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javascriptnumber-formatting

Format JavaScript numbers to trim zeroes and have commas

Here's what I need:

121 => 121
14231.439400000 => 14,231.4394
1.123456789 => 1.12345679
-9012.4430001 => -9,012.4430001

I've tried the following: return input.toFixed(8).toLocaleString().replace(/0*$/, '').replace(/\.$/, '');

and that doesn't add commas. I've also looked at numeraljs, but that doesn't have the decimal features I require (specifying up to 8 decimals out, or trimming)

Any help?

Solution

  • This should work on any browser that supports locales and the options described on MDN:

    return input.toLocaleString("en", { 
    useGrouping: true, 
    maximumFractionDigits: 8 
});

    Demonstration

    And here's an alternative solution adapted from Elias Zamaria's answer here:

    var x = input.toFixed(8).split('.');
return x[0].replace(/\B(?=(\d{3})+(?!\d))/, ',') + 
       ('.' + x[1]).replace(/\.?0+$/, '');

    Demonstration