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.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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

BCD tables only load in the browser