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Rounding a number to one decimal place in javascript

Possible duplicate:
How do you get around to 1 decimal place in Javascript?

The following code displays the total distance traveled for a specific route displayed on google maps. I managed to count the number from kilometers to miles. Here is the code for the function:

function computeTotalDistance(result) {
        var total = 0;
        var myroute = result.routes[0];
        for (i = 0; i < myroute.legs.length; i++) {
          total += myroute.legs[i].distance.value;
        }
        total = total *0.621371/ 1000.
        document.getElementById('total').innerHTML = total + ' mi';

The total is displayed as 41.76483039399999 mi

. How would you round total

to one decimal place?

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4 answers


Use toFixed

:

var total = 41.76483039399999;
total = total.toFixed(1) // 41.8


Here's a fiddle: http://jsfiddle.net/VsLp6/

+10


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Math.round(total * 10) / 10


The result is a number. toFixed () gives a string as described in other answers.

+11


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You are looking for Number.prototype.toFixed

;41.76483039399999.toFixed(1) === "41.8"; 

function computeTotalDistance(result) {
    var total = 0, myroute = result.routes[0];
    for (i = 0; i < myroute.legs.length; i++) {
        total += myroute.legs[i].distance.value;
    }
    total = (total * 0.621371 / 1000).toFixed(1);
    document.getElementById('total').innerHTML = total + ' mi';
}

There are many other ways to achieve this, for example without using any methods from Math

or instancesNumber 

(~~(10 * total) + (~~(100 * total) % 10 >= 5))/10 + '' // "41.8"
// (      417   +     (6 >= 5)               )/10 = 41.8
+1


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There is a function to do what you want:

var total = 41.76483039399999; print (x.toFixed (2));

It will print 41.76

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