How to clear leaflet map of all markers and layers

问题:

I have the fallowing code:

map: function (events) {
    var arrayOfLatLngs = [];
    var _this = this;

    // setup a marker group
    var markers = L.markerClusterGroup();

    events.forEach(function (event) {
        // setup the bounds
        arrayOfLatLngs.push(event.location);

        // create the marker
        var marker = L.marker([event.location.lat, event.location.lng]);

        marker.bindPopup(View(event));

        // add marker
        markers.addLayer(marker);
    });

    // add the group to the map
    // for more see https://github.com/Leaflet/Leaflet.markercluster
    this.map.addLayer(markers);

    var bounds = new L.LatLngBounds(arrayOfLatLngs);
    this.map.fitBounds(bounds);
    this.map.invalidateSize();
}

I initially call this function and it will add all events to the map with markers and clusters.

at some lather point i pass in some other events, the map will zoom in to the new events but the old ones are still on the map.

I've tried this.map.removeLayer(markers); and some other stuff, but I can't get the old markers to disappear

Any ideas?

回答1:

If you want to remove all the current layers (markers) in your group you can use the clearLayers method of L.markerClusterGroup(). Your reference is called markers so you would need to call:

markers.clearLayers();

回答2:

You're losing the marker reference because it's set with var. Try saving the references to 'this' instead.

mapMarkers: [],
map: function (events) {
    [...]
    events.forEach(function (event) {
        [...]
        // create the marker
        var marker = L.marker([event.location.lat, event.location.lng]);
        [...]
        // Add marker to this.mapMarker for future reference
        this.mapMarkers.push(marker);
    });
    [...]
}

Then later when you need to remove the markers run:

for(var i = 0; i < this.mapMarkers.length; i++){
    this.map.removeLayer(this.mapMarkers[i]);
}

Alternatively, instead of saving each reference to each marker, you can just save the cluster to 'this'.

回答3:

map._panes.markerPane.remove();

回答4:

I used a combination of the two best answers here from beije and Prayitno Ashuri.

Saving the markers to "this" so we can reference it later.

this.marker = L.marker([event.location.lat, event.location.lng]);

and then just removing the markers.

this.markers.remove()