Methods, devices and systems for providing a user interface in an on-demand software service environment are described. Some implementations involve displaying a rendered page, detecting the firing of an event in the rendered page and determining an event type for the event. The implementations may also involve ascertaining whether an action associated with the event is implemented in a server-side language or a client-side language, locating handlers for the event according to the event type and performing a handler execution process. These implementations may also involve executing a component re-rendering process to create a re-rendered page and displaying the re-rendered page. The component re-rendering process may be based, at least in part, on output from the handler execution process.