How to implement cascading drop down in Constellation – Pega 24.2

This is a Simple POC to implement Cascading drop down. Prior to constellation we used to do a lot of coding to implement this. But now it is just few configurations.

1. Create a Data Type say CountryState with fields Type, Key, Parent Key
2. Create records – if we select a particular Country then its corresponding State will be displayed.

There are 3 data pages created

D_CountryState, D_CountryStateList and D_CountryStateSavable but to get the Data view properties while configuring the country and state field in the Data model tab of the case type we need pass the parameter Type and ParentKey

Go to the Parameters tab

Report definition

Now go the App studio — open the case type Demo project and go to the Data model tab and create two picklist properties – Country and State.

Go to Data model and create a picklist field Country – Display as – Drop down list, Picklist options – Data page

select the Data page – CountryState – List CountryState

Create another picklist property State and configure it as of Country but here parent key should be Field and the value should be country – because we need to populate the States as per the selected Country

Now go to the case type – add an assignment – Select Country – State

Click Configure view – add the two fields country and state that we have added in the case type data model tab

Click gear icon of the Country

Enter the Helper text

For the State use a custom logic for the visibility – if Country is not null

Testing

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