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 Workers The definition of 'CacheStorage: delete' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
delete | Chrome Full support 40 | Edge Full support 16 | Firefox
Full support
44
| 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.