Document: hasStorageAccess() method

{{APIRef("Storage Access API")}}

The hasStorageAccess() method of the {{domxref("Document")}} interface returns a {{jsxref("Promise")}} that resolves with a boolean value indicating whether the document has access to third-party, unpartitioned cookies.

This method is part of the Storage Access API.

[!NOTE] This method is another name for {{DOMxRef("Document.hasUnpartitionedCookieAccess()")}}. There are no current plans to remove this method in favor of {{DOMxRef("Document.hasUnpartitionedCookieAccess()")}}.

Syntax

hasStorageAccess()

Parameters

None.

Return value

A {{jsxref("Promise")}} that resolves with a boolean value indicating whether the document has access to third-party cookies — true if it does, and false if not.

The result returned by this method can be inaccurate in a couple of circumstances:

1. The user may have active browser settings that block third-party cookies; in this case, true may be returned even though third-party cookies are still inaccessible. To handle such a situation, you should gracefully handle any errors resulting in cookie values being unretrievable; for example, inform the user that access to their personalized settings is blocked and invite them to sign in again to use them.
2. The browser might not block third-party cookie access by default; in this case, false may be returned even though third-party cookies are accessible, and storage access wouldn't need to be requested (i.e., via {{domxref("Document.requestStorageAccess()")}}). To get around this issue, you could query {{domxref("Document.cookie")}} to find out whether your cookies are accessible, and call {{domxref("Document.requestStorageAccess()")}} if they are not.

[!NOTE] If the promise gets resolved and a user gesture event was being processed when the function was originally called, the resolve handler will run as if a user gesture was being processed, so it will be able to call APIs that require user activation.

Exceptions

• InvalidStateError {{domxref("DOMException")}}
  • : Thrown if the current {{domxref("Document")}} is not yet active.

Examples

document.hasStorageAccess().then((hasAccess) => {
  if (hasAccess) {
    // storage access has been granted already.
    console.log("cookie access granted");
  } else {
    // storage access hasn't been granted already;
    // you may want to call requestStorageAccess().
    console.log("cookie access denied");
  }
});

[!NOTE] See Using the Storage Access API for a more complete example.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{domxref("Document.hasUnpartitionedCookieAccess()")}}, {{domxref("Document.requestStorageAccess()")}}, {{domxref("Document.requestStorageAccessFor()")}}
• Using the Storage Access API
• Introducing Storage Access API (WebKit blog)