A DOMApplication object is used to store resources—such as, HTML, JavaScript, CSS, and images—locally. This allows your web application to continue running offline when there is no network connection. The cache persists after Safari exits, so it can be used by multiple browser sessions. There is one application cache per browsing context.
SDKs
Framework
interface DOMApplicationCache
statusThe current status of the application cache. One of the values described in "Constants.”
oncheckingSent when the cache update process begins.
onerrorSent when an error occurs.
onnoupdateSent when the update process finishes but the manifest file does not change.
ondownloadingSent when the update process begins downloading resources in the manifest file.
onprogressSent when each resource in the manifest file begins to download.
onupdatereadySent when there is an existing application cache, the update process finishes, and there is a new application cache ready for use.
oncachedSent when the update process finishes for the first time—that is, the first time an application cache is saved.
Constants that indicate the status of the application cache.
UNCACHEDThe object isn’t associated with an application cache. This can occur if the update process fails and there is no previous cache to revert to, or if there is no manifest file.
IDLEThe cache is idle.
CHECKINGThe update has started but the resources are not downloaded yet—for example, this can happen when the manifest file is fetched.
DOWNLOADINGThe resources are being downloaded into the cache.
UPDATEREADYResources have finished downloading and the new cache is ready to be used.