calculate distance between 2 points using Javascript API in IONIC 2

Question

I want to get the current position of the user and calculate the distance between this position and others positions. I am using this tutorial : Create a Nearby Places List with Google Maps in Ionic 2. This is the code:

let usersLocation;
Geolocation.getCurrentPosition().then((position) => {

   usersLocation = { lat :position.coords.latitude ,  lng : position.coords.longitude }
   locations.map((location) => {

    let placeLocation = {
      lat: location.latitude,
      lng: location.longitude
    };

    location.distance = this.getDistanceBetweenPoints(
        usersLocation,
        placeLocation,
        'miles'
    ).toFixed(2);
  });

});

The problem is : The usersLocation variable is not set with the latitude and the longitude of the current user's postion. Can you help me!!

Your .then function is only used when successful outcome of calling getCurrentPosition. You should have a good way to catch errors, using error function: developers.google.com/web/fundamentals/getting-started/primers/…. The error function will help you determine what failure may be happening when calling getCurrentPosition(). I bet your getting an error from calling getCurrentPosition() and are eating it. — Steve Kennedy
– Steve Kennedy, Commented Mar 10, 2017 at 17:52
I used the method indicated in the link above , but it does not enter in the 2 cases success or error. I am calling the function getCurrentPosition() in another provider and it work fine. — mehdi
– mehdi, Commented Mar 10, 2017 at 18:18
Does your config.xml have feature allowing permissions for gps — Steve Kennedy
– Steve Kennedy, Commented Mar 10, 2017 at 18:49
Make sure you've followed cordova.apache.org/docs/en/latest/reference/… to enable using gps. — Steve Kennedy
– Steve Kennedy, Commented Mar 10, 2017 at 18:56

illya yurkevich · Accepted Answer · 2017-06-28 08:00:58Z

13

calculateDistance(lat1:number,lat2:number,long1:number,long2:number){
    let p = 0.017453292519943295;    // Math.PI / 180
    let c = Math.cos;
    let a = 0.5 - c((lat1-lat2) * p) / 2 + c(lat2 * p) *c((lat1) * p) * (1 - c(((long1- long2) * p))) / 2;
    let dis = (12742 * Math.asin(Math.sqrt(a))); // 2 * R; R = 6371 km
    return dis;
  }

answered Jun 28, 2017 at 8:00

illya yurkevich

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2 Comments

Esaith Over a year ago

Yes. Multiply by 0.621371 to convert into miles.

PhpCoder Over a year ago

So, if I divide "dis" by 1000, I get value in meters, right?

Biranchi · Accepted Answer · 2017-06-10 12:02:09Z

0

Try google DirectionsService:

https://developers.google.com/maps/documentation/javascript/directions

Scroll to the end of the page, the last example calculates the distance between the points.

answered Jun 10, 2017 at 12:02

Biranchi

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