How to Reliably Format Numbers to Always Show Two Decimal Places in JavaScript?

Format Number to Always Display 2 Decimal Places

The given task involves converting numbers to a format that consistently displays two decimal places, rounding them if necessary. While the approach of using parseFloat(num).toFixed(2) can achieve basic conversion, it falls short when dealing with integers.

Improved Solution:

To address this issue, a more robust solution can be employed:

(Math.round(num * 100) / 100).toFixed(2);

Explanation:

1. Math.round(num * 100): Multiplies the number by 100 and rounds it to the nearest integer. This effectively converts the number to a string with two decimal places, even for integers.
2. (Math.round(num * 100) / 100): Divides the result by 100 to restore the original scale of the number.
3. .toFixed(2): Truncates the result to two decimal places, rounding where necessary.

Example:

var num1 = "1";
var num2 = "1.341";
var num3 = "1.345";

document.getElementById('num1').innerHTML = (Math.round(num1 * 100) / 100).toFixed(2);
document.getElementById('num2').innerHTML = (Math.round(num2 * 100) / 100).toFixed(2);
document.getElementById('num3').innerHTML = (Math.round(num3 * 100) / 100).toFixed(2);

Output:

<span>

The above is the detailed content of How to Reliably Format Numbers to Always Show Two Decimal Places in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!