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Document.addHandlerAsync method (JavaScript API for Office)

apps for Office

Adds an event handler for a Document object event.

Last modified: March 02, 2015

Hosts:

Excel, Project, Word

Available in Requirement set

DocumentEvents

Added in

1.0

See all support details

Office.context.document.addHandlerAsync(eventType, handler  [, options], callback);

Name

Type

Description

Support notes

eventType

EventType

For a Document object event, the eventType parameter can be specified as Office.EventType.DocumentSelectionChanged, or the corresponding text value of this enumeration.

handler

object

The event handler function to add, whose only parameter is of type DocumentSelectionChangedEventArgs. 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.

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 addHandlerAsync 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 data or object to retrieve when adding an event handler.

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.

You can add multiple event handlers for the specified eventType as long as the name of each event handler function is unique.

function addSelectionChangedEventHandler() {
    Office.context.document.addHandlerAsync(Office.EventType.DocumentSelectionChanged, MyHandler);
}

function MyHandler(eventArgs) {
    write('Event raised: ' + eventArgs.type);
    doSomethingWithDocument(eventArgs.document);
}

// Function that writes to a div with id='message' on the page.
function write(message){
    document.getElementById('message').innerText += message; 
}

A checkmark (√) 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 apps for Office.

Supported hosts, by platform

Office for Windows desktop

Office for Windows RT

Office Online
(in browser)

Excel

Project

Word

Available in requirement sets

DocumentEvents

Minimum permission level

ReadWriteDocument

App types

Content, task pane

Library

Office.js

Namespace

Office

Version

Changes

1.0

Introduced

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