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Adding Marker to Google Maps in google-map-react

I am using the google-map-react NPM package to create a Google Map and several markers.

Question: How can we add the default Google Maps markers to the map?

From this Github issue, it seems that we need to access the internal Google Maps API using the onGoogleApiLoaded function.

Referring to an example from the Google Maps JS API docs, we can use the following code to render the marker, but how do we define the references to map?

var marker = new google.maps.Marker({     position: myLatLng,     map: map,     title: 'Hello World!' }); 

Current Code:

renderMarkers() {     ... }  render() {     return (         <div style={{'width':800,'height':800}}>             <GoogleMap                 bootstrapURLKeys={{key: settings.googleMapApiKey}}                 defaultZoom={13}                 defaultCenter={{                      lat: this.props.user.profile.location.coordinates[1],                      lng: this.props.user.profile.location.coordinates[0]                 }}                 onGoogleApiLoaded={({map, maps}) => this.renderMarkers()}                 yesIWantToUseGoogleMapApiInternals             >             </GoogleMap>         </div>     ); } 
like image 342
Nyxynyx Avatar asked Dec 31 '16 04:12

Nyxynyx


2 Answers

Edit:
Since this answer was posted the docs (and likely, the API) of the GoogleMapReact element was changed to support children. Any child with lat and lng would be rendered at the corresponding location on the map, as also indicated by @Jobsamuel's answer.

The onGoogleApiLoaded callback should not be used for this purpose, as it is inferior to the declarative style and would not be re-run if changes are made to the map.


Original answer (outdated):

This may not be entirely clear from the description in the Readme, but the maps argument is, in fact, the maps API object (and map is, of course, the current Google Map instance). Therefore, you should pass both to your method:

onGoogleApiLoaded={({map, maps}) => this.renderMarkers(map, maps)} 

and use them:

renderMarkers(map, maps) {   let marker = new maps.Marker({     position: myLatLng,     map,     title: 'Hello World!'   }); } 
like image 98
MasterAM Avatar answered Oct 11 '22 13:10

MasterAM


Adding a marker on your map isn't as easy as we would like to, mostly because the confusing docs but here you have a super easy example:

const Map = props => {   return (     <GoogleMapReact      bootstrapURLKeys={{ props.key }}      defaultCenter={{lat: props.lat, lng: props.lng}}      defaultZoom={props.zoom}>         {/* This is the missing part in docs:          *          * Basically, you only need to add a Child Component that          * takes 'lat' and 'lng' Props. And that Component should          * returns a text, image, super-awesome-pin (aka, your marker).          *          */}        <Marker lat={props.lat} lng={props.lng}} />     </GoogleMapReact>   ) }  const Marker = props => {   return <div className="SuperAwesomePin"></div> } 
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Jobsamuel Avatar answered Oct 11 '22 12:10

Jobsamuel