BackgroundFetchManager.md

BackgroundFetchManager

Namespace: SpawnDev.SpawnJS.JSObjects
Inherits: SpawnJSObject
Source: JSObjects/BackgroundFetchManager.cs
MDN Reference: BackgroundFetchManager on MDN

The BackgroundFetchManager interface of the Background Fetch API is a map where the keys are background fetch IDs and the values are BackgroundFetchRegistration objects. https://developer.mozilla.org/en-US/docs/Web/API/BackgroundFetchManager

Methods

Method	Return Type	Description
Fetch(string id, IEnumerable<Union<string, Request>> requests, BackgroundFetchOptions options)	Task<BackgroundFetchRegistration>	Returns a Promise that resolves with a BackgroundFetchRegistration object for a supplied array of URLs and Request objects.
Get(string id)	Task<BackgroundFetchRegistration?>	Returns a Promise that resolves with the BackgroundFetchRegistration associated with the provided id or undefined if the id is not found.
GetIds()	string[]	Returns the IDs of all registered background fetches.

Examples

SpawnDev.SpawnJS Mapping Note: The JavaScript examples below show the standard Web API usage. In SpawnDev.SpawnJS, the same API is available with C# conventions:

• Properties and methods use PascalCase (e.g., readyState becomes ReadyState)
• Events use ActionEvent with +=/-= (e.g., addEventListener("click", fn) becomes OnClick += handler)
• Async methods return Task<T> instead of Promise<T>
• Objects should be disposed with using statements
• Access via JS.Get<BackgroundFetchManager>(...) or constructor new BackgroundFetchManager(...)

navigator.serviceWorker.ready.then(async (swReg) => {
  const bgFetch = await swReg.backgroundFetch.fetch(
    "my-fetch",
    ["/ep-5.mp3", "ep-5-artwork.jpg"],
    {
      title: "Episode 5: Interesting things.",
      icons: [
        {
          sizes: "300x300",
          src: "/ep-5-icon.png",
          type: "image/png",
        },
      ],
      downloadTotal: 60 * 1024 * 1024,
    },
  );
});

See full example on MDN