Binding.addHandlerAsync method

Adds a handler to the binding for the specified event type.


Hosts:	Access, Excel, Word
Available in Requirement set	BindingEvents
Last changed in	1.1

bindingObj.addHandlerAsync(eventType, handler [, options], callback);

Parameters

Name	Type	Description
eventType	EventType	Specifies the type of event to add. Required.For a Binding object event, the eventType parameter can be specified as Office.EventType.BindingSelectionChanged, Office.EventType.BindingDataChanged, or the corresponding text values of these enumerations.
handler	object	The event handler function to add.
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 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.

Remarks

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

Example

The following code sample calls the select method of the Office object to access the binding with ID "MyBinding", and then calls the addHandlerAsync method to add a handler function for the bindingDataChanged event of that binding.

function addEventHandlerToBinding() {
    Office.select("bindings#MyBinding").addHandlerAsync(Office.EventType.BindingDataChanged, onBindingDataChanged);
}

function onBindingDataChanged(eventArgs) {
    write("Data has changed in binding: " + eventArgs.binding.id);
}

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

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.

Supported hosts, by platform

	Office for Windows desktop	Office Online (in browser)	Office for iPad
Access		Y
Excel	Y	Y	Y
Word	Y	Y	Y


Available in requirement sets	BindingEvents
Minimum permission level	ReadWriteDocument
Add-in types	Content, task pane
Library	Office.js
Namespace	Office

Support history

Version	Changes
1.1	Added support for Word Online.
1.1	Added support for Excel and Word in Office for iPad.
1.1	Added support for add-ins for Access.
1.0	Introduced

Docs