I am using Drupal 7 with the Entityform and Conditional Fields modules to build a form and need to see if it is possible to disable a value in one field based on the selected value of another field. Here are the details:
Field: Source Region List (Text) - Radio Buttons
Values: US-East US-West APJ EMEA
Field: Destination Region List (Text) - Radio Buttons
Values: US-East US-West APJ EMEA
The behavior I am looking for is this: When a region value in Source Region is selected, I need the corresponding value in Destination Region to be disabled but the rest of the values to be selectable. This is to make sure the Source and Destination regions are not set to the same value.
Example: Source Region selected value is US-East, I need Destination Region US-East gets disabled.
If this is not possible with the Entityform and Conditional Fields modules, please let me know how best to obtain this functionality. If this means writing a form from scratch, I am willing to do this but need some type of tutorial or howto document to learn how to do this.