CacheStorage: open() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The open() method of the
CacheStorage interface returns a Promise that resolves to
the Cache object matching the cacheName.
You can access CacheStorage through the Window.caches property in windows or through the WorkerGlobalScope.caches property in workers.
Syntax
open(cacheName)
Parameters
cacheName-
The name of the cache you want to open.
Return value
Examples
This example is from the MDN simple service worker example (see simple service worker running live).
Here we wait for an InstallEvent to fire, then runs
waitUntil() to handle the install process for
the app. This consists of calling CacheStorage.open() to create a new
cache, then using Cache.addAll() to add a series of assets to it.
self.addEventListener("install", (event) => {
event.waitUntil(
caches
.open("v1")
.then((cache) =>
cache.addAll([
"/",
"/index.html",
"/style.css",
"/app.js",
"/image-list.js",
"/star-wars-logo.jpg",
"/gallery/bountyHunters.jpg",
"/gallery/myLittleVader.jpg",
"/gallery/snowTroopers.jpg",
]),
),
);
});
Specifications
| Specification |
|---|
| Service Workers Nightly # cache-storage-open |
Browser compatibility
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support