2 Decimal places!!!! 2

[TrueJoker]

I ahve set up some calculations using javascript code, but to my horror it displays way too many decimal places, how can i resrict the calculations result to 2 decimal places?

This is the snippet of code i am using!

function dm(amount) 
{
  string = "" + amount;
  dec = string.length - string.indexOf('.');
  if (string.indexOf('.') == -1)
  return string + '.00';
  if (dec == 1)
  return string + '00';
  if (dec == 2)
  return string + '0';
  if (dec > 3)
  return string.substring(0,string.length-dec+3);
  return string;
}

incvat = vat + subtotal;
	document.form1.incvat.value = dm(eval(incvat));

The calculation is made up of a subtotal with the VAT being added onto it. Some results do only display 2 decimal places but more often than not it displays recuring decimal places!

Thanx in advance for any help!

 

[nickdel]

TrueJoker, use this:

incvat.toFixed(2);

Cheers

Nick

 

[TrueJoker]

sorry to be a noob but where would i implement it?

 

[nickdel]

Another way you for working with decimals is to use the toPrecision method. Here's an example of both for future ref:

var MyNum = 501.2347;
var result;

//Using toFixed
result = MyNum.toFixed(2); //result 501.23

//Using toPrecision
result = MyNum.toPrecision(4); // result 501.2

Nick

 

[nickdel]

TJ, I'm assuming your function dm is just to handle the decimal. Since you no longer need this then just put it here:

incvat = vat + subtotal;
document.form1.incvat.value = incvat.toFixed(2);

Nick

 

[TrueJoker]

it doesnt ahve any affect on the calculations when i try it! Do i have to specify the toFixed option as anything for it to work?

 

[nickdel]

TJ, it should work just fine. Here's an example but can you also post your most up to date code?

var vat = 91.565;
var subtotal = 523.23;
var incvat;

incvat = eval(vat + subtotal);

document.write (incvat.toFixed(2));

Rememebr JS is case sensitive so if you have tofixed for example, it will not work.

Nick

 

[trollacious]

Skip the eval, just add the 2 values together.

Lee

 

[TrueJoker]

I changed the calculation like you showed me before

incvat = vat + subtotal;
	document.form1.incvat.value = incvat.toFixed(2);

But there was no reaction, the calculation still worked but it still returned a recuring answer. I was just curious if i had to assign or define toFixed as anything?

 

[trollacious]

Show us the code you have now, including the form.

Lee

 

[TrueJoker]

I have managed to find a piece of code which seems to work, i was reading through some tutorials and foudn ti in one of them!

incvat = Math.round((vat + subtotal) * 100)/100;
	document.form1.incvat.value = dm(eval(incvat));

The only issue is that if the result is £10.50 or any decimal with a 0 on the end etc then it displays it as £10.5 but i can live with it lol

Thanx for your help Appreciate it all

 

[trollacious]

I have had NO problem using toFixed(). Just tried it and it worked fine.

var amount = 10.5;
document.write(amount.toFixed(2));

Lee

 

[kaht]

Lee is correct - toFixed will always add the appropriate amount of 0s defined by the parameter you pass to the method.

-kaht

Lisa, if you don't like your job you don't strike. You just go in every day and do it really half-assed. That's the American way. - Homer Simpson
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[tsuji]

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