Navigator.mozIsLocallyAvailable()

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The Navigator.mozIsLocallyAvailable() method allows add-ons to determine whether or not a given resource is available.

Note: Security exceptions can occur if the requested URI is not from the same origin.

Syntax

navigator.mozIsLocallyAvailable(uri, ifOffline);

Parameters

uri
The URI of the resource whose availability is to be checked, as a string.
ifOffline

Allows you to specify whether or not the offline resources cache should be checked; specify true to consider the offline resources cache.

Example

var available = navigator.mozIsLocallyAvailable("my-image-file.png", true);
if (available) {
  /* the offline resource is present */
} else {
  console.log("Certain needed resources are not available offline");
}

Specifications

Not part of any specifications.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
DeprecatedNon-standard
Chrome No support NoEdge No support NoFirefox No support ? — 35IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile No support NoFirefox Android No support ? — 35Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

No support  
No support
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

Document Tags and Contributors

Last updated by: teoli,