Wrapped "open" in promise

In case you want to open an info window and the template is not yet done
loading it will wait for the template to be loaded first. I don't think
it will happen often, but better be safe than sorry.

Author: Harm van der Werf

directives/info-window.js

@@ -78,7 +78,7 @@
        * it must have a container element with ng-non-bindable
        */
       var template;
-      $q(function(resolve) {
+      var templatePromise = $q(function(resolve) {
         if (angular.isString(element)) {
           $templateRequest(element).then(function (requestedTemplate) {
             resolve(angular.element(requestedTemplate).wrap('<div>').parent());
@@ -98,21 +98,23 @@
       });
 
       infoWindow.__open = function(map, scope, anchor) {
-        $timeout(function() {
-          anchor && (scope.anchor = anchor);
-          var el = $compile(infoWindow.__template)(scope);
-          infoWindow.setContent(el[0]);
-          scope.$apply();
-          if (anchor && anchor.getPosition) {
-            infoWindow.open(map, anchor);
-          } else if (anchor && anchor instanceof google.maps.LatLng) {
-            infoWindow.open(map);
-            infoWindow.setPosition(anchor);
-          } else {
-            infoWindow.open(map);
-          }
-          var infoWindowContainerEl = infoWindow.content.parentElement.parentElement.parentElement;
-          infoWindowContainerEl.className = "ng-map-info-window";
+        templatePromise.then(function() {
+          $timeout(function() {
+            anchor && (scope.anchor = anchor);
+            var el = $compile(infoWindow.__template)(scope);
+            infoWindow.setContent(el[0]);
+            scope.$apply();
+            if (anchor && anchor.getPosition) {
+              infoWindow.open(map, anchor);
+            } else if (anchor && anchor instanceof google.maps.LatLng) {
+              infoWindow.open(map);
+              infoWindow.setPosition(anchor);
+            } else {
+              infoWindow.open(map);
+            }
+            var infoWindowContainerEl = infoWindow.content.parentElement.parentElement.parentElement;
+            infoWindowContainerEl.className = "ng-map-info-window";
+          });
         });
       };