Organizing layers with Leaflet's layerGroup controls

I am working with a series of Leaflet FeatureGroups, each made up of GeoJSON layers. These FeatureGroups have similar concepts but need to be kept separate for control purposes. I also require the ability to toggle all FeatureGroups on and off simultaneously. Is there a method to achieve this?

Upon reviewing the documentation, I did not come across any event that triggers when a FeatureGroup is toggled. There seems to be no documented way of grouping FeatureGroups into a superGroup either.

To provide a visual representation of the process: GeoJSON data is converted into layers in Leaflet. These layers represent various administrative boundaries such as States and Counties. Each layer is placed in a specific FeatureGroup based on its category (e.g., Arkansas and New York in State FeatureGroup, Ford and Lincoln counties in County FeatureGroup). This setup allows me to manage opacity and styling for each FeatureGroup individually. However, I still require a method to toggle all groups collectively. While Leaflet permits toggling FeatureGroups individually, it lacks a super set function for this purpose.

Are there any suggestions on how to accomplish this task?

New revised question:

Which event triggers when switching a LayerGroup on and off? Is there a way to interact with this event?

javascriptjqueryleaflet

Answer №1

My approach involved using my standard LayerGroups and FeatureGroups, along with a special FeatureGroup that encompassed all the layers in every group. This way, whenever a shape or layer was added to a FeatureGroup, it was also added to the overarching FeatureGroup for comprehensive tracking. And of course, when removing a shape or layer, it was essential to remember to remove it from both groups. Adding this foundational FeatureGroup to the map alongside the other groups proved to work seamlessly.

Answer №2

Currently, Leaflet does not have a built-in event for when a LayerGroup is toggled on or off (specifically with the L.Control). However, it would be beneficial to have this feature. In the meantime, you can customize the code to meet your specific needs. Here's an example:

var customLayerControl = L.Control.Layer.extend({
  _onInputClick: function(Layer, name){ 
      // This is similar to calling super() if you're unfamiliar!
      L.Control.Layers.prototype._onInputClick.call(this,Layer,name);
      // Add your custom actions here
    }
});

Instead of using the standard L.Control.Layers, utilize your customized layer control like so:

map.addControl(new customLayerControl({}, {'Custom Layer':customLayer},{}));

I hope this information proves useful.

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