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hey guys.. i'm trying to make a form for work... we have to do some random math calculation that has to be very precise. say we have a number 2.69456324556356 I need to get that number rounded up to the nearest decimal point.. so it would be 2.69 i've tried to use Math.ceil() but it only will come up with 3 ... which is not what i'm looking for. anyone know what the best way to do this would be? EDIT: infact the whole math query seems to be bollacks lol... can someone convert this equation into javascript? a = 67.50 b = 104 c = b/a d = c rounded up to the nearest decimal point. e = d*(b-1) f = e-d anyone help? lol
Last Edit: Feb 13, 2009 21:02:10 GMT by Llanilek
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1. c = Math.round((b/a)*100)/1002. d = c.toFixed(2)3. Math.roundNumber = function(a,b){
if(!isNaN(parseInt(a))){
c = Math.pow(10,b);
return (Math.round(a*c)/c);
}
return false;
}
d = Math.roundNumber(c,2)
Last Edit: Feb 13, 2009 13:21:27 GMT by crazynarutard
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right i'll try and make sense of that lol... thanks cj lol
Last Edit: Feb 13, 2009 20:17:03 GMT by Llanilek
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i posted 3 possibilities of doing this.
First way is multiplying by 100 than dividing by 100. So if we had a number like:
2.356457843
and we multiplied that by 100, it'd be: 235.6457843
we then round that using Math.round, which would make it: 236
and then we divide it again by 100: 236/100 = 2.36
The second way to do this is using the method toFixed(arg), with arg being how many numbers you want behind the comma =p
The third one I posted is a simple function anyone can make, requires 2 arguments. The number you want to round and by how many decimals.
Use whichever method works for you ^_^
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well u have never lost your touch of explaining things cj thanks again lol
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I'd just have told you to use toFixed... nice thinking CJ. 
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tbh I didn't know about toFixed untill after i wrote 1 and 3, and then used google to find out if there was an easier way
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tbh I didn't know about toFixed untill after i wrote 1 and 3, and then used google to find out if there was an easier way Go read up on toPrecision then too.
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hmmm i dunno if this is a conflict in my code but none of them work lol....
well they do... but well its when you get to higher numbers it doesn't do it lol...
function processForm() {
var type = document.fm.type.value;
var terms = document.fm.terms.value;
var cprice = document.fm.cprice.value;
var iprice = document.fm.iprice.value;
var accept = new Array();
accept[0] = "104";
accept[1] = "156";
accept[2] = "208";
accept[3] = "260";
accept[4] = "312";
Math.roundNumber = function(a,b){
if(!isNaN(parseInt(a))){
c = Math.pow(10,b);
return (Math.round(a*c)/c);
}
return false;
}
// if var type = EXA
if(type == "EXA") {
if(in_array(terms, accept)) {
var repay_multi = terms-1;
var a = iprice/terms;
var b = Math.roundNumber(a,2)
var c = b*repay_multi;
var d = iprice-c;
var output = d;
alert(output);
}
}
}
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it shoould work fine '-' I wonder if it's because of the a,b,c variables in the function and the ones you use for the numbers @.@
Does .toFixed() not work either?
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they all do the same... possible that is effected by the other vars i'll try that n let u no edit: doesn't make any difference
Last Edit: Feb 17, 2009 23:32:59 GMT by Llanilek
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Could you post the form that you're using too? Then we can test it & fix it! ^_^
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lol you're silly.
if(type == "EXA") {
if(in_array(terms, accept)) {
var repay_multi = terms-1;
var e = iprice/terms;
var f = Math.roundNumber(e,2);
alert(f) //gives: xx.xx
var g = f*repay_multi;
//xx.xx*repay_multi = xx.xxxxxxxxxxxxxxxx
var d = iprice-g;
var output = d;
lert(output);
}
}
see comments, hope you get what i mean.
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bingo lol cheers cj
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