类型错误： 无法再次读取未定义的属性'maps'

Question

我收到这个错误"TypeError:无法读取未定义的属性‘maps’"，这表明这一行有问题

controlPosition={google.maps.ControlPosition.TOP_LEFT}

这是我的密码。请帮忙！！！

import React from "react";
const _ = require("lodash");
const { compose, withProps, lifecycle } = require("recompose");
const {
withScriptjs,
withGoogleMap,
GoogleMap,
Marker,
google,
} = require("react-google-maps");
const { SearchBox } = require("react-google-maps/lib/components/places/SearchBox");
const SimpleMap = compose(
withProps({
googleMapURL: "https://maps.googleapis.com/maps/api/js?key=MY_KEY&v=3.exp&libraries=geometry,drawing,places",
loadingElement: <div style={{ height: `200%` }} />,
containerElement: <div style={{ height: `500px` }} />,
mapElement: <div style={{ height: `100%` }} />,
}),
lifecycle({
componentWillMount() {
const refs = {}
this.setState({
bounds: null,
center: {
lat: 34.4208, lng: -119.6982 
},
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>
);
export default SimpleMap;

Answer 1

您确定react-google-maps包导出google对象吗？。我只是快速查看了他们的回购协议，他们似乎没有导出google成员(看看这里(。如果他们不导出google，那么下面的导入就是问题所在。

const {
withScriptjs,
withGoogleMap,
GoogleMap,
Marker,
google, // this is invalid - there is no 'google' available
} = require("react-google-maps");

Answer 2

只需像这样添加window.google.maps就可以了。

controlPosition = { window.google.maps.ControlPosition.TOP_LEFT }