gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
using Umbraco.Core.Logging;
using Umbraco.Web.WebApi;
using SomeNS.Umbraco.Extensions.Models;

namespace SomeNS.Umbraco.Extensions.Controllers
{
    public class LocationsController : UmbracoApiController
    {
        [HttpGet]
        public object LocationsById(string locationIds)
        {
            var locations = new List<MapLocationModel>();
            var ids = locationIds.Split(new [] { "," }, StringSplitOptions.RemoveEmptyEntries);

            foreach (var id in ids)
            {
                var content = Umbraco.TypedContent(id);

                if (content != null && content.DocumentTypeAlias == "LocationPage")
                {
                    locations.Add(new MapLocationModel(content));
                }
            }

            return locations;
        }
    }
}