带有react-google-maps API的Google地图

我是地图的新手，我需要实现一条路线并获取距离.我正在使用react-google-map s API，并且发现了这种显示地图和路线的方法.

I'm new with maps and I need to implement a route and also get the distance. I'm using react-google-maps API and I have found this way to show the map, and the route.

这是我第一次构建这样的组件，但是现在我不知道如何访问类组件外部的数据.基本上，我想将搜索框(坐标)中的数据添加到DirectionService.route中的原点，并获取距离.您知道我该如何访问这些数据吗?

It is the first time that I build a component like this and now I don't know how to access the data that is outside the class component. Basically, I would like to add the data from the search box (coordinates) to the origin in the DirectionService.route, and also to get the distance. Do you know how can I access that data?

我一直在阅读不赞成使用componentWillMount的方法，但这是我使其工作的唯一途径，如果您有任何建议，我将很乐意尝试.

I've been reading that componentWillMount is being deprecated but it is the only way that I made it work, if you have any suggestions I'll be happy to try.

import React from 'react'
import  { compose, withProps, lifecycle } from 'recompose'
import {withScriptjs, withGoogleMap, GoogleMap, DirectionsRenderer} from 'react-google-maps'
const {
  StandaloneSearchBox
} = require("react-google-maps/lib/components/places/StandaloneSearchBox");

const DirectionsComponent = compose(
  withProps({
    googleMapURL: "https://maps.googleapis.com/maps/api/js?key='yourkey'&libraries=geometry,drawing,places",
    loadingElement: <div style={{ height: `400px` }} />,
    containerElement: <div style={{ width: `100%` }} />,
    mapElement: <div style={{height: `600px`, width: `600px` }}  />,
  }),
  
  withScriptjs,
  withGoogleMap,
  lifecycle({
    componentWillMount() {
      const refs = {};

      this.setState({
        places: [],
        onSearchBoxMounted: ref => {
          refs.searchBox = ref;
        },
        onPlacesChanged: () => {
          const places = refs.searchBox.getPlaces();
          console.log(places)

          this.setState({
            places
          });
        }
      });
    },

    componentDidMount() { 
      const google = window.google
      const DirectionsService = new google.maps.DirectionsService();

      DirectionsService.route({
        origin: new google.maps.LatLng(41.3851, -2.1734),
        destination: new google.maps.LatLng(40.4165, -3.70256),
        travelMode: google.maps.TravelMode.DRIVING,
      }, (result, status) => {
        console.log(result)
        if (status === google.maps.DirectionsStatus.OK) {
          this.setState({
            directions: {...result},
            markers: true
          })
          const distance = result.routes[0].legs[0].distance['text']
          console.log(distance)
        } else {
          console.error(`error fetching directions ${result}`);
        }
      });
    }
  })
)(props =>
  <div data-standalone-searchbox="">
    <StandaloneSearchBox
      ref={props.onSearchBoxMounted}
      bounds={props.bounds}
      onPlacesChanged={props.onPlacesChanged}
    >
      <input
        type="text"
        placeholder="Enter your destination"
        style={{
          boxSizing: `border-box`,
          border: `1px solid transparent`,
          width: `240px`,
          height: `32px`,
          padding: `0 12px`,
          borderRadius: `3px`,
          boxShadow: `0 2px 6px rgba(0, 0, 0, 0.3)`,
          fontSize: `14px`,
          outline: `none`,
          textOverflow: `ellipses`
        }}
      />
    </StandaloneSearchBox>
    <ol>
      {props.places.map(
        ({ place_id, formatted_address, geometry: { location } }) => (
          <li key={place_id}>
            {formatted_address}
            {" at "}
            ({location.lat()}, {location.lng()})
          </li>
        )
      )}
    </ol>

  <GoogleMap defaultZoom={3}>
    {props.directions && <DirectionsRenderer directions={props.directions} suppressMarkers={props.markers} />}
  </GoogleMap>
</div>
  
);

class MyMapComponent extends React.PureComponent {
  constructor(props) {
    super(props)
    console.log(props)
    this.state = {

    }
  }
  

render() {
    return (
      <div>
        
        <DirectionsComponent/>
      </div>
      
    )
  }
}
export default MyMapComponent

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