B4J Question GoogleMaps Marker - Dragged To New Location - Where?

[RichardN]

If you move a draggable Marker to a new location there is no exposure of it's new LatLng position as there is no Marker_Drop event to exploit.

How is it possible to read the new position? Is it possible to listen for this event?

 

[TILogistic]

see:

GoogleMapsDemo

Some time ago I played a lot with GoogleMaps according to this post: https://www.b4x.com/android/forum/threads/problem-with-googlemaps-handling-polygons.84238/#post-533844 The problem was to add other shapes on a googlemap overlapping existing shapes. When you move the mouse over an existing...

www.b4x.com

googlemapext.bas

 

[TILogistic]

GMapsFX 2.0.0 API

GMapsFX

 

[Erel]

You can get the position with Marker.Position. It might be possible a drag listener event but it is not trivial.

 

[TILogistic]

tips:

GMapsFX 2.0.0 API

Class EventHandlers

google.maps.event.addListener(map, 'event_type', function(event) {
document.jsHandlers.handleUIEvent('key', event.latLng);
});

   google.maps.event.addListener(marker, 'dragstart', function () {
     ...
    });

    google.maps.event.addListener(marker, 'drag', function () {
    ...
    });

    google.maps.event.addListener(marker, 'dragend', function () {
    ...
    })

 

[RichardN]

@oparra.... Thanks for the suggestions however @Erel appears to be suggesting that implementing a listener event for Marker DragStart/Drag/DragEnd may not be as simple as we imagine.

To usefully employ a user generated sequence of Google Map Markers you must be able to do one of the following..... either,

- Keep a List of their positions in code...... which requires capturing a marker's position AFTER a drag event or,
- Be able to iterate through the markers as a collection, capturing their positions when the user is done editing. Something like....

'Sadly markers are not a collection that can be accessed

For Each m As Marker In GoogleMap
    Log(m.Position.Latitude & ", " & m.Position.Longitude)
Next

Unfortunately it appears neither method is available.

 

[TILogistic]

if it is possible to do so.
We just don't want to alter the Google Map versions of B4J.

We already did it for our APPs.

We hope Erel will incorporate these methods in the future.

B4J/Libs_GoogleMaps at master · AnywhereSoftware/B4J

B4J core libraries. Contribute to AnywhereSoftware/B4J development by creating an account on GitHub.

github.com

 

[RichardN]

I have added a wish for the functionality to be added. Please feel free to add likes!

Wish for added functionality