Custom Marker as a component.

I have multiple views and on different views I have different maps, however, I need to display user location on every map, I decided to turn it into reusable component that would watch user location and update it when necessery as well as only return the Marker.

An example of a map code

import React from 'react';
import {Map, InfoWindow, Marker, GoogleApiWrapper} from 'google-maps-react';
import apiKey from './maps-api-key.js';
import UserLocation from '../shared-components/user-location.jsx';

const styles = {
  map: {
    maxWidth: '85%',
    margin: '5% auto 0'
  },
  container: {
    minHeight: '400px',
    maxHeight: '800px',
    height: '70%'
  }
};

export class SingleMarkerMap extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      showingInfoWindow: false,
      activeMarker: {},
      selectedPlace: {}
    };
  }

  onMarkerClick(props, marker) {
    this.setState({
      selectedPlace: props,
      activeMarker: marker,
      showingInfoWindow: true
    });
  }

  onMapClicked() {
    if (this.state.showingInfoWindow) {
      this.setState({
        showingInfoWindow: false,
        activeMarker: null
      });
    }
  }

  render() {
    const {google, coord, desc, title} = this.props;
    const {onMapClicked, onMarkerClick} = this;
    const {activeMarker, showingInfoWindow} = this.state;
    return (
      <Map
        style={styles.map}
        containerStyle={styles.container}
        className="super-map-wrapper"
        google={google}
        initialCenter={coord}
        onClick={onMapClicked.bind(this)}
        zoom={13}>

        <Marker
          visible={true}
          onClick={onMarkerClick.bind(this)}
          title={desc}
          name={title} />

        <InfoWindow
          marker={activeMarker}
          visible={showingInfoWindow}>
          <div style={{maxWidth:'40vw'}}>
            <h2>{title}</h2>
            <p>{desc}</p>
          </div>
        </InfoWindow>

        <UserLocation/>

      </Map>
    );
  }
}

export default GoogleApiWrapper(apiKey)(SingleMarkerMap);

and the contents of user-location.jsx

import React from 'react';
import {Marker} from 'google-maps-react';

const defaultLocation = {
  lng: 2.1663020364940166,
  lat: 41.382491852864234
};

export class UserLocation extends React.Component {
  constructor() {
    super();
    this.state = {
      coord: {},
      visible: false
    };
  }

  updateLocation(pos) {
    let blueDot = {
      url: '/img/map/bluedot.png',
    };
    if ('google' in window) {
      blueDot.size = new google.maps.Size(32, 32);
      blueDot.origin = new google.maps.Point(0, 0);
      blueDot.anchor = new google.maps.Point(8, 8);
      blueDot.scaledSize = new google.maps.Size(16, 16);
    }
    this.setState({
      coord: {
        lat: pos.coords.latitude,
        lng: pos.coords.longitude
      },
      visible: true,
      icon: blueDot
    });
  }

  onErrorGettingLocation(err) {
    console.log('error getting location', err);
  }

  componentWillMount() {
    let gl = navigator.geolocation;
    const glOptions = {
      enableHighAccuracy: true,
      timeout: 15000,
      maximumAge: 0
    };
    gl.watchPosition(
      this.updateLocation.bind(this),
      this.onErrorGettingLocation.bind(this),
      glOptions
    );
  }

  render() {
    let {visible, coord, icon} = this.state;

    return visible ?
      <Marker
        position={defaultLocation}
        icon={icon}
        title="Your location"
        name="marker name" /> :
	  null;
  }
}

export default UserLocation;

With logging I can see that the user location component is mounted and updates, however the icon does not appear on the map.

If I write the userLocation as a simple Marker directly inside the Map I am able to see the dot. Code example below

import React from 'react';
import {Map, InfoWindow, Marker, GoogleApiWrapper} from 'google-maps-react';
import apiKey from './maps-api-key.js';

const styles = {
  map: {
    maxWidth: '85%',
    margin: '5% auto 0'
  },
  container: {
    minHeight: '400px',
    maxHeight: '800px',
    height: '70%'
  }
};

export class SingleMarkerMap extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      showingInfoWindow: false,
      activeMarker: {},
      selectedPlace: {},
      visible: false,
      userLocationCoord: {}
    };
  }

  onMarkerClick(props, marker) {
    this.setState({
      selectedPlace: props,
      activeMarker: marker,
      showingInfoWindow: true
    });
  }

  onMapClicked() {
    if (this.state.showingInfoWindow) {
      this.setState({
        showingInfoWindow: false,
        activeMarker: null
      });
    }
  }

  // start from user location

  updateLocation(pos) {
    let blueDot = {
      url: '/img/map/bluedot.png',
    };
    if ('google' in window) {
      blueDot.size = new google.maps.Size(32, 32);
      blueDot.origin = new google.maps.Point(0, 0);
      blueDot.anchor = new google.maps.Point(8, 8);
      blueDot.scaledSize = new google.maps.Size(16, 16);
    }
    this.setState({
      userLocationCoord: {
        lat: pos.coords.latitude,
        lng: pos.coords.longitude
      },
      visible: true,
      icon: blueDot
    });
  }

  onErrorGettingLocation(err) {
    console.log('error getting location', err);
  }

  componentWillMount() {
    let gl = navigator.geolocation;
    const glOptions = {
      enableHighAccuracy: true,
      timeout: 15000,
      maximumAge: 0
    };
    gl.watchPosition(
      this.updateLocation.bind(this),
      this.onErrorGettingLocation.bind(this),
      glOptions
    );
  }

  // end from user location

  render() {
    const {google, coord, desc, title} = this.props;
    const {onMapClicked, onMarkerClick} = this;
    const {
      activeMarker,
      showingInfoWindow,
      visible,
      userLocationCoord,
      icon
    } = this.state;
    return (
      <Map
        style={styles.map}
        containerStyle={styles.container}
        className="super-map-wrapper"
        google={google}
        initialCenter={coord}
        onClick={onMapClicked.bind(this)}
        zoom={13}>

        <Marker
          visible={true}
          onClick={onMarkerClick.bind(this)}
          title={desc}
          name={title} />

        <InfoWindow
          marker={activeMarker}
          visible={showingInfoWindow}>
          <div style={{maxWidth:'40vw'}}>
            <h2>{title}</h2>
            <p>{desc}</p>
          </div>
        </InfoWindow>

        {
          visible ?
            <Marker
              position={userLocationCoord}
              icon={icon}
              title="marker title"
              name="marker name" /> :
            null
        }

      </Map>
    );
  }
}

export default GoogleApiWrapper(apiKey)(SingleMarkerMap);

Is there something I am missing here or the Marker component cannot be inside standard react components?

Thank you

[michealpetersona]

The Marker component can’t be rendered inside another component since the map does not render its children in the traditional manner. You can get around this by returning the JSX directly to where you need it by calling the render function on a React component or by using a function as I did below.

const CustomMarker = (props) => {
    return(
        <Marker position={props.location}/>
    );
}
render(){
        return (
            <Map google={this.props.google} zoom={10} initialCenter={{lat: 40.7484, lng: -73.9857}}>
                {CustomMarker({location: {lat: 40.7484, lng: -73.9857}})}
            </Map>
        );
    }
}

This issue should remain open though since the original approach is the React way of doing it…

[fullmoon6661]

From this https://github.com/fullstackreact/google-maps-react/issues/51 I found that explicitly pass the props from the parent actually work In your case, it would be something like

<UserLocation {...this.props}/>

and in the user-location.jsx should be like

render() {
    let {visible, coord, icon} = this.state;
    return visible ?
    <Marker
        {...this.props}
        position={defaultLocation}
        icon={icon}
        title="Your location"
        name="marker name" /> :
    null;
}

I’m not sure if this is the right way of doing it