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Gmap Draggable Markers

When a draggable marker is dragged and dropped, a server side markerDragListener can be invoked passing a MarkerDragEvent that contains a reference to the dragged marker whose positon is updated already.

SERVER API CLIENT API TAG VDL

draggableMarkers.xhtml
DraggableMarkersView.java


<script src="https://maps.google.com/maps/api/js?key=AIzaSyCvCDkYieuUBmMWon_mfLAfjuaeuosuqow&amp;sensor=false"></script>

<div class="card">
    <h:form prependId="false">
        <p:growl id="growl" showDetail="true"/>

        <p:gmap id="gmap" center="36.890257,30.707417" zoom="13" type="HYBRID"
                model="#{draggableMarkersView.draggableModel}" style="width:100%;height:400px">
            <p:ajax event="markerDrag" listener="#{draggableMarkersView.onMarkerDrag}" update="growl"/>
        </p:gmap>
    </h:form>
</div>


package org.primefaces.showcase.view.data.gmap;

import java.io.Serializable;


import jakarta.annotation.PostConstruct;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.context.FacesContext;
import jakarta.faces.view.ViewScoped;
import jakarta.inject.Named;

import org.primefaces.event.map.MarkerDragEvent;
import org.primefaces.model.map.DefaultMapModel;
import org.primefaces.model.map.LatLng;
import org.primefaces.model.map.MapModel;
import org.primefaces.model.map.Marker;

@Named
@ViewScoped
public class DraggableMarkersView implements Serializable {

    private MapModel<Long> draggableModel;

    @PostConstruct
    public void init() {
        draggableModel = new DefaultMapModel<>();

        //Shared coordinates
        LatLng coord1 = new LatLng(36.879466, 30.667648);
        LatLng coord2 = new LatLng(36.883707, 30.689216);
        LatLng coord3 = new LatLng(36.879703, 30.706707);
        LatLng coord4 = new LatLng(36.885233, 30.702323);

        //Draggable
        draggableModel.addOverlay(new Marker<>(coord1, "Konyaalti", 1L));
        draggableModel.addOverlay(new Marker<>(coord2, "Ataturk Parki", 2L));
        draggableModel.addOverlay(new Marker<>(coord3, "Karaalioglu Parki", 3L));
        draggableModel.addOverlay(new Marker<>(coord4, "Kaleici", 4L));

        for (Marker<Long> premarker : draggableModel.getMarkers()) {
            premarker.setDraggable(true);
        }
    }

    public MapModel<Long> getDraggableModel() {
        return draggableModel;
    }

    public void onMarkerDrag(MarkerDragEvent<Long> event) {
        Marker<Long> marker = event.getMarker();

        FacesContext.getCurrentInstance().addMessage(null,
                new FacesMessage(FacesMessage.SEVERITY_INFO,
                        "Marker " + marker.getData() + " Dragged",
                        "Lat:" + marker.getLatlng().getLat() + ", Lng:" + marker.getLatlng().getLng()));
    }
}