- Part of the Number object, JavaScript's toFixed() method returns string-formatted integers and floating points. Without argument, you get a number rounded to the nearest whole number:
var num = 5.3;
// Without arguments, will round to whole numbers:
alert( num.toFixed() ); // Rounded down
num = 7.5;
alert( num.toFixed() ); // Rounded up - But it is most useful to display a certain precision for numbers after the period: the integer you pass as argument determines how many digits will be displayed after the decimal point. Use "2" to show prices in dollars and cents (and other currencies), including unnecessary zeros:
var num = 5.785;
alert( num.toFixed(2) ); // 5.79
num = 3.4;
alert( num.toFixed(2) ); // 3.40 - show an extra zero at the end!Caveat: remember that what you get back is a string. If you re-use variables, make sure to explicitly convert back to integer or float by using parseInt() or parseFloat() methods.
- JavaScript will accept an argument between zero (same as passing no argument) and 20. Just remember that this argument is the same as the number of digits shown after the period.
Tip: since toFixed() only affects the "mantissa" (digits on the right of the decimal point), you'll need to write a custom function to pad extra zeros in front of the integer part of numbers.
- The PHP equivalent to JavaScript's toFixed() method is the number_format() function:
$num = 5.1;
echo number_format( $num, 2 ) . '<br>'; // 5.10
echo number_format( 3, 2 ) . '<br>'; // 3.00
// European notation, with comma for decimal and space to separate thousands:
echo number_format( 12345, 2, ',', ' ' ); // 12 345,00
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