46

我有下面的反应类,它通过浏览器获取地理位置。

我正在绘制一张传单地图。我想将地理定位作为 setView 的输入,以便地图“缩放”到客户端浏览器位置的区域。

这是反应类:

    import React from 'react';
    import L from 'leaflet';
    import countries from './countries.js'; 

    var Worldmap = React.createClass({

        render: function() {

            let geolocation = [];

            navigator.geolocation.getCurrentPosition(function(position) {
                let lat = position.coords.latitude;
                let lon = position.coords.longitude;
                geolocation.push(lat, lon);
                locationCode()
            });

            function locationCode() {
                if(geolocation.length <= 0)
                    geolocation.push(0, 0);
            }


            let map = L.map('leafletmap').setView(geolocation, 3);

            L.geoJSON(countries, {
                style: function(feature) {
                    return {
                        fillColor: "#FFBB78",
                        fillOpacity: 0.6,
                        stroke: true,
                        color: "black",
                        weight: 2
                    };
                }
            }).bindPopup(function(layer) {
                return layer.feature.properties.name;
            }).addTo(map);

            return (
                <div id="leafletmap" style={{width: "100%", height: "800px" }}/>
            )
        }
    });

    export default Worldmap

它在 HTML 呈现为<WorldMap />.

Uncaught Error: Map container not found.加载页面时出现错误。环顾四周,通常是因为地图试图在提供值之前显示在 div 中(在这种情况下为 (gelocation, 3))。但是,它不应该在从下面的渲染函数返回之前显示它。

可能是什么问题?

在控制台中打印出geolocation正确获取坐标,所以这似乎不是问题。

4

6 回答 6

79

<div id="leafletmap">必须在调用之前添加到domL.map('leafletmap')

于 2017-03-07T12:09:03.070 回答
7

除了@IvanSanchez 的回复,您还可以将地理位置和 L.map(...) 代码添加到 componentDidMount() React 生命周期方法(取决于您希望实现的其他目标)。您还可以为找到的位置创建和绑定事件处理程序。

这种方式肯定是加了dom和leaflet才能找到的。

如果仍然不清楚,很乐意提供帮助。

于 2017-07-17T10:37:38.840 回答
2

如果您使用 Angular,我希望这会有所帮助:

const container = document.getElementById('map')
if(container) {
    // code to render map here...
}
于 2020-02-20T14:38:38.200 回答
1

我在反应时遇到了同样的问题我通过在 useEeffect 的顶部初始化解决了它这是我的反应代码。

  const  mapContainerRef = useRef(null), 
  useEffect( async () => {
  const res =await Axios.get(BASE_PATH + 'fetchProperty')

  const container = L.DomUtil.get(mapContainerRef.current); if(container != null){ container._leaflet_id = null; }

  if(container) {


  const mapView = L.map( mapContainerRef.current, {
    zoom: 13,
    center: [19.059984, 72.889999]
    //  maxZoom: 13
    // minZoom: 15
  });
  // const canvas = mapView.getCanvasContainer();
  mapView.zoomControl.setPosition("bottomright");
  mapView.attributionControl.addAttribution(
    "<a href='https://mascots.pro'>Mascots. pro</a>"
  );
  L.tileLayer(
    // "https://api.mapbox.com/styles/v1/mapbox/dark-v9/tiles/{z}/{x}/{y}?access_token=" + https://api.mapbox.com/styles/v1/anonymousmw/cko1eb1r20mdu18qqtps8i03p/tiles/{z}/{x}/{y}?access_token=
    "https://api.mapbox.com/styles/v1/mapbox/dark-v9/tiles/{z}/{x}/{y}?access_token=" +
      access_token,
    {
      attribution: '<a href="http://mascots.work">Mascots</a>'
    }
  ).addTo(mapView);

  const mask = L.tileLayer.mask(
    "https://api.mapbox.com/styles/v1/anonymousmw/cko1eb1r20mdu18qqtps8i03p/tiles/{z}/{x}/{y}?access_token=" +
      access_token,
    {
      attribution: '<a href="https://mascots.pro">Mascots pro</a>',
      maskSize: 300
      // maxZoom: 18,
      // maxNativeZoom: 16
      // tms: true
    }
  )
  .addTo(mapView);

  mapView.on("mousemove", function (e) {
    mask.setCenter(e.containerPoint);
  });
  res.data.map((marker) => {
  
    const innerHtmlContent = `<div id='popup-container' class='popup-container'> <h3> Property Details</h3>
    <div class='popup-label'>Building Name :<p>${marker.Building}</p></div>
    <div class='popup-address-label'> Address : <p>${marker.Landmark}, ${marker.Location}</p></div>
    <div class='popup-rent-label'>Monthly Rent : <p> ₹ ${marker.Price}</p></div>
    </div>`;
    const divElement = document.createElement("div");
    const assignBtn = document.createElement("div");
    assignBtn.className = "map-link";
    assignBtn.innerHTML = `<button class="view-btn">View Property</button>`;
    divElement.innerHTML = innerHtmlContent;
    divElement.appendChild(assignBtn);
    assignBtn.addEventListener("click", (e) => {
      console.log("dsvsdvb");
    });
    var iconOptions = {
      iconUrl: "/images/location_pin2.svg",
      iconSize: [25, 25]
    };
    var customIcon = L.icon(iconOptions);

    // create popup contents
    var customPopup = divElement;

    // specify popup options
    var customOptions = {
      maxWidth: "500",
      className: "custom"
    };

    const markerOptions = {
      // title: "MyLocation",
      //    draggable: true
      clickable: true,
      icon: customIcon
    };
    const mark = L.marker([marker.Latitude,marker.Longitude], markerOptions);
    mark.bindPopup(customPopup, customOptions);
    mark.addTo(mapView);
    // return mapView.off();
   
  });
  return () => mapView.remove();
}
}, [])

return (
  <div className="map-box">
        <div className="map-container" ref={mapContainerRef}></div>
    </div>
);

}

于 2021-05-11T12:36:00.940 回答
1

导致的错误

div id="map" 必须在调用 L.map('map') 之前添加到 dom。

解决方案是使用:

         useEffect(() => {

这是我的工作 app.js :

           import React, { useState, useEffect } from 'react';



           import './App.css';

           import L from 'leaflet';
           import 'leaflet/dist/leaflet.css';


           function App() {






          // Similar to componentDidMount and componentDidUpdate:
          useEffect(() => {



                              let current_lat = 28.625789;
                              let current_long = 77.0547899;
                              let current_zoom = 16;
                              let center_lat = current_lat;
                              let center_long = current_long;
                              let center_zoom = current_zoom;




                              // The <div id="map"> must be added to the dom before calling L.map('map')
                                let map = L.map('map', {
                                  center: [center_lat, center_long],
                                  zoom: center_zoom
                                });

                                L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
                                  attribution: '&copy; <a href="https://openstreetmap.org/copyright">OpenStreetMap</a> contributors'
                                }).addTo(map);



          });





                  return (


              

                                <div class="right-sidebar-container">
                                        
                                  <div id="map">

                                  </div>
                                
                              </div>

                  );





         } // app







     export default App;
于 2021-05-21T18:40:37.173 回答
0

在 Angular 中,我必须将它放在 ngAfterViewInit 中,如下所示:

ngAfterViewInit() {
    this.mymap = L.map('mapid').setView([51.505, -0.09], 13);
}

在我的“view.component.ts”导出类中

于 2021-03-09T20:16:38.400 回答