API Reference > imodeljs-backend > Elements > OnChildElementIdArg OnChildElementIdArg Interface Beta Argument for the Element.onChildXxx static methods that only supply the Id of the child Element. Extends OnChildElementArg Properties Name Type Description childId string The Id of the child element for this method Inherited properties Name Type Inherited from Description iModel IModelDb OnChildElementArg The iModel for the Element affected by this method. parentId string OnChildElementArg Defined in core/backend/src/Element.ts Line 70 Last Updated: 11 June, 2024