Comments on: Javascript Round Number function http://blog.insicdesigns.com/2008/02/javascript-number-function/ Web Development and Design Blog Wed, 11 Jan 2012 03:33:44 +0000 hourly 1 http://wordpress.org/?v= By: ger http://blog.insicdesigns.com/2008/02/javascript-number-function/#comment-3797 ger Tue, 05 May 2009 08:29:41 +0000 http://ninware.com/javascript-number-function#comment-3797 Actualy  there are many cases when we do not want pure math round for prices, as 1st: prices should be always rounded up ;)  (e.g.  $4.021 => $4.05) 2nd: usually round to 5 cents (unless you have those stuppid 9.99 prices) So, we get wierd price like $4.3126 after some calculation (item price + some delivery + WAT * % discount bla-bla-bla) and need to get nice-looking price like $4.35 function roundPrice(price) {          var priceMultiplied = Math.ceil(price*100); var reminder = priceMultiplied % 5; var compliment = reminder?5-reminder:0; var priceRounded = (priceMultiplied + compliment)/100; return priceRounded.toFixed(2); } test cases: roundPrice(18.32)   = 18.35 roundPrice(20.01)   = 20.05 roundPrice(21.39)   = 21.40 roundPrice(29.95)   = 29.95 roundPrice(29.96)   = 30.00 roundPrice(29.951) = 30.00 Actualy  there are many cases when we do not want pure math round for prices, as
1st: prices should be always rounded up ;)   (e.g.  $4.021 => $4.05)
2nd: usually round to 5 cents (unless you have those stuppid 9.99 prices)

So, we get wierd price like $4.3126 after some calculation (item price + some delivery + WAT * % discount bla-bla-bla) and need to get nice-looking price like $4.35

function roundPrice(price)
{         
var priceMultiplied = Math.ceil(price*100);
var reminder = priceMultiplied % 5;
var compliment = reminder?5-reminder:0;
var priceRounded = (priceMultiplied + compliment)/100;
return priceRounded.toFixed(2);
}

test cases:
roundPrice(18.32)   = 18.35
roundPrice(20.01)   = 20.05
roundPrice(21.39)   = 21.40
roundPrice(29.95)   = 29.95
roundPrice(29.96)   = 30.00
roundPrice(29.951) = 30.00

]]> By: insic_19 http://blog.insicdesigns.com/2008/02/javascript-number-function/#comment-42 insic_19 Wed, 13 Aug 2008 04:39:02 +0000 http://ninware.com/javascript-number-function#comment-42 that is a nice idea also. thanks for the tip brian. that is a nice idea also. thanks for the tip brian.

]]> By: Brian McAllister http://blog.insicdesigns.com/2008/02/javascript-number-function/#comment-41 Brian McAllister Tue, 12 Aug 2008 14:45:48 +0000 http://ninware.com/javascript-number-function#comment-41 why not use the toFixed method? It also rounds the result i.e. var number = 3.14567 alert(number.toFixed(2)); ==> 3.15 why not use the toFixed method? It also rounds the result i.e.

var number = 3.14567
alert(number.toFixed(2));

==> 3.15

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