To create a cascading dropdown in Pega, you can follow these steps:
- Create two properties in your application data model to store the values for the dropdown lists. For example, you might have a property for the first dropdown list named “Category” and a property for the second dropdown list named “Subcategory”.
- In the form where you want to display the cascading dropdown, add two dropdown controls and bind them to the “Category” and “Subcategory” properties, respectively.
- In the first dropdown control, set the “On Change” event to a flow action that will load the values for the second dropdown list based on the selected value of the first dropdown.
- In the flow action, retrieve the list of subcategories from the database or from a local list and set the values as the options for the second dropdown control. You can use the “SetOptions” method of the “Control” class to set the options for the second dropdown.
Here is an example of code that you can use in the flow action to set the options for the second dropdown control:
/* Retrieve the list of subcategories from the database or from a local list */
List<String> subcategories = retrieveSubcategories(Category);
/* Set the options for the second dropdown control */