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How to populate some values from standard object fields to custom object fields?

Hi Developers,

                        I hope my question is clearly to all. In a custom object I have an account lookup field. when I select account, I need some values auto populate from account. 


I did this from a trigger, but these values are populating after saving. But, I need when i selected an account at that time i need this values populated into related fields of custom object.


How can i do this?



Hi Sreenath,

In this case you will need to use the Javascript (Action function method) which should call the Controller method and rerender that area to reflect the fields of Account.