react-leaflet

What is react-leaflet?

The react-leaflet package is a React wrapper for the Leaflet library, which is a popular open-source JavaScript library for interactive maps. It allows developers to easily integrate and manipulate maps within React applications.

What are react-leaflet's main functionalities?

Displaying a Map

This code sample demonstrates how to display a basic map using react-leaflet. The MapContainer component is used to create the map, and the TileLayer component is used to add a tile layer from OpenStreetMap.

import { MapContainer, TileLayer } from 'react-leaflet';

function MyMap() {
  return (
    <MapContainer center={[51.505, -0.09]} zoom={13} style={{ height: '100vh', width: '100%' }}>
      <TileLayer
        url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
        attribution="&copy; <a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a> contributors"
      />
    </MapContainer>
  );
}

Adding Markers

This code sample shows how to add a marker to the map. The Marker component is used to place a marker at a specific position, and the Popup component is used to display a popup when the marker is clicked.

import { MapContainer, TileLayer, Marker, Popup } from 'react-leaflet';

function MyMap() {
  return (
    <MapContainer center={[51.505, -0.09]} zoom={13} style={{ height: '100vh', width: '100%' }}>
      <TileLayer
        url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
        attribution="&copy; <a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a> contributors"
      />
      <Marker position={[51.505, -0.09]}>
        <Popup>
          A pretty CSS3 popup. <br /> Easily customizable.
        </Popup>
      </Marker>
    </MapContainer>
  );
}

Drawing Shapes

This code sample demonstrates how to draw a polygon on the map. The Polygon component is used to create a polygon shape by specifying an array of latitude and longitude coordinates.

import { MapContainer, TileLayer, Polygon } from 'react-leaflet';

function MyMap() {
  const polygon = [
    [51.505, -0.09],
    [51.51, -0.1],
    [51.51, -0.12]
  ];

  return (
    <MapContainer center={[51.505, -0.09]} zoom={13} style={{ height: '100vh', width: '100%' }}>
      <TileLayer
        url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
        attribution="&copy; <a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a> contributors"
      />
      <Polygon positions={polygon} />
    </MapContainer>
  );
}

Other packages similar to react-leaflet

react-map-gl

react-map-gl is a React wrapper for Mapbox GL JS, which is a powerful library for interactive maps. It offers more advanced features and customization options compared to react-leaflet, but it requires a Mapbox access token.

google-maps-react

google-maps-react is a library for integrating Google Maps into React applications. It provides a simple API for adding maps and markers, but it is dependent on the Google Maps API, which may have usage limits and requires an API key.

react-google-maps

react-google-maps is another library for using Google Maps in React applications. It offers a more declarative approach compared to google-maps-react and includes additional features like drawing tools and heatmaps.

README

React-Leaflet

React components for Leaflet maps.

Work in progress

In development, use at your own risks.
Tests and documentation still being worked on.

Install

npm install react-leaflet

React and Leaflet are peer dependencies, if you haven't already installed them use:

npm install leaflet react react-leaflet

Getting started

All components are React wrappers for Leaflet elements and layers, they need a map instance and therefore must be included in a top-level <Map> component.

Leaflet example

var L = require("leaflet");

var position = [51.505, -0.09];
var map = L.map("map").setView(position, 13);

L.tileLayer("http://{s}.tile.osm.org/{z}/{x}/{y}.png", {
  attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

L.marker(position).addTo(map)
  .bindPopup("A pretty CSS3 popup. <br> Easily customizable.");

React-Leaflet

var React = require("react");
var {Map, Marker, Popup, TileLayer} = require("react-leaflet");

var position = [51.505, -0.09];
var map = (
  <Map center={position} zoom={13}>
    <TileLayer
      url="http://{s}.tile.osm.org/{z}/{x}/{y}.png"
      attribution='&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
    />
    <Marker position={position}>
      <Popup>
        <span>A pretty CSS3 popup.<br/>Easily customizable.</span>
      </Popup>
    </Marker>
  </Map>
);

React.render(map, document.getElementById("map-container"));

Note that the <Map> component creates its own <div> container for the map, it does not get attached to an existing node.

Known limitations

• At this point, not all layers are implemented and even less tested.
• Properties on most components are static: they are set during the first render but not updated when the component updates. Check the documentation and source code to know what properties are dynamic.

API

PropTypes

LatLng: One of [Number, Number], {lat: Number, lng: Number} or {lat: Number, lon: Number}.

LatLngList: An Array of LatLng.

Bounds: An instance of Leaflet.LatLngBounds or a LatLngList.

Events

Leaflet exposes its own events, different from React. You can listen to them using React-Leaflet by adding a callback to a property prefixed by onLeaflet. Ex: <Map onLeafletMoveend={this.handleMoveend}>...</Map>.
Check Leaflet documentation for the events associated to each component.

Components

The properties documented for each component are the ones aimed to be supported (tested and made dynamic when possible) by React-Leaflet.
All other properties are passed as the options argument to their corresponding Leaflet element and should work fine for static maps, it is however unlikely that they would updated if you change them afterwards.

You can directly access the Leaflet element created by a component using the getLeafletElement() method on this component. This leaflet element is usually created in componentWillMount(), except for the <Map> component where it can only be created after the <div> container is rendered.

Map

This is the top-level component that must be mounted for children ones to be rendered. Refer to Leaflet documentation for more information about the properties.

Properties

• center (optional LatLng, dynamic): Center of the map. This property is dynamic, if you change it it will be reflected in the map.
• id (optional String): The ID of the <div> container for the map. If you don't provide it, a unique one will be created.
• maxBounds (optional Bounds)
• maxZoom (optional Number)
• minZoom (optional Number)
• zoom (optional Number, dynamic)

UI Layers

Marker

• position (required LatLng, dynamic)

Popup

The Popup children will be rendered as its content using React.renderToStaticMarkup(), they must be valid React elements.

• position (optional LatLng, dynamic)

Raster Layers

TileLayer

• url (required String, dynamic)
• opacity (optional Number, dynamic)
• zIndex (optional Number, dynamic)

ImageOverlay

• url (required String, dynamic)
• opacity (optional Number, dynamic)
• attribution (optional String)

Implemented but needing testing and documentation

• CanvasTileLayer
• WMSTileLayer

Vector Layers

Circle

• center (required LatLng, dynamic)
• radius (required Number, dynamic)

CircleMarker

• center (required LatLng, dynamic)
• radius (optional Number, dynamic)

Polyline

• positions (required LatLngList, dynamic)

MultiPolyline

• polylines (required Array of LatLngList, dynamic)

Polygon

• positions (required LatLngList, dynamic)

MultiPolygon

• polygons (required Array of LatLngList, dynamic)

Rectangle

• bounds (required Bounds, dynamic)

Other Layers

Implemented but needing testing and documentation

• FeatureGroup
• GeoJson

License

MIT
See LICENSE file.