Data khusus aplikasi untuk permintaan ini. Hal ini memungkinkan pengirim dan penerima memperluas protokol media dengan mudah tanpa harus menggunakan namespace baru dengan pesan kustom.
Nomor untuk menyinkronkan semua perintah antrean.
Jika diberikan untuk perintah antrean, SDK akan memverifikasi bahwa nomor urut antrean terbaru cocok dengan permintaan.
SequenceNumber saat ini diberikan sebagai bagian dari antrean keluar pesan
yang diubah.
[null,null,["Terakhir diperbarui pada 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)"]]
