位置更改时重新定位地图中心?

Question

嗨，伙计们，我正在使用react-google-maps库。每次我的位置更改时，我都会尝试重新定位我的地图(缩放标记所在的位置(，但我对如何实现整个事情有点迷茫。我可以看到标记正在更新，但地图停留在其defaultCenter位置。

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import {
GoogleMap,
Marker,
withScriptjs,
withGoogleMap
} from 'react-google-maps';
import environment from '../../config/environment';
class Map extends Component {
static propTypes = {
defaultZoom: PropTypes.number,
center: PropTypes.shape({
lat: PropTypes.number,
lng: PropTypes.number
}),
location: PropTypes.shape({
lat: PropTypes.number,
lng: PropTypes.number
}),
onPositionChanged: PropTypes.func
};
static defaultProps = {
defaultZoom: 14,
center: {
lat: 60.1699,
lng: 24.9384
},
location: {},
onPositionChanged: () => {}
};
constructor(props) {
super(props);
this.mapRef = React.createRef((ref) => {
this.mapRef = ref;
});
}
componenDidUpdate() {
console.log(`I'm about to update with props: ${JSON.strongify(prevProps, undefined, 2)}`);
}
onPositionChanged = (location) => {
console.log(`This the new location onPositionChange:${JSON.stringify(location, undefined, 2)}`);
const newLocation = new window.google.maps.LatLng(location.lat, location.lng);
// [NOTE]: try using the panTo() from googleMaps to recenter the map ? but don't know how to call it.
return (
<Marker
position={newLocation}
/>
);
}
render() {
const {
center,
defaultZoom,
location,
onPositionChanged
} = this.props;
return (
<GoogleMap
className="google-map"
onClick={onPositionChanged(location)}
defaultZoom={defaultZoom}
defaultCenter={center}
ref={this.mapRef}
>
{/* <Marker
position={location}
/> */}
{ this.onPositionChanged(location) }
</GoogleMap>
);
}
}
const SchedulerGoogleMap = withScriptjs(withGoogleMap(Map));
const SchedulerMap = props => (
<SchedulerGoogleMap
googleMapURL={`https://maps.googleapis.com/maps/api/js?key=${
environment.GOOGLE_MAPS_API_KEY
}&v=3`}
loadingElement={<div style={{ height: '20vh' }} />}
containerElement={<div style={{ height: '100%' }} />}
mapElement={<div style={{ height: '20vh', width: '100%' }} />}
{...props}
/>
);

export { Map, SchedulerMap, SchedulerGoogleMap };

Answer 1

只需将center道具传递给GoogleMap组件，而不是defaultCenter道具即可。center道具是可变的，而defaultZoom is not.

Answer 2

这似乎对我有用，以防万一任何其他人遇到同样的问题。

... ommited_code
class Map extends Component {
... ommited_code
componentDidUpdate(prevProps) {
if (prevProps.location !== this.props.location) {
this.mapRef.panTo(
new window.google.maps.LatLng(this.props.location.lat, this.props.location.lng)
);
}
}
render() {
const {
center,
defaultZoom,
location
} = this.props;
return (
<GoogleMap
className="google-map"
defaultZoom={defaultZoom}
defaultCenter={center}
ref={(ref) => {
this.mapRef = ref;
}}
>
<Marker position={new window.google.maps.LatLng(location.lat, location.lng)} />
</GoogleMap>
);
}
}
...ommited_code

Answer 3

panTo()是google.maps.Map class的一种方法 https://developers.google.com/maps/documentation/javascript/reference/map#Map.panTo。

它似乎是您正在寻找的函数，因此您需要通过引用您为地图设置的类名在谷歌地图上调用它，然后为panTo方法提供您创建LatLang对象：

window.google.maps.Map(document.getElementsByClassName("google-map")).panTo(newLocation);