Cache.add()
The add()
method of the Cache
interface takes a URL, retrieves it, and adds the resulting response object to the given cache.
The add()
method is functionally equivalent to the following:
fetch(url).then(function(response) {
if (!response.ok) {
throw new TypeError('bad response status');
}
return cache.put(url, response);
})
For more complex operations, you'll need to use Cache.put()
directly.
Note: add()
will overwrite any key/value pair previously stored in the cache that matches the request.
Syntax
cache.add(request).then(function() {
// request has been added to the cache
});
Parameters
- request
-
The request you want to add to the cache. This can be a
Request
object or a URL.
Return value
A Promise
that resolves with undefined
.
Exceptions
TypeError
-
The URL scheme is not
http
orhttps
.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 calls waitUntil()
to handle the install process for the app. This consists of calling CacheStorage.open
to create a new cache, then using Cache.add
to add an asset to it.
this.addEventListener('install', function(event) {
event.waitUntil(
caches.open('v1').then(function(cache) {
return cache.add('/sw-test/index.html');
})
);
});
Specifications
Specification |
---|
Service Workers 1 # cache-add |
Browser compatibility
BCD tables only load in the browser