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AppDomain element

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Specifies an additional domain that Office should trust, in addition to the one specified in the SourceLocation element. Specifying a domain has these effects:

  • It enables pages, routes, or other resources in the domain to be opened directly in the root task pane of the add-in on desktop Office platforms. (Specifying a domain in an <AppDomain> isn't necessary for Office on the web or to open a resource in an IFrame, nor it is necessary for opening a resource in a dialog opened with the Dialog API.)
  • It enables pages in the domain to make Office.js API calls from IFrames within the add-in.

Add-in type: Content, Task pane, Mail

Syntax

<AppDomain>string</AppDomain>

Important

  1. The value of the <AppDomain> element must include the protocol (for example, <AppDomain>https://myappdomain.com</AppDomain>), and the protocol must be either http or https.
  2. If there is an explicit port for the domain, include it (for example,<AppDomain>https://myappdomain.com:9999</AppDomain>).
  3. If a subdomain needs to be trusted, include it (for example,<AppDomain>https://mysubdomain.myappdomain.com</AppDomain>). The subdomain mysubdomain.mydomain.com and mydomain.com are different domains. If both need to be trusted, then both need to be in separate <AppDomain> elements.
  4. Listing the same domain as the one specified in the SourceLocation element has no effect and may be misleading. When developing on localhost, you don't usually need to create an <AppDomain> element for it. However, if you're implementing the Dialog API in an add-in that runs on Outlook on the web or the new Outlook on Windows, you must create an <AppDomain> element for localhost.
  5. Don't include any segments of a URL past the domain. For example, don't include the full URL of a page.
  6. Do not put a closing slash, "/", on the value.
  7. Wildcards, such as *, aren't allowed in <AppDomain> values; however, for add-ins running only in Office on Windows, there's a way to designate additional trusted domains with wildcards. See Wildcard trusted domains.

Contained in

Remarks

For more information, see Office Add-ins with an add-in only manifest.