刷新传单映射: 映射容器已初始化

Try map.remove(); before you try to reload the map. This removes the previous map element using Leaflet's library (instead of jquery's).

well, after much seeking i realized it's well documented at http://leafletjs.com/examples/layers-control.html

i've ended not repainting the map, but print it once and repaint the points on each new ajax call, so the problem was how to clean up the old points and print only the new ones. i've ended doing this:

var point = L.marker([new_marker[0], new_marker[1]]).addTo(map).bindPopup('blah blah');
points.push(point);
//points is a temporary array where i store the points for removing them afterwards

so, at each new ajax call, before painting the new points, i do the following:

for (i=0;i<points.length;i++) {
map.removeLayer(points[i]);
}
points=[];

so far, so good :-)

Html:

<div id="weathermap"></div>

JavaScript:

function buildMap(lat,lon)  {
document.getElementById('weathermap').innerHTML = "<div id='map' style='width: 100%; height: 100%;'></div>";
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
osmAttribution = 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors,' +
' <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>',
osmLayer = new L.TileLayer(osmUrl, {maxZoom: 18, attribution: osmAttribution});
var map = new L.Map('map');
map.setView(new L.LatLng(lat,lon), 9 );
map.addLayer(osmLayer);
var validatorsLayer = new OsmJs.Weather.LeafletLayer({lang: 'en'});
map.addLayer(validatorsLayer);
}

I use this:

document.getElementById('weathermap').innerHTML = "<div id='map' style='width: 100%; height: 100%;'></div>";

to reload content of div where render map.

I had same problem.then i set globally map variable e.g var map= null and then for display map i check

if(map==null)then map=new L.Map('idopenstreet').setView();

By this solution your map will be initialize only first time after that map will be fill by L.Map then it will not be null. so no error will be there like map container already initialize.

the best way

map.off();
map.remove();

You should add map.off(), it also works faster, and does not cause problems with the events

When you just remove a map, it destroys the div id reference, so, after remove() you need to build again the div where the map will be displayed, in order to avoid the "Uncaught Error: Map container not found".

if(map != undefined || map != null){
map.remove();
$("#map").html("");
$("#preMap").empty();
$( "<div id=\"map\" style=\"height: 500px;\"></div>" ).appendTo("#preMap");
}

use the redrawAll() function rather than renderAll().

Before initializing map check for is the map is already initiated or not

var container = L.DomUtil.get('map');
if(container != null){
container._leaflet_id = null;
}

I had the same problem on angular when switching page. I had to add this code before leaving the page to make it works:

    $scope.$on('$locationChangeStart', function( event ) {
if(map != undefined)
{
map.remove();
map = undefined
document.getElementById('mapLayer').innerHTML = "";
}
});

Without document.getElementById('mapLayer').innerHTML = "" the map was not displayed on the next page.

Only use this

map.invalidateSize();

https://github.com/Leaflet/Leaflet/issues/690

What you can try is to remove the map before initialising it or when you leave the page:

if(this.map) {
this.map.remove();
}

We facing this issue today and we solved it. what we do ?

leaflet map load div is below.

<div id="map_container">
<div id="listing_map" class="right_listing"></div>
</div>

When form input change or submit we follow this step below. after leaflet map container removed in my page and create new again.

$( '#map_container' ).html( ' ' ).append( '<div id="listing_map" class="right_listing"></div>' );

After this code my leaflet map is working fine with form filter to reload again.

Thank you.

if you want update map view, for example change map center, you don’t have to delete and then recreate the map, you can just update coordinate

const mapInit = () => {
let map.current = w.L.map('map');


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


const setCoordinate = (gps_lat, gps_long) => {
map.setView([gps_lat, gps_long], 13);
}


initMap();


setCoordinate(50.403723 30.623538);


setTimeout(() => {
setCoordinate(51.505, -0.09);
}, 3000);

If you don't globally store your map object reference, I recommend

if (L.DomUtil.get('map-canvas') !== undefined) {
L.DomUtil.get('map-canvas')._leaflet_id = null;
}

where <div id="map-canvas"></div> is the object the map has been drawn into.

This way you avoid recreating the html element, which would happen, were you to remove() it.

For refresh leaflet map you can use this code:

this.map.fitBounds(this.map.getBounds());

For refreshing map in same page you can use below code to create a map on the page

if (!map) {
this.map = new L.map("mapDiv", {
center: [24.7136, 46.6753],
zoom: 5,
renderer: L.canvas(),
attributionControl: true,
});
}

then use below line to refresh the map, but make sure to use same latitude, longitude and zoom options

map.setView([24.7136, 46.6753], 5);

Also, I had the same issue when switching between tabs in the same page using angular 2+, and I was able to fix it by adding below code in Component constructor

var container = L.DomUtil.get('mapDiv');
if (container != null) {
container.outerHTML = ""; // Clear map generated HTML
// container._leaflet_id = null; << didn't work for me
}

You should try to unmount the function in react js to remove the existing map.

const Map = () => {


const mapContainer = useRef();
const [map, setMap] = useState({});


useEffect(()=>{
const map = L.map(mapContainer.current, {attributionControl: false}).setView([51.505, -0.09], 13);


L.tileLayer('https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
attribution: 'Map',
id: 'mapbox/streets-v11',
tileSize: 512,
zoomOffset: -1
}).addTo(map);


// unmount map function
return () => map.remove();
}, []);


return (
<div style=\{\{padding: 0, margin: 0, width: "100%", height: "100vh",}}
ref={el => mapContainer.current = el}>
</div>
);
}

I had the same problem on react I solved it by initialized at the top in useEffect Here is my React Code.

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>
);

I went through the same problem, so I created a method inside the map instance to reload it.

var map = L.map('mapa').setView([lat, lon], 15);
map.reload = function(){
map.remove();
map = L.map('mapa').setView([lat, lon], 15);
}


....


map.reload();

I did this in reactjs

// Create map (dev = reuse existing map)
let myMap = L.DomUtil.get('map');
if(myMap == null){
myMap = L.map('mapid').setView(currentLocation, zoom);
}

Html:

<div id='leaflet-map' #leafletMap></div>

JavaScript:

@ViewChild('leafletMap')
private mapElement: ElementRef;


private initMap(): void {
this.map = leaflet.map(this.mapElement.nativeElement, {
center: [39.01860177826393, 35.30274319309024],
zoom: 4,
});


leaflet
.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '',
maxZoom: 18,
})
.addTo(this.map);
}

set

    var container = L.DomUtil.get('map');
if (container['_leaflet_id'] != null) {
container.remove();
}

before var map = L.map('map')

enjoy :)

My hacky implementation to refresh the map was to use:

  // Hack to refresh the map by panning by zero
public refreshMap() {
this.map.panBy([0,0]);
}

In case you're working with NextJs and typescrypt, what worked for me was

container._leaflet_id = null;

as someone proposed, but had some typing erros so my approach is

const L = await import('leaflet');
const container = L.DomUtil.get('map');
if (!container) return;
if (container.classList.contains('leaflet-container')) return;
const map = L.map('map', {
center: [19.434817, -99.1268643],
zoom: 18,
});
map.invalidateSize();
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 19,
}).addTo(map);
const marker = L.marker([19.434786638353515, -99.1268643025101]).addTo(
map
);

after this code, (all these code needs to be inside a useEffect hook), leaflet just worked fine.

Pass the actual HTML map element when initiating Leaflet map

When initiating Leaflet map, pass the actual HTML element instead of just the string id.

Both methods are officially supported, but I cannot find any information talking about the differences. https://leafletjs.com/reference.html#map-l-map

Passing the element (instead of string id) seems to have cleared up "map container is already initialized" errors during development using Leaflet and Nuxt (with hot reload and everything else).

<div id="mymap"></div>

BEFORE

This works in general and is convenient...

this.map = L.map("mymap")

AFTER

... but, instead try to actually get the element, and pass it.

let myMapElement = document.getElementById("mymap")
this.map = L.map(myMapElement)