title: Removing geojson layers Mapbox.js/Leaflet.js
body: <p>I'm having trouble removing multiple geojson layers at a time. When I keep them as feature layers, there is memory of each and every layer added, one right after the other. But when they become marker layers only the last layer clicked is removed. </p>
  
  <p>I've tried adding them to a group and calling clearLayers on the group, but that still only removes the last layer added, not all. Tried passing an id also, but that didn't seem to work either.</p>
  
  <pre><code>    $(function() {
  
          var geojson;
  
          var map = L.mapbox.map('map')
              .setView([29.9629, -90.0603], 6);
  
          var filters = document.getElementById('filters');
  
          var layerTwo = L.mapbox.featureLayer()
              .loadURL('panel/data/tamorethan5.geojson')
              .on('ready', layer)
          var layerOne = L.mapbox.featureLayer()
              .loadURL('panel/data/talessthan5.geojson')
              .on('ready', layer)
          var layerThree = L.mapbox.featureLayer()
              .loadURL('panel/data/palessthan5.geojson')
              .on('ready', layer)
          var layerFour = L.mapbox.featureLayer()
              .loadURL('panel/data/pamorethan5.geojson')
              .on('ready', layer)
  
          function layer() {
              var assetLayerGroup = new L.LayerGroup();
  
              var layer = this
              var name = layer.getGeoJSON().name;
              var item = filters.appendChild(document.createElement('div'));
              var checkbox = item.appendChild(document.createElement('input'));
              var label = item.appendChild(document.createElement('label'));
              checkbox.type = 'checkbox';
              checkbox.name ='radio';
              checkbox.id = 'myCheckbox';
              checkbox.value = name;
              label.innerHTML = name;
              label.class = label;
              label.setAttribute('for', name);
              checkbox.addEventListener('change', update);
  
              function update(val) {
                  if (checkbox.checked) {
                  console.log(layer)
                  drawLocations(layer._geojson)
                  } else {
                  newMapLayer.clearLayers();
  
                  }
              }
  
              drawLocations = function(layer) {
                  L.stamp(layer)
                  newMapLayer = L.geoJson(layer, {
                      style: style,
                      onEachFeature: onEachFeature,
                      pointToLayer: function(feature, latlng) {
                          var rad = 3;
                          var col = getColor(feature.properties, 'status');
                          return L.circleMarker(latlng, {
                              radius: rad,
                              fillColor: "#ff7800",
                              stroke: true,
                              weight: 2,
                              opacity: 0.8,
                              fillOpacity: 0.8,
                              className: "circle"
                          });
                      }
  
  
                  }).addTo(map);
  
              };
          } //end layer
  </code></pre>