Leaflet layer toggling

Showing the functionality of toggling layers in Leaflet while preserving their reference for later usage (i.e. turning the layer back on). This is useful when working with many layers in leaflet and turning opacity to 0 won’t cut it because it can have negative effects when hover and click events require properly layered DOM elements.

Important takeaways:

• It’s important to scope your data to access it globally, or at least within your appropriate scope.
• Turn off a layer by referencing its variable using the removeLayer() method.
• Turn on a layer by referencing its variable using the addLayer() method.