javascriptcssleafletmarkerclusterer

Changing leaflet markercluster icon color, inheriting the rest of the default CSS properties

So, I'm trying to change the color of the markercluster icons in a leaflet map. I just want to change the color inheriting the rest of the default properties (i.e., shape, text properties, etc...).

In this an example, there is something similar to what I want to get, but they define a brand new CSS class without using the default icons styling. What I need is something like this but with custom colors:

enter image description here

I do know that I have to customize iconCreateFunction. I'm trying in this way:

CSS

.foo { background-color: red;}
.bar { background-color: blue;}

JavaScript

var markers = L.markerClusterGroup({
    iconCreateFunction: function(cluster) {
        // here there is a piece code that determines the value of the variable 'class_name' is either foo or bar
        return L.divIcon({ className: "marker-cluster-medium "+class_name});
    }
});

Unfortunately, that solution does not work and leads to a ugly icon rendering.

How can I just change the color of the default markercluster icons?

Solution

  • Your iconCreateFunction should look some thing like this...

        iconCreateFunction: function (cluster) {
     var childCount = cluster.getChildCount();
     var c = ' marker-cluster-';
     if (childCount < 10) {
       c += 'small';
     } 
     else if (childCount < 100) {
       c += 'medium';
     } 
     else {
       c += 'large';
     }
    
     return new L.divIcon({ html: '<div><span>' + childCount + '</span></div>', 
      className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });
    }

    ...and change CSS to something like this...

        .marker-cluster-small {
    background-color: rgba(218, 94, 94, 0.6);
    }
    .marker-cluster-small div {
    background-color: rgba(226, 36, 36, 0.6);
    }
    .marker-cluster-medium {
    background-color: rgba(241, 211, 87, 0.6);
    }
    .marker-cluster-medium div {
    background-color: rgba(240, 194, 12, 0.6);
    }

    .marker-cluster-large {
    background-color: rgba(253, 156, 115, 0.6);
    }
    .marker-cluster-large div {
    background-color: rgba(241, 128, 23, 0.6);
    }

    See the below plunker for a complete working example:

    https://plnkr.co/edit/GvDbB1rzIZ4bvIkQjM0p?p=preview