transferring a LatLng variable from one function to initialize Google Maps

I have a database in firebase that stores latitude and longitude values which I retrieve as the variable coords.

function getCoords() {
    var place_data= firebase.database().ref("/place/name");

    place_data.once('value').then(function(snapshot) {

    var longitude = snapshot.child("Event_long").val();
    var latitude = snapshot.child("Event_lat").val();
    var coords = new google.maps.LatLng(latitude, longitude);
    alert(coords);  //after running this code, I get (43.6672568, -79.4000838) displayed in an alert message//
});
}

This code is for initializing Google Maps.

function initializeMap() {
 var iconBase = {url:'/images/wing.pin.png'};

 var map = new google.maps.Map(document.getElementById('map'), {
 zoom: 15,
 center: coords,
 mapTypeId: 'satellite'
 });

 marker = new google.maps.Marker({
 icon: iconBase,
 map: map,
 draggable: true,
 animation: google.maps.Animation.DROP,
 position: coords
 });
 marker.addListener('click', toggleBounce);
 }

I am struggling to make the function initializeMap read the variable 'coords'. I've attempted making 'coords' a global variable and enclosing the getCoords function within another function, but they don't seem to work. Is there a more efficient way to achieve this?

javascriptgoogle-mapsfirebasefirebase-realtime-databaselatitude-longitude

Answer №1

Make sure to invoke functions.

Adjust your function so it can provide the latitude and longitude to the caller...

function getCoords() {
    var place_data = firebase.database().ref("/place/name");

    place_data.once('value').then(function(snapshot) {

    var longitude = snapshot.child("Event_long").val();
    var latitude = snapshot.child("Event_lat").val();
    return new google.maps.LatLng(latitude, longitude); //updated this line
});
}

Now, call the function in this section...

function initializeMap() {
 var iconBase = {url:'/images/wing.pin.png'};
 var coords = getCoords(); // invoking here

 var map = new google.maps.Map(document.getElementById('map'), {
 zoom: 15,
 center: coords,
 mapTypeId: 'satellite'
 });

 marker = new google.maps.Marker({
 icon: iconBase,
 map: map,
 draggable: true,
 animation: google.maps.Animation.DROP,
 position: coords
 });
 marker.addListener('click', toggleBounce);
 }

Answer №2

I managed to achieve my goal by passing latitude and longitude as parameters in the initializeMap function like this:

function fetchCoordinates() {
var placeData = firebase.database().ref("/place/name");

placeData.once('value').then(function(snapshot) {

 var longitude = snapshot.child("Event_long").val();
 var latitude = snapshot.child("Event_lat").val();
 var coords = new google.maps.LatLng(latitude, longitude);

 initializeMap(latitude, longitude);
 });

 }


  //Display Map in Summary Tab//
  function initializeMap(latitude,longitude) {
  var iconBase = {url:'/images/wing.pin.png'};


  var map = new google.maps.Map(document.getElementById('map'), {
  zoom: 17,
  center:  new google.maps.LatLng(latitude, longitude),
  mapTypeId: 'roadmap'
  });

  marker = new google.maps.Marker({
  icon: iconBase,
  map: map,
  draggable: true,
  animation: google.maps.Animation.DROP,
  position:  new google.maps.LatLng(latitude, longitude)
  });
  marker.addListener('click', toggleBounce);
  }

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