google-maps-react-18-support
v2.1.0TypeScript
Google maps container
0/weekUpdated 2 years agoMITUnpacked: 112.9 KB
Published by Fullstack.io
npm install google-maps-react-18-support
Google Map React Component Tutorial 
> A declarative Google Map React component using React, lazy-loading dependencies, current-location finder and a test-driven approach by the Fullstack React team.
See the demo and accompanying blog post.
Quickstart
First, install the library:
``
shell
npm install --save google-maps-react
`
Automatically Lazy-loading Google API
The library includes a helper to wrap around the Google maps API. The GoogleApiWrapper Higher-Order component accepts a configuration object which must include an apiKey. See lib/GoogleApi.js for all options it accepts.
`javascript
import {GoogleApiWrapper} from 'google-maps-react';
// ...
export class MapContainer extends React.Component {}
export default GoogleApiWrapper({
apiKey: (YOUR_GOOGLE_API_KEY_GOES_HERE)
})(MapContainer)
`
Alternatively, the GoogleApiWrapper Higher-Order component can be configured by passing a function that will be called with whe wrapped component's props and should returned the configuration object.
`javascript
export default GoogleApiWrapper(
(props) => ({
apiKey: props.apiKey,
language: props.language,
}
))(MapContainer)
`
If you want to add a loading container _other than the default_ loading container, simply pass it in the HOC, like so:
`javascript
const LoadingContainer = (props) => (
Fancy loading container!
)
export default GoogleApiWrapper({
apiKey: (YOUR_GOOGLE_API_KEY_GOES_HERE),
LoadingContainer: LoadingContainer
})(MapContainer)
`
Sample Usage With Lazy-loading Google API:
`javascript
import {Map, InfoWindow, Marker, GoogleApiWrapper} from 'google-maps-react';
export class MapContainer extends Component {
render() {
return (
);
}
}
export default GoogleApiWrapper({
apiKey: (YOUR_GOOGLE_API_KEY_GOES_HERE)
})(MapContainer)
`
Note: Marker and InfoWindow components are disscussed below.
Examples
Check out the example site at: http://fullstackreact.github.io/google-maps-react
Additional Map Props
The Map component takes a number of optional props.
Zoom: (Shown Above) takes a number with the higher value representing a tighter focus on the map's center.
Style: Takes CSS style object - commonly width and height.
`javascript
const style = {
width: '100%',
height: '100%'
}
`
Container Style: Takes CSS style object - optional, commonly when you want to change from the default of position "absolute".
`javascript
const containerStyle = {
position: 'relative',
width: '100%',
height: '100%'
}
`
`javascript
containerStyle={containerStyle}
`
initialCenter: Takes an object containing latitude and longitude coordinates. Sets the maps center upon loading.
`javascript
google={this.props.google}
style={style}
initialCenter={{
lat: 40.854885,
lng: -88.081807
}}
zoom={15}
onClick={this.onMapClicked}
>
`
center: Takes an object containing latitude and longitude coordinates. Use this if you want to re-render the map after the initial render.
`javascript
google={this.props.google}
style={style}
center={{
lat: 40.854885,
lng: -88.081807
}}
zoom={15}
onClick={this.onMapClicked}
>
`
bounds: Takes a google.maps.LatLngBounds() object to adjust the center and zoom of the map.
`javascript
var points = [
{ lat: 42.02, lng: -77.01 },
{ lat: 42.03, lng: -77.02 },
{ lat: 41.03, lng: -77.04 },
{ lat: 42.05, lng: -77.02 }
]
var bounds = new this.props.google.maps.LatLngBounds();
for (var i = 0; i < points.length; i++) {
bounds.extend(points[i]);
}
return (
google={this.props.google}
initialCenter={{
lat: 42.39,
lng: -72.52
}}
bounds={bounds}>
);
`
The following props are boolean values for map behavior:
scrollwheel, draggable, keyboardShortcuts, disableDoubleClickZoom
The following props are boolean values for presence of controls on the map:
zoomControl, mapTypeControl, scaleControl, streetViewControl, panControl, rotateControl, fullscreenControl
The following props are object values for control options such as placement of controls on the map:
zoomControlOptions, mapTypeControlOptions, streetViewControlOptions
See Google Maps Controls for more information.
It also takes event handlers described below:
$3
The component handles events out of the box. All event handlers are optional.
#### onReady
When the instance has been loaded and is ready on the page, it will call the onReady prop, if given. The onReady prop is useful for fetching places or using the autocomplete API for places.
`javascript
fetchPlaces(mapProps, map) {
const {google} = mapProps;
const service = new google.maps.places.PlacesService(map);
// ...
}
render() {
return (
onReady={this.fetchPlaces}
visible={false}>
)
}
`
#### onClick
To listen for clicks on the component, pass the onClick prop:
`javascript
mapClicked(mapProps, map, clickEvent) {
// ...
}
render() {
return (
onClick={this.mapClicked} />
)
}
`
#### onDragend
When our user changes the map center by dragging the Map around, we can get a callback after the event is fired with the onDragend prop:
`javascript
centerMoved(mapProps, map) {
// ...
}
render() {
return (
onDragend={this.centerMoved} />
)
}
`
The component also listens to onRecenter, onBounds_changed, onCenter_changed, onDblclick, onDragstart, onHeading_change, onIdle, onMaptypeid_changed, onMousemove, onMouseout, onMouseover, onProjection_changed, onResize, onRightclick, onTilesloaded, onTilt_changed, and onZoom_changed events. See Google Maps Events for more information.
$3
You can control the visibility of the map by using the visible prop. This is useful for situations when you want to use the Google Maps API without a map. The component will load like normal. See the Google places demo
For example:
`javascript
visible={false}>
`
Subcomponents
The api includes subcomponents intended on being used as children of the Map component. Any child can be used within the Map component and will receive the three props (as children):
* map - the Google instance of the map
* google - a reference to the window.google object
* mapCenter - the google.maps.LatLng() object referring to the center of the map instance
$3
To place a marker on the Map, include it as a child of the component.
`javascript
style={{width: '100%', height: '100%', position: 'relative'}}
className={'map'}
zoom={14}>
s title will appear as a tooltip.'}
name={'SOMA'}
position={{lat: 37.778519, lng: -122.405640}} />
position={{lat: 37.759703, lng: -122.428093}} />
position={{lat: 37.762391, lng: -122.439192}}
icon={{
url: "/path/to/custom_icon.png",
anchor: new google.maps.Point(32,32),
scaledSize: new google.maps.Size(64,64)
}} />
``
The component accepts a position prop that defines the location for the position on the map. It can be either a raw object or a google.maps.LatLng() instance.
If no position is passed in the props, the marker will default to the current position of the map, i.e. the mapCenter prop.
You can also pass any other props you want with the . It will be passed back through marker events.
The marker component can also accept a child InfoMarker component for situations where there is only 1 marker and 1 infowindow.
`javascript
moveMarker(props, marker, e) {
console.log(e.latLng.lat(), e.latLng.lng()) // get the new coordinates after drag end
}
`
`javascript
id={1}
position={markerCenter}
draggable={true}
onDragend={this.moveMarker.bind(this)}
>
style={styles.infoWindow}
>
Click on the map or drag the marker to select location where the incident occurred
`
$3
The component listens for events, similar to the component.
#### onClick
You can listen for an onClick event with the (appropriately named) onClick prop.
`javascript
onMarkerClick(props, marker, e) {
// ..
}
render() {
return (
)
}
`
#### mouseover
You can also pass a callback when the user mouses over a instance by passing the onMouseover callback:
`javascript
onMouseoverMarker(props, marker, e) {
// ..
}
render() {
return (
)
}
`
$3
To place a polygon on the Map, set as child of Map component.
`javascript
render() {
const triangleCoords = [
{lat: 25.774, lng: -80.190},
{lat: 18.466, lng: -66.118},
{lat: 32.321, lng: -64.757},
{lat: 25.774, lng: -80.190}
];
return(
style={{width: '100%', height: '100%', position: 'relative'}}
className={'map'}
zoom={14}>
strokeColor="#0000FF"
strokeOpacity={0.8}
strokeWeight={2}
fillColor="#0000FF"
fillOpacity={0.35} />
)
}
`
#### Events
The component listens to onClick, onMouseover and onMouseout events.
$3
To place a polyline on the Map, set as child of Map component.
`javascript
render() {
const triangleCoords = [
{lat: 25.774, lng: -80.190},
{lat: 18.466, lng: -66.118},
{lat: 32.321, lng: -64.757},
{lat: 25.774, lng: -80.190}
];
return(
style={{width: '100%', height: '100%', position: 'relative'}}
className={'map'}
zoom={14}>
strokeColor="#0000FF"
strokeOpacity={0.8}
strokeWeight={2} />
)
}
`
#### Events
The component listens to onClick, onMouseover and onMouseout events.
$3
The component included in this library is gives us the ability to pop up a "more info" window on our Google map.
The visibility of the component is controlled by a visible prop. The visible prop is a boolean (PropTypes.bool) that shows the when true and hides it when false.
There are two ways how to control a position of the component.
You can use a position prop or connect the component directly to an existing component by using a marker prop.
`javascript
//note: code formatted for ES6 here
export class MapContainer extends Component {
state = {
showingInfoWindow: false,
activeMarker: {},
selectedPlace: {},
};
onMarkerClick = (props, marker, e) =>
this.setState({
selectedPlace: props,
activeMarker: marker,
showingInfoWindow: true
});
onMapClicked = (props) => {
if (this.state.showingInfoWindow) {
this.setState({
showingInfoWindow: false,
activeMarker: null
})
}
};
render() {
return (
onClick={this.onMapClicked}>
visible={this.state.showingInfoWindow}>
{this.state.selectedPlace.name}
)
}
}
`
$3
The throws events when it's showing/hiding. Every event is optional and can accept a handler to be called when the event is fired.
`javascript
onClose={this.windowHasClosed}
visible={this.state.showingInfoWindow}>
{this.state.selectedPlace.name}
`
#### onClose
The onClose event is fired when the has been closed. It's useful for changing state in the parent component to keep track of the state of the .
#### onOpen
The onOpen event is fired when the window has been mounted in the Google map instance. It's useful for keeping track of the state of the from within the parent component.
$3
!A red slightly transparent circle on a Google Map. The map is centered around an area in Sao Paulo, Brazil and there is a peculiar lake on the map that is shaped like a man.
To place a circle on the Map, set as child of Map component.
`javascript
render() {
const coords = { lat: -21.805149, lng: -49.0921657 };
return (
initialCenter={coords}
google={this.props.google}
style={{width: 500, height: 500, position: 'relative'}}
zoom={14}
>
center={coords}
onMouseover={() => console.log('mouseover')}
onClick={() => console.log('click')}
onMouseout={() => console.log('mouseout')}
strokeColor='transparent'
strokeOpacity={0}
strokeWeight={5}
fillColor='#FF0000'
fillOpacity={0.2}
/>
);
}
`
#### Events
The component listens to onClick, onMouseover and onMouseout events.
The GoogleApiWrapper automatically passes the google instance loaded when the component mounts (and will only load it once).
#### Custom Map Style
To set your own custom map style, import your custom map style in JSON format.
`javascript
const mapStyle = [
{
featureType: 'landscape.man_made',
elementType: 'geometry.fill',
stylers: [
{
color: '#dceafa'
}
]
},
]
_mapLoaded(mapProps, map) {
map.setOptions({
styles: mapStyle
})
}
render() {
return (
style={style}
google={this.props.google}
zoom={this.state.zoom}
initialCenter={this.state.center}
onReady={(mapProps, map) => this._mapLoaded(mapProps, map)}
>
...
);
}
`
Manually loading the Google API
If you prefer not to use the automatic loading option, you can also pass the window.google instance as a prop to your component.
`javascript
`
Issues?
If you have some issues, please make an issue on the issues tab and try to include an example. We've had success with https://codesandbox.io
An example template might look like: https://codesandbox.io/s/rzwrk2854
Contributing
`shell
git clone https://github.com/fullstackreact/google-maps-react.git
cd google-maps-react
npm install
make dev
``
The Google Map React component library uses React and the Google API to give easy access to the Google Maps library.
___
Fullstack React Book
This Google Map React component library was built alongside the blog post How to Write a Google Maps React Component.
This repo was written and is maintained by the Fullstack React team. In the book we cover many more projects like this. We walk through each line of code, explain why it's there and how it works.
This app is only one of several apps we have in the book. If you're looking to learn React, there's no faster way than by spending a few hours with the Fullstack React book.
License
MIT