I'm trying to change some things on a map that is already initialised by another script, using the Leaflet library. This other script did not store the map-object in a global variable, or in any other location I can access with my script. So currently there is a map on my page, but I don't have the map object.
What I'd like to do is to retrieve the object of an already-initialised map, to make changes to it. For example, if there'd exist a function L.getMap('myID') I'd like to use such a method to retrieve the map object linked to the container myID.
TL;DR: Is there a way to get a map object of an already-initialised leaflet map, using the id of the container?
You can access the map from the global array created by the mediawiki extension.
Es: for accessing the first map of the page
window.maps.leafletList[0].map.getCenter()
For the record, in case you have the possibility to inject / execute some JS code before the map is initialized (i.e. before the "other script" executes), you can very easily customize Leaflet to keep a reference to each created maps.
E.g. using the addInitHook constructor hook on L.Map class:
// Before map is being initialized.
var mapsPlaceholder = [];
L.Map.addInitHook(function () {
mapsPlaceholder.push(this); // Use whatever global scope variable you like.
});
// "Other script", can be in its own separate <script> and JS file.
L.map('mapId'); // The map object is pushed into `mapsPlaceholder` array.
// Then retrieve the map object to further manipulate the map.
var map = mapsPlaceholder.pop();
来源：https://stackoverflow.com/questions/45412056/find-leaflet-map-object-after-initialisation