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USING CUSTOM ICONS WITH LEAFLET: A BEGINNER'S GUIDE

Abstract: Learn how to use custom icons in Leaflet, a popular open-source
JavaScript mapping library.

2024-06-30 by DevCodeF1 Editors



USING CUSTOM ICONS WITH LEAFLET: A BEGINNER'S GUIDE

Leaflet is a popular open-source JavaScript library for interactive maps, widely
used for web mapping applications. One of the many features Leaflet offers is
the ability to use custom icons for markers. In this guide, we will walk through
the process of using custom icons with Leaflet, with a focus on using the
Awesome Icons library. By the end of this guide, you will have learned how to
define and use custom icons in your Leaflet maps.


GETTING STARTED

Before we dive into custom icons, let's first make sure we have a basic Leaflet
map set up. Here's an example of a simple Leaflet map:

var map = L.map('map').setView([37.7749, -122.4194], 13);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { attribution:
'© OpenStreetMap contributors' }).addTo(map);

This code creates a new Leaflet map and adds a base layer of OpenStreetMap
tiles. Now, let's move on to custom icons.


DEFINING CUSTOM ICONS

To use custom icons in Leaflet, we first need to define them. The Awesome Icons
library provides a simple way to define custom icons using a variety of
pre-built icons and color schemes. Here's an example of how to define a custom
icon using Awesome Icons:

var LeafIcon = L.Icon.extend({ options: { shadowUrl: 'markers-shadow.png',
iconSize: [38, 95], shadowSize: [50, 64], iconAnchor: [22, 94], shadowAnchor:
[4, 62], popupAnchor: [-3, -76] } }); var greenIcon = new LeafIcon({ iconUrl:
'markers-green.png' });

In this example, we're defining a new icon called greenIcon using the Awesome
Icons library. We're extending the L.Icon class and setting various options such
as iconSize, shadowSize, and iconAnchor. The iconUrl option specifies the path
to the icon image file.


USING CUSTOM ICONS

Now that we've defined our custom icon, we can use it in our map. Here's an
example of how to add a marker with our custom icon:

L.marker([37.7749, -122.4194], { icon: greenIcon }).addTo(map);

In this example, we're creating a new marker at the coordinates [37.7749,
-122.4194] and setting the icon option to our greenIcon variable. This will
display the marker with our custom green icon.

In this guide, we've covered the basics of using custom icons with Leaflet.
We've learned how to define custom icons using the Awesome Icons library, and
how to use them in our maps. With this knowledge, you can now create your own
unique and visually appealing maps using Leaflet.

 * Leaflet is a popular open-source JavaScript library for interactive maps.
 * Custom icons can be defined using the Awesome Icons library.
 * Custom icons can be used in Leaflet maps by setting the icon option when
   creating a marker.


REFERENCES

 * Leaflet: https://leafletjs.com/
 * Awesome Icons: https://github.com/lvoogdt/Leaflet.awesome-markers

Tags::  Leaflet JavaScript Mapping Custom Icons




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