Building Progressive Web Applications/

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Working with the Cache API

Working with the Cache API

Learn how to use the Cache API and get to know the functions it provides.

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The caches interface

The Cache API provides every web application with a caches interface, which gives us access to the cache storage of our application. Multiple sub-caches can be opened inside the cache storage. Let’s see how to open a cache in it using the caches interface.

The caches.open(name: string) method

The open(name) method will open the cache (with the given name) if it already exists. Otherwise, it will create one and then open it.

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caches.open('my-cache')
  .then(function (cache) {
      // use the returned cache
  });

In the above example:

  1. Open a cache named my-cache.
  2. Return a promise handled by a .then() call using the caches.open() method.
  3. Get the cache object after resolving the returned promise, which we can use inside the then() block.

The Cache.add(request: string) method

The .add() method ...