React Leaflet: Add markers dynamically

Question

How to add markers dynamically to React-Leaflet maps?

I want to add new markers when user clicks on map. And I cannot get it work.

import React, { Component } from 'react'
import { render } from 'react-dom';
import Control from 'react-leaflet-control';
import { Map, Marker, Popup, TileLayer, ZoomControl, ScaleControl } from 'react-leaflet';
import './Points.scss'

export default class PointsMap extends Component {
  state = {
    lat: 50.2, 
    lng: 30.2,
    zoom: 13,
  }

  handleClick = (e) => {
    this.addMarker();
  }

  addMarker() {

    // A) Following raises error:  
    var marker3 = L.marker([50.5, 30.5]).addTo(this.refs.map);

    // B) With following marker doesn't appear on map:
    const position2 = [50,30];      
    <Marker map={this.refs.map} position={position2} />
  }

  render () {
    const position = [this.state.lat, this.state.lng]
    return (
      <Map ref='map' center={position} zoom={this.state.zoom} onClick=    {this.handleClick} >
        <ZoomControl position="topright" />
        <ScaleControl position="bottomright" />
        <TileLayer
      attribution='&copy <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
      url='http://{s}.tile.osm.org/{z}/{x}/{y}.png'
    />
    <Marker map={this.refs.map} position={position} >
      <Popup>
        <span>A pretty CSS3 popup. <br /> Easily customizable.</span>
      </Popup>
    </Marker>
  </Map>

    )
  }
}

In addMarker() I try to add new marker. I try to do that on 2 ways:

A)

 var marker3 = L.marker([50.5, 30.5]).addTo(this.refs.map);

It raises error:

 Uncaught TypeError: map.addLayer is not a function
     at NewClass.addTo (leaflet-src.js:3937)
     at PointsMap.addMarker (Points.js?12f5:54)

B)

const position2 = [50,30];      
    <Marker map={this.refs.map} position={position2} />

It doesn't add any new marker and it doesn't raise any error.

Do you have any idea how to add/remove markers dynamically?

Answer 1

In order to get the most out of react-leaflet you should be thinking how you can design your map rendering in a way that the react lifecycle handles both the clicks and displaying of markers. React-leaflet handles almost all of the leaflet gruntwork for you.

You should be using the component's state or props to keep track of which markers the component is displaying. So, instead of manually calling L.marker, you should simply render a new <Marker> component.

Here is the react way to add a marker after clicking on the map:

class SimpleExample extends React.Component {
  constructor() {
    super();
    this.state = {
      markers: [[51.505, -0.09]]
    };
  }

  addMarker = (e) => {
    const {markers} = this.state
    markers.push(e.latlng)
    this.setState({markers})
  }

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

And here's a jsfiddle: https://jsfiddle.net/q2v7t59h/413/