AJAX / Post / delete record not working

Did you try :

Code:

if($id == ""){
            $response = [
                'success' => 0,
                'msg' => "No Task To Delete",
            ];
            echo json_encode($response);
        } else {
            $task = new TaskModel();
            $task->task_delete($id);
            $response = [
                'success' => 1,
                'msg' => "Task Deleted",
            ];
            echo json_encode($response);
        }

So the problem is I cannot get see any $_POST head info and also cannot see $id in headers.  It isn't a logic error, I think.  I tried about but as $id is blank it is always "No task to delete".

In your Ajax call your dataType is 'json'. However the CONTENT_TYPE may not be correct in the header. Try replacing $request->getVar('id') with $request->getJsonVar('id')