Cache.addAll()

The addAll() method of the Cache interface takes an array of URLs, retrieves them, and adds the resulting response objects to the given cache. The request objects created during retrieval become keys to the stored response operations.

Note: addAll() will overwrite any key/value pairs previously stored in the cache that match the request, but will fail if a resulting put() operation would overwrite a previous cache entry stored by the same addAll() method.

Syntax

addAll(requests)

Parameters

requests

An array of string URLs that you want to be fetched and added to the cache. You can specify the Request object instead of the URL.

Return value

A Promise that resolves with undefined.

Exceptions

TypeError

The URL scheme is not http or https.

The Response status is not in the 200 range (i.e., not a successful response.) This occurs if the request does not return successfully, but also if the request is a cross-origin no-cors request (in which case the reported status is always 0.)

Examples

This code block waits 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 addAll() to add a series of assets to it. 

this.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/",
          "/gallery/bountyHunters.jpg",
          "/gallery/myLittleVader.jpg",
          "/gallery/snowTroopers.jpg",
        ])
      )
  );
});

Specifications

Specification
Service Workers
# cache-addAll

Browser compatibility

BCD tables only load in the browser

See also