API Reference > imodeljs-backend > Elements > Element > onChildDrop onChildDrop MethodProtectedStatic Beta Called when an element with an instance of this class as its parent is about to be updated change to a different parent. onChildDrop(_arg: OnChildElementIdArg): void note throw an exception if the element should not be dropped note this is the class of the parent Element. Parameter Type Description _arg OnChildElementIdArg Returns - void Defined in core/backend/src/Element.ts Line 314 Last Updated: 11 June, 2024