how to query data from javascript with ESP8266 ajax nodejs spiffs webserver and virtual joystick

this project controls an ESP8266 ESP-12E.
with webpages added via filesystem to 4M programmemory

files are images , javascript , ajax

in this demo a led is activated via ajax , no send command via a form is needed.

also the data from the virtual joystick is routed to the serial interface of the ESP-wifi module.

the virtual joystick emulates a X-Y-axis for mobile devices with touchscreen

also needed : data folder with filesystem files