The delete
()
method of the CacheStorage
interface finds the Cache
object matching the cacheName
, and if found, deletes the Cache
object and returns a Promise
that resolves to true
. If no Cache
object is found, it resolves to false
.
You can access CacheStorage
through the global caches
property.
Syntax
caches.delete(cacheName).then(function(boolean) { // your cache is now deleted });
Parameters
cacheName
- The name of the cache you want to delete.
Return value
a Promise
that resolves to true
if the Cache
object is found and deleted, and false
otherwise.
Examples
In this code snippet we wait for an activate event, and then run a waitUntil()
block that clears up any old, unused caches before a new service worker is activated. Here we have an array of cache names we want to keep (cachesToKeep
). We return the keys of the caches in the CacheStorage
object using CacheStorage.keys
, then check each key to see if it is in the array. If not, we delete it using delete()
.
this.addEventListener('activate', function(event) {
var cachesToKeep = ['v2'];
event.waitUntil(
caches.keys().then(function(keyList) {
return Promise.all(keyList.map(function(key) {
if (cachesToKeep.indexOf(key) === -1) {
return caches.delete(key);
}
}));
})
);
});
Specifications
Specification | Status | Comment |
Service WorkersThe definition of 'CacheStorage: delete' in that specification. | Working Draft | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 40 |
Edge
Full support 16 |
Firefox Full support 44 Full support 44 Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API. |
IE
No support No |
Opera
Full support 27 |
Safari
Full support 11.1 |
WebView Android
Full support 40 |
Chrome Android
Full support 40 |
Firefox Android
Full support 44 |
Opera Android
Full support 27 |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
- See implementation notes.'
- See implementation notes.
See also
CacheStorage.delete() by Mozilla Contributors is licensed under CC-BY-SA 2.5.