Web/API/PresentationRequest/getAvailability

When the getAvailability() method is called, the user agent MUST run the following steps:

Input

presentationUrls, a list of presentation request URLs

Output

P, a Promise

1. If one of the following conditions is true:
   • The result of running the prohibits mixed security contexts algorithm on the document's settings object is "Prohibits Mixed Security Contexts" and presentationUrl is an a priori unauthenticated URL.
   • The document object's active sandboxing flag set has the sandboxed presentation browsing context flag set.

   Run the following substeps:

   1. Return a Promise rejected with a SecurityError.
   2. Abort these steps.
2. Let P be a new Promise.
3. Return P, but continue running these steps in parallel.
4. If the user agent is unable to monitor the list of available presentation displays for the entire duration of the controlling browsing context (e.g., because the user has disabled this feature), then:
   1. Resolve P with a new PresentationAvailability object with its value property set to false.
   2. Abort all the remaining steps.
5. If the user agent is unable to continuously monitor the list of available presentation displays but can find presentation displays in order to start a connection, then:
   1. Reject P with a NotSupportedError exception.
   2. Abort all the remaining steps.
6. If there exists a tuple (A, presentationUrls) in the set of availability objects, then:
   1. Resolve P with A.
   2. Abort all the remaining steps.
7. Let A be a new PresentationAvailability object with its value property set as follows:
   1. false if the list of available presentation displays is empty.
   2. true if there is at least one compatible presentation display for some member of presentationUrls. Meaning there is an entry (presentationUrl, display) in the list of available presentation displays for some presentationUrl in presentationUrls.
   3. false otherwise.
8. Create a tuple (A, presentationUrls) and add it to the set of availability objects.
9. Run the algorithm to monitor the list of available presentation displays.
10. Resolve P with A.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
getAvailability Experimental'	Chrome Full support 48	Edge Full support ≤79	Firefox Full support 51 Disabled' Full support 51 Disabled' Disabled' From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 35	Safari ?	WebView Android No support No	Chrome Android Full support 48	Firefox Android Full support 51 Disabled' Full support 51 Disabled' Disabled' From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.	Opera Android Full support 35	Safari iOS ?	Samsung Internet Android Full support 5.0

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

User must explicitly enable this feature.'

User must explicitly enable this feature.

getAvailability by Mozilla Contributors is licensed under CC-BY-SA 2.5.