getAvailability

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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: 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. That is, 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.

Document Tags and Contributors

 Contributors to this page: MashKao
 Last updated by: MashKao,