Route Via Intermediate Waypoint - Passing a list of coordinates in via parameter

I need to pass a list of coordinates within parameters in via parameter, but i don't find the way. This is an example with only one pair of coordinates(lat, lng):

function calculateRoute (platform) {
  var router = platform.getRoutingService(null, 8),
    routeRequestParams = {
      routingMode: 'fast',
      transportMode: 'truck',
      origin: '36.87689,-2.44138',
      destination: '36.69630,-4.47968',
      via: '38.99112,-1.86902', //LIST HERE!!!
      return: 'polyline'
    };

  router.calculateRoute(
    routeRequestParams,
    onSuccessRoute,
    onError
  );
}

The url I'm hoping to get is like this:

https://router.hereapi.com/v8/routes?apikey=
{API_KEY}&routingMode=fast&transportMode=truck&origin=36.87689,-2.44138&via=38.99112,-1.86902&via=37.95862,-1.15538&destination=36.69630,-4.47968&return=polyline

As you can see via is repeat in the URL.

Many thanks!

Solution

The JavaScript API does not (yet) support multiple routing waypoints with regards to the Routing v8 API, meaning, it does not support passing a list of coordinates to the via parameter.

So your best bet is to target the Routing v8 REST API directly, like follow, and build a polyline out of the response:

# Note: line breaks and spaces are for readability only (they need to be removed)

https://router.hereapi.com/v8/routes?
  origin=52.550464,13.384223
  &transportMode=car
  &destination=52.477545,13.447395
  &via=52.529791,13.401389
  &via=52.513079,13.424392
  &via=52.487581,13.425079
  &apikey={YOUR_API_KEY}