Interface IDBRequest<T>

The request object does not initially contain any information about the result of the operation, but once information becomes available, an event is fired on the request, and the information becomes available through the properties of the IDBRequest instance.

interface IDBRequest<T> {
    error: null | DOMException;
    onerror: null | ((this, ev) => any);
    onsuccess: null | ((this, ev) => any);
    readyState: IDBRequestReadyState;
    result: T;
    source: IDBObjectStore | IDBIndex | IDBCursor;
    transaction: null | IDBTransaction;
    addEventListener<K>(type, listener, options?): void;
    addEventListener(type, listener, options?): void;
    dispatchEvent(event): boolean;
    removeEventListener<K>(type, listener, options?): void;
    removeEventListener(type, listener, options?): void;
}

Type Parameters

  • T = any

Hierarchy (view full)

Properties

error onerror onsuccess readyState result source transaction

Methods

addEventListener dispatchEvent removeEventListener

Properties

Readonly error

error: null | DOMException

When a request is completed, returns the error (a DOMException), or null if the request succeeded. Throws a "InvalidStateError" DOMException if the request is still pending.

onerror

onerror: null | ((this, ev) => any)

Type declaration

onsuccess

onsuccess: null | ((this, ev) => any)

Type declaration

Readonly readyState

readyState: IDBRequestReadyState

Returns "pending" until a request is complete, then returns "done".

Readonly result

result: T

When a request is completed, returns the result, or undefined if the request failed. Throws a "InvalidStateError" DOMException if the request is still pending.

Readonly source

source: IDBObjectStore | IDBIndex | IDBCursor

Returns the IDBObjectStore, IDBIndex, or IDBCursor the request was made against, or null if is was an open request.

Readonly transaction

transaction: null | IDBTransaction

Returns the IDBTransaction the request was made within. If this as an open request, then it returns an upgrade transaction while it is running, or null otherwise.

Methods

addEventListener

  • addEventListener<K>(type, listener, options?): void

  • Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.

    The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.

    When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.

    When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.

    When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.

    If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.

    The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.

    Type Parameters

    Parameters

    Returns void

  • addEventListener(type, listener, options?): void

  • Parameters

    Returns void

dispatchEvent

  • dispatchEvent(event): boolean

  • Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.

    Parameters

    Returns boolean

removeEventListener

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