Round output in javascript

Question

I am working on a calculator and would like it to round to about 5 decimal places. Here is my javascript code to get an inout and produce the output:

        <div class="input"> 
        Price paid per share: <input id="value1" type="text" /><br>
        Number of shares bought: <input id="value2" type="text" /><br>
        Commission/ fee's paid: <input id="value3" type="text" /><br>
        <center><input type="submit" class="submit"  onclick="output();"></center>  
    </div>
    <center><p class="result" id="result"> </p></center>

    <script type="text/javascript" language="javascript" charset="utf-8">
   function output(){
       var value1 = document.getElementById('value1').value;
       var value2 = document.getElementById('value2').value;
       var value3 = document.getElementById('value3').value; 
       document.getElementById('result').innerHTML = ((parseFloat(value1) * parseFloat(value2)) + (parseFloat(value3))) / (parseFloat(value2));
    }

Anyone know how I could round my output/ results to about 5 decimal places? Thanks.

There's likely no reason to `parseFloat()`, and likely good reasons not to. Note that `"4" * "3" == 12` — Phrogz, Feb 15 '14 at 06:05

score 3 · Answer 1 · answered Feb 15 '14 at 05:59

3

var num=4.5960797;
var n=num.toFixed(5);

answered Feb 15 '14 at 05:59

SFIntegrator

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score 2 · Answer 2 · answered Feb 15 '14 at 05:57

2

Try using toFixed:

var result = ((parseFloat(value1) * parseFloat(value2)) + (parseFloat(value3))) / (parseFloat(value2));
document.getElementById('result').innerHTML = result.toFixed(5);

answered Feb 15 '14 at 05:57

p.s.w.g

146,324
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score 0 · Answer 3 · answered Feb 15 '14 at 05:57

0

Use Math.round(num * 100000) / 100000

answered Feb 15 '14 at 05:57

Akshat Singhal

1,801
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This leaves the result as a number, and not a string, where floating point representations may later cause the string representation to be incorrect. Further, a value like `1` will show as `1` instead of `1.00000`. – Phrogz Feb 15 '14 at 06:04

score 0 · Answer 4 · answered Feb 15 '14 at 05:57

0

var result=Math.round(yourValue*100000)/100000

answered Feb 15 '14 at 05:57

ltalhouarne

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This leaves the result as a number, and not a string, where floating point representations may later cause the string representation to be incorrect. Further, a value like `1` will show as `1` instead of `1.00000`. – Phrogz Feb 15 '14 at 06:03

Round output in javascript

4 Answers4