Final answer:
To show a field in a Drupal webform based on the answer to a previous question, use the Conditional Fields module to set up conditional logic rules.
Step-by-step explanation:
To show a field in a Drupal webform depending on the answer to a previous question, you can use the Conditional Fields module. This module allows you to set up conditional logic rules to determine when a field should be shown or hidden based on the response to another field.
First, install and enable the Conditional Fields module. Then, edit the webform you want to add conditional logic to. Under the 'Manage fields' tab, click on the 'Edit' button next to the field you want to conditionally show or hide. In the field settings, you will find a section called 'Conditional rules' where you can define your logic.
For example, let's say you have a yes/no question asking if the user has a pet. If the answer is 'Yes', you want to show an additional field asking for the pet's name. In this case, you would set up a conditional rule that states 'Show this field if the answer to the previous question is Yes'.
Learn more about Drupal webforms conditional logic