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Visualforce Developer's Guide by W.A.Chamil Madusanka

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Custom controllers and controller extensions

Custom controllers are used to implement the logic and functionality without using a standard controller and controller extensions are used to extend the logic and functionality of a standard controller or a custom controller. Custom controllers and Controller extension are written using Apex.

Understanding custom controllers

Custom controllers are used to implement logic and functionality without using a standard controller. Custom controllers are written using Apex. The following are the instances where you might want to use use a custom controller:

  • Implement a completely different functionality without relying on the standard controller's behavior
  • Override existing functionality
  • Make new actions for the ...

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