CODEWITHSUNDEEP
javascriptdecimalformat
FearghalK
FearghalK

Reputation: 3

Javascript - Return two decimal place value after multiplying a number

OK, I'm a novice at this but keen so help appreciated.

I have the following script that looks at field q13 which is a value and may or may not contain two decimal places. I then use the value returned and multiply by .8 to give 80% which I want to display in field q14. This works fine but decimal places can 1, 2, 3 etc. How do I ensure that I always return 2 decimal places? Rounding is not absolutely necessary.

function parseNumber(n) // Define a new function
{
    var f = parseFloat(n); // Convert to float number.
    return isNaN(f) ? 0 : f; // Treat invalid input as 0;
}

$("#Field13").on("change",function() {
    var x = parseNumber($("#q13 input").val());
    var y = x * 0.8;
    $("#q14 input").val(y);
});

Upvotes: 0

Views: 74

Answers (2)

taxicala
taxicala

Reputation: 21759

use toFixed passing a number of decimals you want to have:

function parseNumber(n) // Define a new function
{
    var f = parseFloat(n); // Convert to float number.
    return isNaN(f) ? 0 : f; // Treat invalid input as 0;
}

$("#Field13").on("change",function() {
    var x = parseNumber($("#q13 input").val());
    var y = x * 0.8;
    $("#q14 input").val(y.toFixed(2));
});

Upvotes: 1

Pranav C Balan
Pranav C Balan

Reputation: 115212

Use toFixed() to specify number of digits to appear after the decimal point

$("#q14 input").val(y.toFixed(2));

Upvotes: 3

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