HasValueListener
The HasValueListener
type describes a function that is used to listen to a Value
being added to or removed from the Store
.
(
store: Store,
valueId: Id,
hasValue: boolean,
): void
Type | Description | |
---|---|---|
store | Store | A reference to the |
valueId | Id | |
hasValue | boolean | Whether the |
returns | void | This has no return value. |
A HasValueListener
is provided when using the addHasValueListener
method. See that method for specific examples.
When called, a HasValueListener
is given a reference to the Store
and the Id
of Value
that changed. It is also given a flag to indicate whether the Value
now exists (having not done previously), or does not (having done so previously).
Since
v4.4.0