在 google-map-react 上动态添加标记

Question

What I wan't to do is to show the location picked from some mobile devices on the Map. Data about the locations are there..

What I need here is to add Markers on the map depending on the data received from the server.

Assume I have set the location data ({Lat,Lang}) to the state markers Then How can I add this to show in Map.

My Map Code is as follows!

 import React, { Component } from 'react'; import GoogleMapReact from 'google-map-react'; const AnyReactComponent = ({ text }) => <div>{text}</div>; class MyClass extends Component { constructor(props){ super(props); } render() { return ( <GoogleMapReact defaultCenter={this.props.center} defaultZoom={this.props.zoom} style={{height: '300px'}} > <AnyReactComponent lat={59.955413} lng={30.337844} text={'Google Map'} /> </GoogleMapReact> ); } } MyClass.defaultProps = { center: {lat: 59.95, lng: 30.33}, zoom: 11 }; export default MyClass;

This Code is from the answer Implementing google maps with react

Used npm package :- google-map-react

Answer 1

You may try:

import React, { Component } from 'react';
import GoogleMapReact from 'google-map-react';

const AnyReactComponent = ({  img_src }) => <div><img src={img_src} className="YOUR-CLASS-NAME" style={{}} /></div>;

class MyClass extends Component {
  constructor(props){
    super(props);
    this.state = {
        markers: [],
    }
  }

  componentDidMount(){
    // or you can set markers list somewhere else
    // please also set your correct lat & lng
    // you may only use 1 image for all markers, if then, remove the img_src attribute ^^
    this.setState({
      markers: [{lat: xxxx, lng: xxxx, img_src: 'YOUR-IMG-SRC'},{lat: xxxx, lng: xxxx, img_src: 'YOUR-IMG-SRC' },{lat: xxxx, lng: xxxx,  img_src: 'YOUR-IMG-SRC'}],
    });
  }

  render() {
    return (
      <GoogleMapReact
        defaultCenter={this.props.center}
        defaultZoom={this.props.zoom}
        style={{height: '300px'}}
      >
            {this.state.markers.map((marker, i) =>{
              return(
                <AnyReactComponent
                  lat={marker.lat}
                  lng={marker.lng}
                  img_src={marker.img_src}
                />

              )
            })}      
      </GoogleMapReact>
    );
  }
}
MyClass.defaultProps = {
  center: {lat: 59.95, lng: 30.33},
  zoom: 11
};

If this has error, please show here too, then we can fix it later

===========

ADDED EXAMPLE FOR CLICK-EVENT ON MARKERS

 markerClicked(marker) {
   console.log("The marker that was clicked is", marker);
   // you may do many things with the "marker" object, please see more on tutorial of the library's author:
  // https://github.com/istarkov/google-map-react/blob/master/API.md#onchildclick-func 
  // Look at their examples and you may have some ideas, you can also have the hover effect on markers, but it's a bit more complicated I think 
 }

 render() {
    return (
      <GoogleMapReact
        defaultCenter={this.props.center}
        defaultZoom={this.props.zoom}
        style={{height: '300px'}}
      >
            {this.state.markers.map((marker, i) =>{
              return(
                <AnyReactComponent
                  lat={marker.lat}
                  lng={marker.lng}
                  img_src={marker.img_src}
                  onChildClick={this.markerClicked.bind(this, marker)}
                />

              )
            })}      

      </GoogleMapReact>
    );
  }

Once again, post here some errors if any ^^ !

Answer 2

Be careful. You said react-google-map but you are using google-map-react . Those are 2 different packages. Do not mix up their documentation.