angular-google-maps center zoom multiple markers - angularjs

Question

I'm using AngularJS for Google Maps and want to dynamically center and zoom a map based on multiple markers that are dynamically loaded. This is for a Cordova app using the Ionic Framework.
Here's my view:
<ion-view title="" ng-controller="MapCtrl as vm">
<ion-content class="padding">
<google-map id="mainMap" control="vm.googleMap" draggable="true" center="vm.map.center" zoom="vm.map.zoom" mark-click="false">
<markers idKey="mainMap" fit="vm.map.fit">
<marker idKey="marker.id" ng-repeat="marker in vm.map.markers" coords="marker.coords" options="marker.options">
<marker-label content="marker.name" anchor="2 0" class="marker-labels"/>
</marker>
</markers>
</google-map>
</ion-content>
</ion-view>
Here's my controller:
angular.module('myApp.controllers', [])
.controller('MapCtrl', function($scope, $ionicPlatform) {
var vm = this;
vm.googleMap = {}; // this is filled when google map is initialized, but it's too late
vm.mapMarkers = [];
vm.arrMarkers = [
{
id: "home",
name: "home",
coords: {
latitude:xxxxxxx, //valid coords
longitude:xxxxxxx //valid coords
},
options: {
animation: google.maps.Animation.BOUNCE
}
},
{
id: "placeAId",
name: "Place A",
coords: {
latitude:xxxxxxx, //valid coords
longitude:xxxxxxx //valid coords
}
},
{
id: "placeBId",
name: "Place B",
coords: {
latitude:xxxxxxx, //valid coords
longitude:xxxxxxx //valid coords
}
}
];
vm.map = {
center: { //how to determine where to center???
latitude: xxxxxxx, //valid coords
longitude: xxxxxxx //valid coords
},
zoom: 12, //how to determine zoom dynamically???
fit: true,
markers: vm.arrMarkers
};
var setMapBounds = function () {
var bounds = new google.maps.LatLngBounds();
createMarkers();
var markers = vm.mapMarkers;
for(var i=0; i<markers.length; i++) {
bounds.extend(markers[i].getPosition());
}
var map = vm.googleMap.control.getGMap();
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
//remove one zoom level to ensure no marker is on the edge.
map.setZoom(map.getZoom()-1);
// set a minimum zoom
// if you got only 1 marker or all markers are on the same address map will be zoomed too much.
if(map.getZoom()> 15){
map.setZoom(15);
}
};
var createMarkers = function() {
var map = vm.googleMap.control.getGMap(); //vm.googleMap.control is undefined because this fire before map is initialized
angular.forEach(vm.restaurants, function(restaurant, index) {
var marker = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(restaurant.coords.latitude, restaurant.coords.longitude),
title: restaurant.name
});
vm.mapMarkers.push(marker);
});
};
$ionicPlatform.ready(function() {
setMapBounds();
});
})
So, my question is how do I center and zoom the map using multiple dynamically loaded markers? Also, how do I get an instance of googleMap.control (vm.googleMap.control) before the map is loaded?

Answer 1

Here's my code just in case anyone was wondering how to do this locally. This is a simple solution for what I needed and my indeed go back to angualr-google maps, but as of now this works fine in my application.
angular.module('myApp.controllers', [])
.controller('MapCtrl', function($scope) {
var vm = this;
vm.googleMap = null;
vm.mapMarkers = [];
var onSuccess = function(position) {
vm.userLocation.coords.latitude = position.coords.latitude;
vm.userLocation.coords.longitude = position.coords.longitude;
initializeMap();
};
var onError = function(error) {
alert('code: ' + error.code + '\n' + 'message: ' + error.message);
};
vm.userLocation = {
id: "home",
title: "home",
coords: {
latitude: 33.636727,
longitude: -83.920702
},
options: {
animation: google.maps.Animation.BOUNCE
}
};
vm.places = [
{
id: "78869C43-C694-40A5-97A0-5E709AA6CE51",
title: "Place A",
coords: {
latitude: 33.625296,
longitude: -83.976206
}
},
{
id: "52319278-83AA-46D4-ABA6-307EAF820E77",
title: "Place B",
coords: {
latitude: 33.576522,
longitude: -83.964981
}
}
];
var addMarkers = function() {
var userLocation = new google.maps.Marker({
map: vm.googleMap,
position: new google.maps.LatLng(vm.userLocation.coords.latitude, vm.userLocation.coords.longitude),
//animation: vm.userLocation.options.animation,
title: vm.userLocation.title
});
vm.mapMarkers.push(userLocation);
angular.forEach(vm.places, function(location, index) {
var marker = new google.maps.Marker({
map: vm.googleMap,
position: new google.maps.LatLng(location.coords.latitude, location.coords.longitude),
title: location.title
});
vm.mapMarkers.push(marker);
});
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < vm.mapMarkers.length; i++) {
bounds.extend(vm.mapMarkers[i].getPosition());
}
vm.googleMap.setCenter(bounds.getCenter());
vm.googleMap.fitBounds(bounds);
//remove one zoom level to ensure no marker is on the edge.
vm.googleMap.setZoom(vm.googleMap.getZoom() - 1);
// set a minimum zoom
// if you got only 1 marker or all markers are on the same address map will be zoomed too much.
if (vm.googleMap.getZoom() > 15) {
vm.googleMap.setZoom(15);
}
};
var initializeMap = function() {
var mapOptions = {
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoom: 12,
center: new google.maps.LatLng(vm.userLocation.coords.latitude, vm.userLocation.coords.longitude)
};
var div = document.getElementById("map_canvas");
//var map = plugin.google.maps.Map.getMap(div, mapOptions);
vm.googleMap = new google.maps.Map(div, mapOptions);
addMarkers();
var width = screen.width;
var height = screen.height;
};
navigator.geolocation.getCurrentPosition(onSuccess, onError);
})

Answer 2

Your previous answer is good but doesn't include usage of the google maps directives you mentioned in the begining of the post. There is a way to do it using those directives, here is how:
Assuming we are in the directive's scope
Define scope.mapControl = {}; - this will have new access methods for map and markers
When defining your markup for the directives - for map and marker - include this control attribute to be added:
<ui-gmap-google-map center='map.center' zoom='map.zoom' control="mapControl">
<ui-gmap-marker ng-repeat="location in locations" coords="location.coordinates" options="location.markerOptions" idkey="location.id" control="mapControl">
<ui-gmap-window options="location.markerWindowOptions" closeclick="closeMarkerWindow(location.id)" show="true">
<div>{{location.description}}</div>
</ui-gmap-window>
</ui-gmap-marker>
</ui-gmap-google-map>
In your directive's event or some method:
var map = scope.mapControl.getGMap();
var markers = scope.mapControl.getGMarkers();
var bounds = map.getBounds();
for (var i = 0; i < markers.length; i++) {
bounds.extend(markers[i].getPosition());
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
map.setZoom(map.getZoom() - 1);