Datos específicos de la aplicación para esta solicitud. Permite que el remitente y el receptor extiendan con facilidad el protocolo multimedia sin tener que usar un espacio de nombres nuevo con mensajes personalizados.
Un número para sincronizar todos los comandos de la cola.
Si se proporciona para un comando de cola, el SDK verificará que el número de secuencia
más reciente de la cola coincida con la solicitud.
secuenciaNumber actual se proporciona como parte de los mensajes salientes de cambios
en la cola.
[null,null,["Última actualización: 2025-07-25 (UTC)"],[[["\u003cp\u003e\u003ccode\u003eFetchItemsRequestData\u003c/code\u003e is used to request media items around a reference item within a media session.\u003c/p\u003e\n"],["\u003cp\u003eIt allows specifying the number of items to fetch before (\u003ccode\u003eprevCount\u003c/code\u003e) and after (\u003ccode\u003enextCount\u003c/code\u003e) a reference item (\u003ccode\u003eitemId\u003c/code\u003e).\u003c/p\u003e\n"],["\u003cp\u003eThe request includes standard properties like \u003ccode\u003erequestId\u003c/code\u003e, and optional ones like \u003ccode\u003ecustomData\u003c/code\u003e and \u003ccode\u003emediaSessionId\u003c/code\u003e for context.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eFetchItemsRequestData\u003c/code\u003e inherits properties from \u003ccode\u003ecast.framework.messages.RequestData\u003c/code\u003e, providing additional functionalities like request sequencing.\u003c/p\u003e\n"]]],[],null,["# Class: FetchItemsRequestData\n\ncast.[framework](/cast/docs/reference/web_receiver/cast.framework).[messages](/cast/docs/reference/web_receiver/cast.framework.messages).FetchItemsRequestData\n==============================================================================================================================================================\n\nclass static\n\nFetch items request data.\n\nConstructor\n-----------\n\n### FetchItemsRequestData\n\nnew\nFetchItemsRequestData(itemId, nextCount, prevCount)\n\n| #### Parameter ||\n|-----------|--------|\n| itemId | number |\n| nextCount | number |\n| prevCount | number |\n\nExtends\n: [cast.framework.messages.RequestData](/cast/docs/reference/web_receiver/cast.framework.messages.RequestData)\n\nProperties\n----------\n\n### customData\n\n(non-null Object or undefined)\n\nApplication-specific data for this request. It enables the sender and\nreceiver to easily extend the media protocol without having to use a new\nnamespace with custom messages.\n\nInherited from\n: [cast.framework.messages.RequestData#customData](/cast/docs/reference/web_receiver/cast.framework.messages.RequestData#customData)\n\n### itemId\n\nnumber\n\nID of the reference media item for fetching more items.\n\n### mediaSessionId\n\n(number or undefined)\n\nId of the media session that the request applies to.\n\nInherited from\n: [cast.framework.messages.RequestData#mediaSessionId](/cast/docs/reference/web_receiver/cast.framework.messages.RequestData#mediaSessionId)\n\n### nextCount\n\nnumber\n\nNumber of items after the reference item to be fetched.\n\n### prevCount\n\nnumber\n\nNumber of items before the reference item to be fetched.\n\n### requestId\n\nnumber\n\nId of the request, used to correlate request/response.\n\nInherited from\n: [cast.framework.messages.RequestData#requestId](/cast/docs/reference/web_receiver/cast.framework.messages.RequestData#requestId)\n\n### sequenceNumber\n\n(number or undefined)\n\nA number to synchronize all queue commands.\nIf provided for a queue command, the SDK will verify the queue latest\nsequence number match the request.\nCurrent sequenceNumber is provided as part of outgoing queue changed\nmessages.\n\nInherited from\n: [cast.framework.messages.RequestData#sequenceNumber](/cast/docs/reference/web_receiver/cast.framework.messages.RequestData#sequenceNumber)"]]
