Question
Maantic Global IT Solutions Pvt. Ltd
IN
Last activity: 9 Jul 2025 19:20 EDT
Validate Page List property (e.g., .ProductList) is empty at validate rule like other single value properties
I am working on a validation scenario where I need to check if a Page List property (e.g., .ProductList) is empty, and if so, display an appropriate error message to the user.
I would like to implement this using a Validate rule, not an activity or data transform. However, when I try to add the Page List in the Validate rule, it prompts me to reference another Validate rule for the list items.
Could you please guide me on:
Maantic Inc
IN
HCA Healthcare
US
@SanjibMajiIn Pega, if you want to check whether a Page List property like .ProductList is empty using a Validate rule, you can’t directly validate the list itself like you do with single value properties. When you try to add the Page List in a Validate rule, Pega asks for another Validate rule to apply to each item in the list. However, to check if the list is completely empty, you can use a Java expression in the Validate rule like tools.sizeOfProperty(".ProductList") == 0. This checks if the list has zero items. If it’s empty, you can then show a custom error message like “Product list must not be empty.” Another way is to create a When rule that checks if the first item in the list is blank using .ProductList(1) == null and use that in the Validate rule. Both approaches help you show a clear message when no items are added to the list.
@SanjibMaji
Yes in a validate rule if a pagelist is referred, you have to set another validate rule that'll run for each index in the pagelist. Instead of referring the pagelist property, refer any other property that is not on the UI and use a expression to evaluate your condition. The validate rule will through a page-set-message on the UI.