API Reference > imodeljs-backend > Elements > Element > onChildUpdate onChildUpdate MethodProtectedStatic Beta Called when an element with an instance of this class as its parent is about to be updated. onChildUpdate(_arg: OnChildElementPropsArg): void note throw an exception if the element should not be updated note this is the class of the parent Element. Parameter Type Description _arg OnChildElementPropsArg Returns - void Defined in core/backend/src/Element.ts Line 288 Last Updated: 12 June, 2024