Establishing an infoWindow for a series of markers generated within a callback function for the directionsService

I am facing a challenge with setting infoWindows for markers that are created within the callback function of a directionsService using Google Maps API V3. Despite trying various approaches, I have not been successful in achieving this task...

Below is an outline of how my code is structured:

for(i=0;i<markersList.length;i++){
map = someMap
var request = myRequestObject;
var directionsService = new google.maps.DirectionsService();
var directionsDisplay = new google.maps.DirectionsRenderer();
directionsDisplay.setMap(map);

directionsService.route(request, (function (address) {
  return function(response, status) {
    //Utilize the directions service to perform certain tasks
    //..Then create markers
     var marker = new google.maps.Marker({
                       map: map,
                       title: address['title']
                   });
    //Add the marker to a list of markers assigned to the map
    //This can be useful for deleting all markers later on
    map.markers.push(marker);

    //Creating multiple instances of infoWindows works fine
    //However, creating one shared info window for the entire map does not work from here
    //If attempted, it sets the same content for all info windows, which is not desired.
  }
 }
)(markersList[i])
);
}

I also tried the following approach, but encountered issues:

//Define setInfo as a custom function for my map
//Then invoke it to iterate over all markers and add info windows
google.maps.Map.prototype.setInfo = function() {

   for(var i=0; i < this.markers.length; i++){
        infowindow.setContent(this.markers[i].getTitle());
        google.maps.event.addListener(this.markers[i], 'click', function(){
            infowindow.close();
            infowindow.open(map,this.markers[i]);
            });
    }
};

I would call this function after completing the directionsService.route (as shown in the first code block), outside the main for-loop. However, it seems unable to find any markers associated with the map for some reason...

Can anyone share insights on how to correctly link infoWindows to the map markers? I aim to use a single infoWindow instance to enable closing it when another infoWindow is clicked (infoWindow.close()).

Thank you!

Answer №1

Within a geocoder callback function, I have my own approach (which differs slightly from the directionService). Still, the use of a callback function remains consistent, so the process should align. My method involves utilizing just one infowindow and can be applied in a loop when geocoding numerous addresses.

var infowindow = new google.maps.InfoWindow();

geocoder.geocode( { 'address': value}, function(results, status) {

  if (status == google.maps.GeocoderStatus.OK) {

        //generate and place marker on map based on geocode result
        var marker = new google.maps.Marker({  
            map: map,
            title: results[0].formatted_address,
            position: results[0].geometry.location
        });

        //add marker to array for potential clearing later
        markersArray.push(marker); 

        //set up listener for marker infowindow and define content
        google.maps.event.addListener(marker, 'click', function() { 
            infowindow.close();
            infowindow.setContent(results[0].formatted_address);
            infowindow.open(map,marker);
        });
    }
});

Answer №2

To improve efficiency, consider utilizing an external function to set the content on the infowindow when adding markers instead of declaring the event listener inline within your loop. This approach prevents the issue of all markers using the same content value from the last iteration of the loop.

var marker = new google.maps.Marker({
    map: map,
    title: address['title']
});
// Add the marker to a list of markers associated with the map
// This list can be helpful for removing markers later on
map.markers.push(marker);

// Attach an event listener to the marker
bindInfoWindow(marker, map, infowindow, address['title']);

The bindInfoWindow function is straightforward:

function bindInfoWindow(marker, map, infowindow, html) {
    google.maps.event.addListener(marker, 'click', function() {
        infowindow.setContent(html);
        infowindow.open(map, marker);
    });
} 

Note that it's unnecessary to call infowindow.close() before infowindow.open(). Since there is only one infowindow, the API handles closing it automatically before opening it at the new location.

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