map.js

// This example adds a search box to a map, using the Google Place Autocomplete
// feature. People can enter geographical searches. The search box will return a
// pick list containing a mix of places and predicted search terms.

// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">
var markers = [];
function initAutocomplete() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 37.404001, lng: -122.034976},
    zoom: 9,
    mapTypeId: 'roadmap'
  });

  // Create the search box and link it to the UI element.
  var input = document.getElementById('pac-input');
  var searchBox = new google.maps.places.SearchBox(input);
  map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

  var input2 = document.getElementById('pac-input2');
  //var searchBox = new google.maps.places.SearchBox(input2);
  map.controls[google.maps.ControlPosition.TOP_LEFT].push(input2);

  var input3 = document.getElementById('pac-input3');
  //var searchBox = new google.maps.places.SearchBox(input3);
  map.controls[google.maps.ControlPosition.TOP_LEFT].push(input3);

  // Bias the SearchBox results towards current map's viewport.
  map.addListener('bounds_changed', function() {
    searchBox.setBounds(map.getBounds());
  });


  // Listen for the event fired when the user selects a prediction and retrieve
  // more details for that place.
  searchBox.addListener('places_changed', function() {
    var places = searchBox.getPlaces();

    if (places.length == 0) {
      return;
    }

  // Clear out the old markers.
  //markers.forEach(function(marker) {
  //   marker.setMap(null);
  //  });

    // For each place, get the icon, name and location.
    var bounds = new google.maps.LatLngBounds();
    places.forEach(function(place) {
      if (!place.geometry) {
        console.log("Returned place contains no geometry");
        return;
      }
      var icon = {
        url: place.icon,
        size: new google.maps.Size(71, 71),
        origin: new google.maps.Point(0, 0),
        anchor: new google.maps.Point(17, 34),
        scaledSize: new google.maps.Size(25, 25)
      };

      // Create a marker for each place.
      markers.push(new google.maps.Marker({
        map: map,
        icon: icon,
        title: place.name,
        position: place.geometry.location
      }));
      console.log("markers: " + markers)
      if (place.geometry.viewport) {
        // Only geocodes have viewport.
        bounds.union(place.geometry.viewport);
      } else {
        bounds.extend(place.geometry.location);
      }
    });
    map.fitBounds(bounds);
  });
}

function middle() {
  var totalLat =0;
  var totalLng =0;
  for (var i=0;i < markers.length; i +=1){
    var newlat=markers[i].getPosition().lat();
    console.log(markers[i].getPosition().lat())
    totalLat = totalLat+ newlat;

    console.log("for loop: " + i + " lat: "+totalLat);

    totalLng += markers[i].getPosition().lng();
    console.log("for loop: " + i + " lng: "+totalLng);
  }
  var latAvg = totalLat/markers.length;
  var lngAvg = totalLng/markers.length;
  //console.log("position: " + markers[0]["position"]);
  //console.log("position: " + markers[0]["position"][0]);
  console.log("lngAvg= " + lngAvg);
  console.log("totalLng= " + totalLng );
  console.log("latgAvg= " + latAvg);
  console.log("totalLat= " + totalLat );
  console.log(latAvg + ", " + lngAvg);
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 37.404001, lng: -122.034976},
    zoom: 13,
    mapTypeId: 'roadmap'
  });

  var middleMarker = new google.maps.Marker({
        position: {lat: latAvg, lng: lngAvg},
        map: map,
        icon: 'marker.png',
      });
}

function clearPage() {
       window.location.reload();
  }


     var map;

     function initMap() {
       // Create the map.
       var pyrmont = {lat: -33.866, lng: 151.196};
       map = new google.maps.Map(document.getElementById('map'), {
         center: pyrmont,
         zoom: 17
       });

       // Create the places service.
       var service = new google.maps.places.PlacesService(map);
       var getNextPage = null;
       var moreButton = document.getElementById('more');
       moreButton.onclick = function() {
         moreButton.disabled = true;
         if (getNextPage) getNextPage();
       };

       // Perform a nearby search.
       service.nearbySearch(
           {location: pyrmont, radius: 500, type: ['store']},
           function(results, status, pagination) {
             if (status !== 'OK') return;

             createMarkers(results);
             moreButton.disabled = !pagination.hasNextPage;
             getNextPage = pagination.hasNextPage && function() {
               pagination.nextPage();
             };
           });
     }

     function createMarkers(places) {
       var bounds = new google.maps.LatLngBounds();
       var placesList = document.getElementById('places');

       for (var i = 0, place; place = places[i]; i++) {
         var image = {
           url: place.icon,
           size: new google.maps.Size(71, 71),
           origin: new google.maps.Point(0, 0),
           anchor: new google.maps.Point(17, 34),
           scaledSize: new google.maps.Size(25, 25)
         };

         var marker = new google.maps.Marker({
           map: map,
           icon: image,
           title: place.name,
           position: place.geometry.location
         });

         var li = document.createElement('li');
         li.textContent = place.name;
         placesList.appendChild(li);

         bounds.extend(place.geometry.location);
       }
       map.fitBounds(bounds);
     }