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).

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.

enter image description here


Then in your style section, do something like this, referring to the range values field this way. (I called mine Range)


Now you have to create a function to style it using those values.

// Set function for color ramp
function getColor(range){
    return range == '1' ? 'red' :
    range == '2' ? 'yellow' :
    range == '3' ? 'green' :
    range == '4' ? 'blue' :
    'white';  //In case it's not defined.

Note: I have quotes around the range value, as if it's stored as a string, if you stored it as a number, remove the quotes.

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