JSPM

google-map-react is a component written over a small set of the Google Maps API. It allows you to render any React component on the Google Map. It is fully isomorphic and can render on a server. Additionally, it can render map components in the browser even if the Google Maps API is not loaded. It uses an internal, tweakable hover algorithm - every object on the map can be hovered.

It allows you to create interfaces like this example (You can scroll the table, zoom/move the map, hover/click on markers, and click on table rows)

##Features

###Works with your Components Instead of the ugly Google Maps markers, balloons and other map components, you can render your cool animated react components on the map.

###Isomorphic Rendering It renders on the server. (Welcome search engines) (you can disable javascript in browser dev tools, and reload any example page to see how it works)

###Component Positions Calculated Independently of Google Maps API It renders components on the map before (and even without) the Google Maps API loaded.

###Google Maps API Loads on Demand There is no need to place a <script src= tag at top of page. The Google Maps API loads upon the first usage of the GoogleMap component.

###Internal Hover Algorithm Now every object on the map can be hovered (however, you can still use css hover selectors if you want). If you try zooming out here example, you will still be able to hover on almost every map marker.

This algorithm allows you to tweak hover probability of map objects, for example making some objects "more hoverable". distance_hover example with different hover probabilities

##Known Issues

• Small icons jiggle on Firefox (I don't see this in my older 'GoogleMap' version, so I will find the problem soon)

##Installation

npm

npm install --save google-map-react

bower

bower install --save google-map-react

The global will be available at: window.GoogleMapReact

##What's it Look Like? In the simple case you just need to add lat lng props to any child of GoogleMap component.
simple example in action

import React, {PropTypes, Component} from 'react/addons';
import shouldPureComponentUpdate from 'react-pure-render/function';

import GoogleMap from 'google-map-react';
import MyGreatPlace from './my_great_place.jsx';

export default class SimpleMapPage extends Component {
  static defaultProps = {
    center: {lat: 59.938043, lng: 30.337157},
    zoom: 9,
    greatPlaceCoords: {lat: 59.724465, lng: 30.080121}
  };

  shouldComponentUpdate = shouldPureComponentUpdate;
  
  constructor(props) {
    super(props);
  }

  render() {
    return (
       <GoogleMap
        defaultCenter={this.props.center}
        defaultZoom={this.props.zoom}>
        <MyGreatPlace lat={59.955413} lng={30.337844} text={'A'} /* Kreyser Avrora */ />
        <MyGreatPlace {...this.props.greatPlaceCoords} text={'B'} /* road circle */ />
      </GoogleMap>
    );
  }
}

##Examples

• Placing react components on the map: simple (source)

• Custom map options: example (source)

• Hover effects: simple hover (source); distance hover (source)

• GoogleMap events: example (source)

• Example project: main (source); balderdash (same source as main)

• All api examples: google-map-react-examples

GoogleMap API

parameters

####apiKey (string)

Google maps api key. (Optional, but your map will be rate-limited with no key)

####defaultCenter (array or object)

[lat, lng] or { lat: lat, lng: lng} Default lat/lng at which to center the map - changing this prop throws a warning

####center (array or object)

[lat, lng] or { lat: lat, lng: lng} Lat/lng at which to center the map

####defaultZoom: (number)

Default map zoom level - changing this prop throws a warning

####zoom (number)

Map zoom level

####hoverDistance (number)

Default: 30

####margin (array)

####debounced (bool)

Default: true

callbacks

####options (func|object)

Set map options such as controls positions / styles, etc.

Example:

createMapOptions: function (maps) {
    return {
      panControl: false,
      mapTypeControl: false,
      scrollwheel: false,
      styles: [{ stylers: [{ 'saturation': -100 }, { 'gamma': 0.8 }, { 'lightness': 4 }, { 'visibility': 'on' }] }]
    }
  }

 <GoogleMap  onptions={createMapOptions} ... />

See "Custom map options example" in Examples below for a further example.

####onClick (func) (x, y, lat, lng, event)

The event prop in args is the outer div onClick event, not the gmap-api 'click' event.

Example:

_onClick = ({x, y, lat, lng, event}) => console.log(x, y, lat, lng, event)
// ES5 users
function _onClick(obj){ console.log(obj.x, obj.y, obj.lat, obj.lng, obj.event);}

<GoogleMap  onClick={_onClick} ... />

####onBoundsChange (func)

(center, zoom, bounds, marginBounds)

[lat, lng] = center;
[topLat, leftLng, bottomLat, rightLng] = bounds;

####onChildClick (func) ####onChildMouseEnter (func) ####onChildMouseLeave (func) ####onZoomAnimationStart (func) ####onZoomAnimationEnd (func) ####distanceToMouse (func) ####googleMapLoader (func)

####onGoogleApiLoaded (func) Directly access the maps API - use at your own risk!

<GoogleMap  onGoogleApiLoaded={({map, maps}) => console.log(map, maps)} />

To prevent warning message add yesIWantToUseGoogleMapApiInternals property to GoogleMap

<GoogleMap  onGoogleApiLoaded={({map, maps}) => console.log(map, maps)}
                       yesIWantToUseGoogleMapApiInternals
 />

Child Component API

parameters

lat (number)

Latitude to place the marker component

lng (number)

Longitude to place the marker component

$hover (bool) [automatic]

GoogleMap passes a $hover prop to hovered components. To detect hover it an uses internal mechanism, explained in x_distance_hover example

Example:

render() {
    const style = this.props.$hover ? greatPlaceStyleHover : greatPlaceStyle;

    return (
       <div style={style}>
          {this.props.text}
       </div>
    );
  }

Utility functions

####fitBounds (func) Use fitBounds to get zoom and center.

Example:

import { fitBounds } from 'google-map-react/utils';

const bounds = {
  nw: {
    lat: 50.01038826014866,
    lng: -118.6525866875
  },
  se: {
    lat: 32.698335045970396,
    lng: -92.0217273125
  }
};

const size = {
  width: 640, // Map width in pixels
  height: 380, // Map height in pixels
};

const {center, zoom} = fitBounds({nw, se}, size);

####tile2LatLng (func) ####latLng2Tile (func) ####getTilesIds (func)

Tips

Positioning a marker

Initially any map object has its top left corner at lat lng coordinates. It's up to you to set the object origin to 0,0 coordinates.

Example (centering the marker):

const MARKER_SIZE = 40;
const greatPlaceStyle = {
  position: 'absolute',
  width: MARKER_SIZE,
  height: MARKER_SIZE,
  left: -MARKER_SIZE / 2,
  top: -MARKER_SIZE / 2
}

render() {
  return (
    <div style={greatPlaceStyle}>
      {this.props.text}
    </div>
  );
}

Rendering in a modal

If at the moment of GoogleMap control created, a modal has no size (width,height=0) or/and not displayed, the simple solution is to add something like this in render:

render() {
  return this.props.modalIsOpen
    ? <GoogleMap />
    : null;
}

Adding a searchbox

import React from 'react';

export default class SearchBox extends React.Component {
  static propTypes = {
    placeholder: React.PropTypes.string,
    onPlacesChanged: React.PropTypes.func
  }
  render() {
    return <input ref="input" {...this.props} type="text"/>;
  }
  onPlacesChanged = () => {
    if (this.props.onPlacesChanged) {
      this.props.onPlacesChanged(this.searchBox.getPlaces());
    }
  }
  componentDidMount() {
    var input = React.findDOMNode(this.refs.input);
    this.searchBox = new google.maps.places.SearchBox(input);
    this.searchBox.addListener('places_changed', this.onPlacesChanged);
  }
  componentWillUnmount() {
    this.searchBox.removeListener('places_changed', this.onPlacesChanged);
  }
}

You will need to preload the google maps API, but google-map-react checks if the base api is already loaded, and if so, uses it, so it won't load a second copy of the library.

<script type="text/javascript" src="https://maps.google.com/maps/api/js?libraries=places&sensor=false"></script>

(Really big thanks to April Arcus for documentation fixes)
(thank you Dan Abramov for titles structure)
(great thanks to Vladimir Akimov he knows why)

License

MIT (http://www.opensource.org/licenses/mit-license.php)