
       var y = ConvertToWords(num);
       alert(y);
       }else{
          alert('Enter the number of 5 letters')
       }
    };
    function ConvertToHundreds(num)
    {
       var cNum, nNum;
       var cWords = "";
       if (num > 99) {
          /* Hundreds. */
          cNum = String(num);
          nNum = Number(cNum.charAt(0));
          cWords += aOnes[nNum] + " Hundred";
          num %= 100;
          if (num > 0){
             cWords += " and "
          }
       }

       if (num > 19) {
          /* Tens. */
          cNum = String(num);
          nNum = Number(cNum.charAt(0));
          cWords += aTens[nNum - 2];
          num %= 10;
          if (num > 0){
             cWords += "-";
          }
       }
       if (num > 0) {
          /* Ones and teens. */
          nNum = Math.floor(num);
          cWords += aOnes[nNum];
       }
       return(cWords);

    }
    function ConvertToWords(num)
    {
       var cWords;
       for (var i = 0; num > 0; i++) { 
           if (num % 1000 > 0) {
              if (i != 0){
                 cWords = ConvertToHundreds(num) + " " + aUnits + " " + cWords;
              }else{
                 cWords = ConvertToHundreds(num) + " ";
              }        
           }
           num = (num / 1000);
       }
         return(cWords);
    }

Answer 3

I tried Muhammad's solution, but had some issues and wanted to use decimals so I made some changes and converted to coffeescript and angular. Please bear in mind that js and coffeescript are not my strong suits, so use with care.

$scope.convert = (number, upper=0) ->
number = +number
# console.log "inside convert and the number is:  " + number

if number < 0
    # console.log 'Number Must be greater than zero = ' + number
    return ''

if number > 100000000000000000000
    # console.log 'Number is out of range = ' + number
    return ''
if isNaN(number)
    console.log("NOT A NUMBER")
    alert("Not a number = ")
    return ''
else
    console.log "at line 88 number is:  " + number
    quintillion = Math.floor(number / 1000000000000000000)
    ### quintillion ###

    number -= quintillion * 1000000000000000000
    quar = Math.floor(number / 1000000000000000)
    # console.log "at line 94 number is:  " + number

    ### quadrillion ###

    number -= quar * 1000000000000000
    trin = Math.floor(number / 1000000000000)
    # console.log "at line 100 number is:  " + number

    ### trillion ###
    number -= trin * 1000000000000
    Gn = Math.floor(number / 1000000000)
    # console.log "at line 105 number is:  " + number

    ### billion ###

    number -= Gn * 1000000000
    million = Math.floor(number / 1000000)
    # console.log "at line 111 number is:  " + number

    ### million ###

    number -= million * 1000000
    Hn = Math.floor(number / 1000)
    # console.log "at line 117 number is:  " + number

    ### thousand ###

    number -= Hn * 1000
    Dn = Math.floor(number / 100)
    # console.log "at line 123 number is:  " + number

    ### Tens (deca) ###

    number = number % 100
    # console.log "at line 128 number is:  " + number

    ### Ones ###
    tn      = Math.floor(number / 10)
    one     = Math.floor(number % 10)
    # tn = Math.floor(number / 1)
    change  = Math.round((number % 1) * 100)
    res     = ''
    # console.log "before ifs"
    if quintillion > 0
        res += $scope.convert(quintillion) + ' Quintillion'
    if quar > 0
        res += $scope.convert(quar) + ' Quadrillion'
    if trin > 0
        res += $scope.convert(trin) + ' Trillion'
    if Gn > 0
        res += $scope.convert(Gn) + ' Billion'
    if million > 0
        res += (if res == '' then '' else ' ') + $scope.convert(million) + ' Million'
    if Hn > 0
        res += (if res == '' then '' else ' ') + $scope.convert(Hn) + ' Thousand'
    if Dn
        res += (if res == '' then '' else ' ') + $scope.convert(Dn) + ' Hundred'
    # console.log "the result is:  " + res
    ones = Array('', 'One', 'Two', 'Three', 'Four', 'Five', 'Six', 'Seven', 'Eight', 'Nine', 'Ten', 'Eleven', 'Twelve', 'Thirteen', 'Fourteen', 'Fifteen', 'Sixteen', 'Seventeen', 'Eightteen', 'Nineteen')
    tens = Array('', '', 'Twenty', 'Thirty', 'Fourty', 'Fifty', 'Sixty', 'Seventy', 'Eigthy', 'Ninety')
    # console.log "the result at 161 is:  " + res
    if tn > 0 or one > 0
        if !(res == '')
            # res += ' and '
            res += ' '
            # console.log "the result at 164 is:  " + res
        if tn < 2
            res += ones[tn * 10 + one]
            # console.log "the result at 168is:  " + res
        else
            res += tens[tn]
            if one > 0
                res += '-' + ones[one]
            # console.log "the result at 173 is:  " + res
    if change > 0
        if res == ''
            res =  change + "/100"
        else
            res += ' and ' + change + "/100"

    if res == ''
        console.log 'Empty = ' + number
        res = ''
    if +upper == 1
        res = res.toUpperCase()
    $scope.newCheck.amountInWords = res
    return res

$scope.is_numeric = (mixed_var) -> # console.log "mixed var is: " + mixed_var (typeof mixed_var == 'number' or typeof mixed_var == 'string') and mixed_var != '' and !isNaN(mixed_var)

Answer 4

<script src="http://www.ittutorials.in/js/demo/numtoword.js" type="text/javascript"></script>
    HTML - Convert numbers to words using JavaScript</h1>
<input id="Text1" type="text" onkeypress="return onlyNumbers(this.value);" onkeyup="NumToWord(this.value,'divDisplayWords');"
    maxlength="9" style="background-color: #efefef; border: 2px solid #CCCCC; font-size: large" />
<br />
<br />
<div id="divDisplayWords" style="font-size: 13; color: Teal; font-family: Arial;">
</div>

Answer 5

If anybody ever wants to do this but in Spanish (en español), here's my code based on Hardik's

function num2str(num, moneda) {
    moneda = moneda || (num !== 1 ? "pesos" : "peso");
    var fraction = Math.round(__cf_frac(num) * 100);
    var f_text = " (" + pad(fraction, 2) + "/100 M.N.)";


    return __cf_convert_number(num) + " " + moneda + f_text;
}

function __cf_frac(f) {
    return f % 1;
}

function __cf_convert_number(number) {
    if ((number < 0) || (number > 999999999)) {
        throw Error("N\u00famero fuera de rango");
    }
    var millon = Math.floor(number / 1000000);
    number -= millon * 1000000;
    var cientosDeMiles = Math.floor(number / 100000);
    number -= cientosDeMiles * 100000;
    var miles = Math.floor(number / 1000);
    number -= miles * 1000;
    var centenas = Math.floor(number / 100);
    number = number % 100;
    var tn = Math.floor(number / 10);
    var one = Math.floor(number % 10);
    var res = "";

    var cientos = Array("", "cien", "doscientos", "trescientos", "cuatrocientos", "quinientos", "seiscientos", "setecientos", "ochocientos", "novecientos");
    if (millon > 0) {
        res += (__cf_convert_number(millon) + (millon === 1 ? " mill\u00f3n" : " millones"));
    }
    if (cientosDeMiles > 0) {
        res += (((res == "") ? "" : " ") +
            cientos[cientosDeMiles] + (miles > 0 || centenas > 0 || tn > 0 || one < 0 ? (cientosDeMiles == 1 ? "to " : " ") : ""));
    }
    if (miles > 0) {
        res += (((res == "") ? "" : " ") +
            __cf_convert_number(miles) + " mil");
    }
    if (centenas) {
        res += (((res == "") ? "" : " ") +
            cientos[centenas] + (tn > 0 || one > 0 ? (centenas > 1 ? " " : "to ") : ""));
    }


    var ones = Array("", "un", "dos", "tres", "cuatro", "cinco", "seis", "siete", "ocho", "nueve", "diez", "once", "doce", "trece", "catorce", "quince", "dieciseis", "diecisiete", "dieciocho", "diecinueve");
    var tens = Array("", "", "veinte", "treinta", "cuarenta", "cincuenta", "sesenta", "setenta", "ochenta", "noventa");

    if (tn > 0 || one > 0) {
        if (tn < 2) {
            res += ones[tn * 10 + one];
        }
        else {
            if (tn === 2 && one > 0)
                res += "veinti" + ones[one];
            else {
                res += tens[tn];
                if (one > 0) {
                    res += (" y " + ones[one]);
                }
            }
        }
    }

    if (res == "") {
        res = "cero";
    }
    return res.replace("  ", " ");
}

function pad(num, largo, char) {
    char = char || '0';
    num = num + '';
    return num.length >= largo ? num : new Array(largo - num.length + 1).join(char) + num;
}

Result:

num2str(123456789)
"ciento veintitres millones cuatrocientos cincuenta y seis mil setecientos ochenta y nueve pesos (00/100 M.N.)"

Answer 6

Source: http://javascript.about.com/library/bltoword.htm Smallest script that I found:

  <script type="text/javascript" src="toword.js">
    var words = toWords(12345);
    console.log(words);
  </script>

Enjoy!