如何将Reaction与Google Places API结合使用，以在Google地图上显示位置标记？-前端问题

How can I use React with Google Places API, to display place markers on a Google map?(如何将Reaction与Google Places API结合使用，以在Google地图上显示位置标记？)

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问题描述

我正在尝试构建一个与on Airbnb类似的地图，在其中您可以在拖动地图时查看位置标记。我要在地图上显示Google Places API中的酒店标记。

使用Google Maps中的以下JavaScript代码，我可以在Google地图上显示酒店，但我希望使用react-google-maps通过Reaction来实现这一点。

<!DOCTYPE html>
<html>
  <head>
    <title>Place searches</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }
      /* Optional: Makes the sample page fill the window. */
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script>
      // This example requires the Places library. Include the libraries=places
      // parameter when you first load the API. For example:
      // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">

      var map;
      var infowindow;

      function initMap() {
        var pyrmont = {lat: -33.867, lng: 151.195};

        map = new google.maps.Map(document.getElementById('map'), {
          center: pyrmont,
          zoom: 15
        });

        infowindow = new google.maps.InfoWindow();
        var service = new google.maps.places.PlacesService(map);
        service.nearbySearch({
          location: pyrmont,
          radius: 500,
          type: ['hotel']
        }, callback);
      }

      function callback(results, status) {
        if (status === google.maps.places.PlacesServiceStatus.OK) {
          for (var i = 0; i < results.length; i++) {
            createMarker(results[i]);
          }
        }
      }

      function createMarker(place) {
        var placeLoc = place.geometry.location;
        var marker = new google.maps.Marker({
          map: map,
          position: place.geometry.location
        });

        google.maps.event.addListener(marker, 'click', function() {
          infowindow.setContent(place.name);
          infowindow.open(map, this);
        });
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places&callback=initMap" async defer></script>
  </body>
</html>

react-google-maps有一个显示搜索输入字段的示例。这样，我就可以通过搜索来搜索并显示标记，例如，伦敦的酒店。但我不想搜索位置，而是想立即展示酒店的标记。(以下示例中的API密钥来自Reaction-Google-Maps示例。)

const _ = require("lodash");
const { compose, withProps, lifecycle } = require("recompose");
const {
  withScriptjs,
  withGoogleMap,
  GoogleMap,
  Marker,
} = require("react-google-maps");
const { SearchBox } = require("react-google-maps/lib/components/places/SearchBox");

const MapWithASearchBox = compose(
  withProps({
    googleMapURL: "https://maps.googleapis.com/maps/api/js?key=AIzaSyC4R6AN7SmujjPUIGKdyao2Kqitzr1kiRg&v=3.exp&libraries=geometry,drawing,places",
    loadingElement: <div style={{ height: `100%` }} />,
    containerElement: <div style={{ height: `400px` }} />,
    mapElement: <div style={{ height: `100%` }} />,
  }),
  lifecycle({
    componentWillMount() {
      const refs = {}

      this.setState({
        bounds: null,
        center: {
          lat: 41.9, lng: -87.624
        },
        markers: [],
        onMapMounted: ref => {
          refs.map = ref;
        },
        onBoundsChanged: () => {
          this.setState({
            bounds: refs.map.getBounds(),
            center: refs.map.getCenter(),
          })
        },
        onSearchBoxMounted: ref => {
          refs.searchBox = ref;
        },
        onPlacesChanged: () => {
          const places = refs.searchBox.getPlaces();
          const bounds = new google.maps.LatLngBounds();

          places.forEach(place => {
            if (place.geometry.viewport) {
              bounds.union(place.geometry.viewport)
            } else {
              bounds.extend(place.geometry.location)
            }
          });
          const nextMarkers = places.map(place => ({
            position: place.geometry.location,
          }));
          const nextCenter = _.get(nextMarkers, '0.position', this.state.center);

          this.setState({
            center: nextCenter,
            markers: nextMarkers,
          });
          // refs.map.fitBounds(bounds);
        },
      })
    },
  }),
  withScriptjs,
  withGoogleMap
)(props =>
  <GoogleMap
    ref={props.onMapMounted}
    defaultZoom={15}
    center={props.center}
    onBoundsChanged={props.onBoundsChanged}
  >
    <SearchBox
      ref={props.onSearchBoxMounted}
      bounds={props.bounds}
      controlPosition={google.maps.ControlPosition.TOP_LEFT}
      onPlacesChanged={props.onPlacesChanged}
    >
      <input
        type="text"
        placeholder="Customized your placeholder"
        style={{
          boxSizing: `border-box`,
          border: `1px solid transparent`,
          width: `240px`,
          height: `32px`,
          marginTop: `27px`,
          padding: `0 12px`,
          borderRadius: `3px`,
          boxShadow: `0 2px 6px rgba(0, 0, 0, 0.3)`,
          fontSize: `14px`,
          outline: `none`,
          textOverflow: `ellipses`,
        }}
      />
    </SearchBox>
    {props.markers.map((marker, index) =>
      <Marker key={index} position={marker.position} />
    )}
  </GoogleMap>
);

<MapWithASearchBox />

我已经试图解决这个问题很多天了，我一直在寻找教程，但我找不到解决方案。我知道我应该使用：

new google.maps.places.PlacesService()

和添加选项：

 const center = new google.maps.LatLng(37.422, -122.084068);
 const options = {
   location: center
   radius: '500',
   types: ['hotel']
 };

在使用REACT-GOOGLE-MAP时，我需要使用with Scriptjs。但我该如何把这一切放在一起呢？

如何使用带有Google Places API的action-google-map在地图上显示来自Google的酒店标记？

推荐答案

您可以通过将GoogleMap的引用传递给new google.maps.places.PlacesService()来创建服务，然后通过该服务可以使用nearbySearch()搜索酒店、餐馆等。正如Google Places Nearby Search API docs所说：

附近搜索允许您按关键字或类型搜索指定区域内的地点。

要触发fetchPlaces()方法，可以使用GoogleMap组件中的onTilesLoaded道具或componentDidMount()。在下面的示例中，我还将fetchPlaces传递给onBoundChanged，因为我的搜索基于bounds，所以每次我移动地图时它都可以给我新的地点，请注意：

const bounds = refs.map.getBounds();
const service = new google.maps.places.PlacesService(refs.map.context.__SECRET_MAP_DO_NOT_USE_OR_YOU_WILL_BE_FIRED);
const request = {
  bounds: bounds,
  type: ['hotel']
};

以下是我使用recompose的示例：

/*global google*/
import React from "react"
import { compose, withProps, withHandlers, withState } from "recompose"
import { withScriptjs, withGoogleMap, GoogleMap, Marker } from "react-google-maps"

const MyMapComponent = compose(
    withProps({
        googleMapURL: "https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=geometry,drawing,places",
        loadingElement: <div style={{ height: `100%` }} />,
        containerElement: <div style={{ height: `400px` }} />,
        mapElement: <div style={{ height: `100%` }} />,
    }),
    withScriptjs,
    withGoogleMap,
    withState('places', 'updatePlaces', ''),
    withHandlers(() => {
        const refs = {
            map: undefined,
        }

        return {
            onMapMounted: () => ref => {
                refs.map = ref
            },
            fetchPlaces: ({ updatePlaces }) => {
                let places;
                const bounds = refs.map.getBounds();
                const service = new google.maps.places.PlacesService(refs.map.context.__SECRET_MAP_DO_NOT_USE_OR_YOU_WILL_BE_FIRED);
                const request = {
                    bounds: bounds,
                    type: ['hotel']
                };
                service.nearbySearch(request, (results, status) => {
                    if (status == google.maps.places.PlacesServiceStatus.OK) {
                        console.log(results);
                        updatePlaces(results);
                    }
                })
            }
        }
    }),
)((props) => {
    return (
        <GoogleMap
            onTilesLoaded={props.fetchPlaces}
            ref={props.onMapMounted}
            onBoundsChanged={props.fetchPlaces}
            defaultZoom={8}
            defaultCenter={{ lat: 51.508530, lng: -0.076132 }}
        >
            {props.places && props.places.map((place, i) =>
                <Marker key={i} position={{ lat: place.geometry.location.lat(), lng: place.geometry.location.lng() }} />
            )}
        </GoogleMap>
    )
})

export default class MyFancyComponent extends React.PureComponent {
    render() {
        return (
            <MyMapComponent />
        )
    }
}

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