calling the right method after ajax call

[eluser]stoefln[/eluser]
maybe my question is not as complete as it should. determining the location is acutally not a big problem: i can call $this->uri->segment(3) to get the method where the current view was rendered. but i have to do a switch($this->uri->segment(3)), that means i have to do a manually routing of methods and parameters. thats something what CI usually does for me. isnt there a more generic way, maybee using the routing functionallity of CI?