Question

Decimal to Fraction Conversion in JavaScript or ColdFusion

Asked by: jasonforwork

I need a cut and paste function to convert an existing value that is stored as a decimal to display as a fraction, rounding to the nearest 1/16.  I.E., if I have a value of .062 or .0625 or something close, I want to display 1/16 to the user.  The application this is for is written in ColdFusion with client side javascript.  I would prefer the function to be in JavaScript, but if someone already has one written in ColdFusion, that's cool too.  If anyone needs any more info, please let me know.  Thank you.

Jason

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Asked On
2003-08-05 at 12:42:49ID20700629
Tags

decimal

,

fraction

,

javascript

Topics

Miscellaneous Web Development

,

ColdFusion Studio

Participating Experts
2
Points
250
Comments
6

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Answers

 

by: rolftollerudPosted on 2003-08-05 at 13:18:14ID: 9083422

Found this at this location: http://www.csgnetwork.com/decimal2fractwecalc.html
Should at least help you on the way.

<SCRIPT language=JavaScript>

<!--
function decfrac()
{
 var form = window.document.decform;
 var dec = form.dec.value;
 var decString = dec.toString();
 var dslength = decString.length - 1;
 var div = 1;
 // Multiply by powers of 10 to remove the decimal
 for (i=0; i<dslength; i++)
 {
  dec = dec * 10;
  div = div * 10;
 }
 // Factor out the GCF of the two numbers
 for (i=2; i <= dec; i++) {
      while ((mod(dec,i) == 0) && (mod(div,i) == 0))
      {
          dec = dec/i;
            div = div/i;
      }
 }
 // Display the two numbers in the fraction form boxes and in the verification form.
 form.numerator.value = dec;
 form.denominator.value = div;
 window.document.calc.t.value = dec; // insert below
 window.document.calc.b.value = div; // insert below
}
 
function mod(n, m)
{
      while (n >= m)
      {
            n = n-m;
      }
      return(n);
      /*Keeps subtracting the number you want to divide by until the remainder is less than the original divisor, and then returning the remainder.
      */
}

function fracdec()
{
      var t = window.document.calc.t.value; // numerator
      var b = window.document.calc.b.value; // denominator
      var dec = t / b; // calculation
      window.document.calc.decimal.value = dec; // value

      /*Verifies the upper calculator as it best can. On works on terminating fractions. It approximates the others.
      */
}

//-->
</SCRIPT>

 

by: jasonforworkPosted on 2003-08-05 at 13:28:35ID: 9083513

Thanks, but that doesn't round to the nearest 1/16.  I need the function to round to the neartest 1/16th.

 

by: amit_gPosted on 2003-08-05 at 16:04:11ID: 9084658

Try this ...

<script language="javascript">
var Num = 1, Den = 16;
var RoundTo = 0.0625;

var Number = 0.6;

function ReduceNumDen()
{
      var i;

      for (i = 2 ; i <= Den ; i++)
      {
            while (((Den % i) == 0) && ((Num % i) == 0))
            {
                  Den /= i;
                  Num /= i;
            }
      }
}

function CalculateFractions(Number, RoundTo)
{
      var Multiplier = 1;

      if (Number < RoundTo)
      {
            alert("Error");
            return;
      }

      while (Multiplier * RoundTo < Number)
      {
            Multiplier++;
      }

      if (Multiplier * RoundTo > Number)
      {
            if (Math.abs(Multiplier * RoundTo - Number) > Math.abs((Multiplier - 1) * RoundTo - Number))
            {
                  Multiplier--;
            }
      }

      Num *= Multiplier;

      ReduceNumDen();
}

CalculateFractions(Number, RoundTo);

alert(Num + "/" + Den);
</script>

 

by: jasonforworkPosted on 2003-08-06 at 08:17:48ID: 9091881

I just reviewed the problem, and since my values are query values, I will need a CFScript function instead.  I am having trouble passing in my #FieldNames# output to the javascript function.

 

by: jasonforworkPosted on 2003-08-07 at 08:15:37ID: 9100584

I actually found a coldfusion custom tag that does the trick, cf_fraction.  Thanks for the input.  I will split points between the two who gave me the code.  Thanks again.

20120131-EE-VQP-002

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