How to remove all layers and features from map?

Question

I am working on a map and I would like to remove all features from the map on a certain event. The features are in multiple layers which are plotted dynamically.

Som

Answer 1

In the mabox-gl draw library, There is a function to do this.

draw.deleteAll().getAll();

This deletes all the features and layers on the map.

Answer 2

Loop over all the layers added to the map using the eachLayer method of L.Map, then call the removeLayer method of L.Map on each of them:

map.eachLayer(function (layer) {
    map.removeLayer(layer);
});

References:

eachLayer: http://leafletjs.com/reference.html#map-eachlayer

removeLayer: http://leafletjs.com/reference.html#map-removelayer

Please note that this wil remove ALL the layers from your map. That means also any tilelayers etc. I think in your case it would be best if you do not add all your featureLayers to the map instance, but create a group for them:

// Create group for your layers and add it to the map
var layerGroup = L.layerGroup().addTo(map);

$.getJSON('distributor-companies', function (data) {

    $.each(data, function (i, item) {
        if (item.geojson != '') {
            // Add the new featureLayer to the layerGroup
            var featureLayer = L.mapbox.featureLayer().addTo(layerGroup);
            $.getJSON('/geojson/' + item.geojson, function (data) {
                featureLayer.setGeoJSON(data);
                featureLayer.eachLayer(function (layer) {
                    layer.on('click', function (e) {
                        map.fitBounds(featureLayer.getBounds());
                    });
                });
            });
        }
    });
});

Now you can call the clearLayers method of L.LayerGroup which will clear of the current layers in the group:

layerGroup.clearLayers();

Reference:

L.LayerGroup: http://leafletjs.com/reference.html#layergroup

clearLayers: http://leafletjs.com/reference.html#layergroup-clearlayers

Answer 3

You can use the following truthy check to see if it's a valid geoJSON object:

map.eachLayer(function(layer) {
  if (!!layer.toGeoJSON) {
    map.removeLayer(layer);
  }
});