refresh leaflet map: map container is already initialized
JavascriptLeafletJavascript Problem Overview
I have a page where given a select to the user he can switch the leaflet map I show.
After a initial leaflet map load, my problem is when i want to refresh the map.
I always get "Map container is already initialized":
The problem line is:
var map = L.map('mapa').setView([lat, lon], 15);
Initially it loads well, but when I select another parameter in the form and want to display the map another time it crashes.
btw, I've tried to destroy and recreate $('#mapa')
with jQuery before the second setView()
but it shows the same error.
Javascript Solutions
Solution 1 - Javascript
Try map.remove();
before you try to reload the map. This removes the previous map element using Leaflet's library (instead of jquery's).
Solution 2 - Javascript
the best way
map.off();
map.remove();
You should add map.off(), it also works faster, and does not cause problems with the events
Solution 3 - Javascript
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.
Solution 4 - Javascript
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;
}
Solution 5 - Javascript
Solution 6 - Javascript
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;
}
map.invalidateSize();
It works for me
Solution 7 - Javascript
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 :-)
Solution 8 - Javascript
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");
}
Solution 9 - Javascript
What you can try is to remove the map before initialising it or when you leave the page:
if(this.map) {
this.map.remove();
}
Solution 10 - Javascript
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.
Solution 11 - Javascript
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: '© <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);
Solution 12 - Javascript
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.
Solution 13 - Javascript
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
}
Solution 14 - Javascript
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>
);
}
Solution 15 - Javascript
use the redrawAll() function rather than renderAll().
Solution 16 - Javascript
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.
Solution 17 - Javascript
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.
Solution 18 - Javascript
For refresh leaflet map you can use this code:
this.map.fitBounds(this.map.getBounds());
Solution 19 - Javascript
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>
);
Solution 20 - Javascript
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();
Solution 21 - Javascript
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);
}
Solution 22 - Javascript
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);
}
Solution 23 - Javascript
set
var container = L.DomUtil.get('map');
if (container['_leaflet_id'] != null) {
container.remove();
}
before var map = L.map('map')
enjoy :)
Solution 24 - Javascript
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]);
}