Best practice for AJAX quieries

As long as you check in your controllers for an Ajax request you should be ok.

PHP Code:

// Check for AJAX request.
if ($request->isAJAX())
{
        . . .
} 


Yes it's good for minimal AJAX queries, but I have controllers with example 5-10 Ajax actions, and somethink like this:

PHP Code:

if($request->isAJAX()) {
    switch($task) {
        case 'action1':
                /**
                 * When action have many lines it's very hard to work fine with this
                 */
            break;
        case 'action1':
            break;
        case 'action2':
            break;
        case 'action3':
            break;
        case 'action4':
            break;
        case 'action5':
            break;
        ....
    }
} 


So, I start thinking about declare Other Controller (namspace?) for AJAX. Ex.: method names as actions and resolve this to maybe better way.