How to convert a map location (lat, lng) pair to a screen position (x, y) pair in mapbox

Question

I am using mapbox javascript API to do some cool stuff on a map. Now I have a map location (latitude, longitude) pair and I want to set the view to this location then use javascript to simulate a click at this location. The problem is that I need to find out the screen position (x, y) pair of this location after setting the view. But how do I do that?

It seems there is an API L.ICRS. I tried but it returned NaN for both x and y -- please check my example javascript codes below.

var latlng = [40.444621, -79.943231]
map.setView(latlng, 13);
L.CRS.EPSG3857.latLngToPoint(latlng, 13);

Can anybody help me on that? My final goal is to simulate a click at that position.

Thank you very much!

Answer 1

Mapbox.js

Use the latLngToContainerPoint method off of the map object.

Mapbox GL JS

project is the equivalent function for GL.