Request for `tileLayer.whenLoaded` function

Is your feature request related to a problem? Please describe. My use case:

1. Start flyTo programmatically to another location in the map
2. Wait for the tiles in the new location to be loaded, then do X.

Currently I can only rely on tileLayer.on("load", function(){}). However, when the new location is already loaded in the beginning (e.g., when the new location is nearby), there is nothing I can use to inform step 2 that X can now be done (“load” event won’t fire since the map is already loaded).

I cannot just rely on “moveend” or “zoomend”, since by the time we reach the new location, the new location might not finish loading yet.

Describe the solution you’d like Just like map.whenReady function, which fires immediately when the map is set, I would like to have tileLayer.whenLoaded function, which fires immediately if the visible tile layer is already loaded.

Describe alternatives you’ve considered

1. Putting X only on “moveend” or “zoomend” doesn’t guarantee that the visible tile is loaded.
2. Putting X only on tileLayer.on("load") doesn’t guarantee that it will fire.

[johnd0e]

Is there any advantage of doing this using lower level checks (this._loading) versus a higher-level one (isLoading())?

There is no real advantage. As a rule we use private properties (_loading) in Leaflet’s own code, but in client code (or plugins) public method is preferable. Reason: private property can be changed in future version without notification, why public one is part of API, and thus more stable.

[justhalf]

Thanks for the response!

This seems similar to the solution we found here: https://stackoverflow.com/questions/66382098/does-there-exist-a-function-to-tell-if-the-current-tilelayer-is-already-load

Is there any advantage of doing this using lower level checks (this._loading) versus a higher-level one (isLoading())?