We have a custom entity with Zipcode, County, State names Cust_Zipcode (Data already loaded)
Now, When the user enters zip code in an Account Record and saves that record, The county field should be populated with the County Name from the custom entity cust_zipcode (It should have to lookup the custom entity and populate the county based on zipcode field).
I am in need of javascript (For Onload or OnSave) to perform this.
Any Help????????