DOMApplicationsRegistry.checkInstalled()
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Summary
Gets information about the given app. This can be used to determine if the app is installed.
Syntax
<code>var request = window.navigator.mozApps.</code>checkInstalled<code>(url)</code>;
Parameters
Return value
The checkInstalled()
function returns a DOMRequest
object. The DOMRequest.result
property contains an App
object, which is a JavaScript object that describes the installed app. If the app is not installed, then DOMRequest.result
is null
.
Errors
The string ERROR
can be returned in DOMRequest.error
.
An NS_ERROR_DOM_BAD_URI
exception will be thrown if the manifest is in a different domain than the page requesting the information is. This will be thrown as soon as checkInstalled
is invoked.
Example
var request = window.navigator.mozApps.checkInstalled("http://example.com/manifest.webapp"); request.onerror = function(e) { alert("Error calling checkInstalled: " + request.error.name); }; request.onsuccess = function(e) { if (request.result) { console.log("App is installed!"); } else { console.log("App is not installed!"); } };
Callers are expected to set the onsuccess
and onerror
callback properties of the returned object, as shown in this example. If the call is successful an App
object is returned in the result
property of the returned object. In the example this is request.result
.
Related topics
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/domapplicationsregistry/checkinstalled