[GIS] How to highlight marker dynamically with leaflet and leaflet draw

javascriptleafletleaflet-draw

I am trying to make a selection via drawing a rectangle (or any shape) with leaflet draw. The selected features should be highlighted. I saw that there are various functions within the leaflet source that could help (contains from Bounds class and _containsPoint from Poly) however I keep getting an error saying that layer does not have this function. I have tried putting the draw layer into a new variable by creating a new L.Polygon object and calling _containsPoint(), but this gives a similar error – saying that the function does not exist for that polygon.

var marker1 = L.marker([51.441767, 5.470247],{
    draggable: true
}).addTo(map);

var someLayerGroup = L.featureGroup();
marker1.addTo(someLayerGroup);

map.addControl(new L.Control.Draw({
    edit: {
    featureGroup: drawnItems,
        edit: false
    },
    draw: {
        marker: false,
        circlemarker: false,
        polyline: false,
        circle:  false,
        polygon: {
          allowIntersection: false,
          showArea: true
        }
    }
}));

map.on(L.Draw.Event.CREATED, function (event) {
    var layer2 = event.layer;
    var type = event.layerType;
    if(type==='rectangle'){
        //do rectangle specific actions
        someLayerGroup.eachLayer(function(layer){
            if(layer2.contains(layer)){
            //set style of the point
            layer.setStyle({fillColor: '#CCCC00'});
            }
        });
    }
    drawnItems.addLayer(layer2);
});

JsFiddle:
http://jsfiddle.net/ve2huzxw/2109/

Best Answer

There are two problems:

Instead you can use CircleMarkers and instantiate a L.LatLngBounds object with the corners of the drawn rectangle. Then check whether the point is contained in the bounds and change the point's marker style if yes.

var marker1 = L.circleMarker([51.441767, 5.470247],{
  draggable: true
}).addTo(map);

[...]

map.on(L.Draw.Event.CREATED, function (event) {
  var layer2 = event.layer;
  var corners = [layer2._latlngs[0],layer2._latlngs[2]]  //retrieve corner of rectangle
  var type = event.layerType;
  if(type==='rectangle'){
    //do rectangle specific actions
    someLayerGroup.eachLayer(function(layer){
    if(L.latLngBounds(corners).contains(layer._latlng)){ //call .contains on an L.LatLngBounds object
        //set style of the point
        layer.setStyle({fillColor: '#CCCC00'});          //.setStyle of L.CircleMarker
      }
    });
  }
  drawnItems.addLayer(layer2);
});

JSFiddle: http://jsfiddle.net/ve2huzxw/2116/

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