CustomXmlPrefixMappings.addNamespaceAsync method

Asynchronously adds a prefix to namespace mapping to use when querying an item.

Hosts: Word
Available in Requirement set
Added in 1.1
customXmlPrefixMappingsObj.addNamespaceAsync(prefix, ns [, options], callback);


Name Type Description Support notes
prefix string Specifies the prefix to add to the prefix mapping list. Required.
ns string Specifies the namespace to assign to the newly added prefix. Required.
options object Specifies any of the following optional parameters
asyncContext array, boolean, null, number, object, string, or undefined A user-defined item of any type that is returned in the AsyncResult object without being altered.
callback object A function that is invoked when the callback returns, whose only parameter is of type AsyncResult.

Callback Value

When the function you passed to the callback parameter executes, it receives an AsyncResult object that you can access from the callback function's only parameter.

In the callback function passed to the addNamespaceAsync method, you can use the properties of the AsyncResult object to return the following information.

Property Use to...
AsyncResult.value Always returns undefined because there is no object or data to retrieve.
AsyncResult.status Determine the success or failure of the operation.
AsyncResult.error Access an Error object that provides error information if the operation failed.
AsyncResult.asyncContext Access your user-defined object or value, if you passed one as the asyncContext parameter.


If the prefix already exists in the namespace manager, this method will overwrite the mapping of that prefix except when the prefix is one added or used by the data store internally, in which case it will return an error.

Support details

A capital Y in the following matrix indicates that this method is supported in the corresponding Office host application. An empty cell indicates that the Office host application doesn't support this method.

For more information about Office host application and server requirements, see Requirements for running Office Add-ins.

Office for Windows desktop Office Online (in browser) Office for iPad
Word Y Y Y
Available in requirement sets CustomXmlParts
Minimum permission level ReadWriteDocument
Add-in types Task pane
Library Office.js
Namespace Office

Support history

Version Changes
1.1 Added support for Word in Office for iPad.
1.0 Introduced