Here's what I want to do:
Show all features of the GeoJSON file using Leaflets. Connect to the database, in a database there is a table that has an ID column that matches the GeoJSON file feature, and there is a column containing the range (1-4).
IF range = 1: red; range = 2: yellow; range = 3: green; range = 4: blue;
Does anyone know this example or the idea how this should be done? I'm following this method Choropleth but I can only do this by adding a property and entering the value into the GeoJson file. But now I want to do it dynamically, by storing the range number values in the database.