AbstractProtected Readonly_Protected Readonly_Protected Readonly_Protected Readonly_Protected Readonly_Protected Optional_Protected Readonly_Exposes the tree context consumer so subclasses can call .asPromise() on it.
Protected Readonly_ReadonlydrillableWhether opening this item takes the user into it, as answered by the tree — it is a property of the tree's host, the same for every item in it.
False until the tree says otherwise, so a host that cannot is never mistaken for one that can.
ReadonlyhasReadonlyhasReadonlyisReadonlyisReadonlyisReadonlyisReadonlynoReadonlypathReadonlyselectReadonlytreeTrue if any entity action is registered for this entity type
Public accessor for the tree context. Kept public for backward compatibility.
The tree context
Protected_Protected_Protected_Protected_Protected_Hook called when the tree context is received or changes. Subclasses can override to add additional observations.
The tree context
The addEventListener() method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target.
Optionaloptions: boolean | AddEventListenerOptionsCallback method called with the resolved context instance or undefined.
Reference to the created Context Consumer Controller instance
Subscribe to a context. The callback fires when the context resolves, again if the context is replaced, and can also be invoked with undefined if the context is unprovided or the host disconnects. Use this whenever a controller or element needs the context at setup time — both for ongoing observation and for reading values immediately on resolve. This is the default choice; prefer it over getContext unless the context is only needed inside a later user action.
The dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order. The normal event processing rules (including the capturing and optional bubbling phase) also apply to events dispatched manually with dispatchEvent().
Optionaloptions: UmbClassGetContextOptions
Options for resolving the context once, including timeout-related behavior such as preventTimeout.
A Promise resolving to the Context API instance when available, or undefined when applicable.
Retrieve a context once as a Promise. Use this only when the context is first needed inside a user action or event handler that runs later (for example a button click, a property action, or an entity action execute()). For setup-time access — including a single immediate read — use consumeContext instead so the controller lifecycle handles resolution and cleanup. The returned Promise may reject if the context is not found before the default timeout; callers should handle rejection and/or pass preventTimeout in the options when waiting longer is expected.
An Observable to observe from.
Optionalcallback: ObserverCallback<UmbObserverValueType<ObservableType>>
Callback method called when data is changed.
OptionalcontrollerAlias: UmbControllerAlias | null
Define an explicit controller alias. If not defined then one will be generated based on the callback function. If null is parsed no controller alias will be given.
Reference to the created Observer Controller instance.
The API instance to be exposed.
Reference to the created Context Provider Controller instance
The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener() from the target. The event listener to be removed is identified using a combination of the event type, the event listener function itself, and various optional options that may affect the matching process; see Matching event listeners for removal.
Optionaloptions: boolean | EventListenerOptions
Abstract base for tree item apis. Handles item data, selection, active state, path, and entity actions — without children, expansion, or pagination.
Provides itself as
UMB_TREE_ITEM_BASE_CONTEXTso entity action conditions can discover a tree item regardless of which tree view is active.