CODEWITHSUNDEEP
javascriptgoogle-maps-api-3
Richard Parker
Richard Parker

Reputation: 70

Javascript Distance Calculation Returns NaN

I have a function to calculate the distance between two sets of latitude and longitude coordinates I get from the Google Maps API

Here is the calculate distance function:

function getDistance(lat1, lon1, lat2, lon2) {

    var lat1p = parseFloat(lat1);
    var lon1p = parseFloat(lon1);
    var lat2p = parseFloat(lat2);
    var lon2p = parseFloat(lon2);

    var R = 6371; // km (change this constant to get miles)
    var dLat = (lat2p-lat1p) * Math.PI / 180;
    var dLon = (lon2p-lon1p) * Math.PI / 180;
    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.cos(lat1 * Math.PI / 180 ) * Math.cos(lat2 * Math.PI / 180 ) *
        Math.sin(dLon/2) * Math.sin(dLon/2);
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
    var d = R * c;
    if (d>1) return Math.round(d)+"km";
    else if (d<=1) return Math.round(d*1000)+"m";

    return d;
}

I believe all the coordinates are considered Float types I'm not 100% sure but when I have it print or alert what the distance is it returns NaN.... Is there a way to do this. I'm trying to stray away from the Google Maps API to calculate distance because that would make everything harder because I would essentially have to start over.

Upvotes: 0

Views: 851

Answers (1)

Richard Parker
Richard Parker

Reputation: 70

I'm sorry I fixed it I was double declaring variables as well as I had a . instead of a , when I called the distance function. Thank you guys for your suggestions they led me to figure it out.

Upvotes: 1

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