Practical GIS

Annotating attributes with popups

A truly great feature of Leaflet is its convenient popup management. We don't have to create any kind of popup mechanism (HTML elements, close button, or custom code on different events); Leaflet can create full-fledged popups automatically just by providing an HTML string. An HTML string is a simple string that can contain HTML tags. The HTML tags are interpreted rather than printed directly, and the resulting DOM structure is rendered instead. Let's create some popup content for our houses layer:

1. Add an additional property to the optional list of properties of the L.geoJson.ajax layer. The property name must be onEachFeature. It requires two properties: one for every processed feature and one for the processed ...