then method

Promise.then method

[This documentation is preliminary and is subject to change.]

Applies to: Metro style apps only

Allows you to specify the work to be done on the fulfillment of the promised value, the error handling to be performed if the promise fails to fulfill a value, and the handling of progress notifications along the way.

Syntax


promise.then(onComplete, onError, onProgress).done( /* Your success and error handlers */ );

Parameters

onComplete

Type: Function

The function to be called if the promise is fulfilled successfully with a value. The value is passed as the single argument. If the value is null, the value is returned. The value returned from the function becomes the fulfilled value of the promise returned by then. If an exception is thrown while this function is being executed, the promise returned by then moves into the error state.

onError

Type: Function

The function to be called if the promise is fulfilled with an error. The error is passed as the single argument. If it is null, the error is forwarded. The value returned from the function becomes the fulfilled value of the promise returned by then.

onProgress

Type: Function

The function to be called if the promise reports progress. Data about the progress is passed as the single argument. Promises are not required to support progress.

Return value

Type: Object

The promise whose value is the result of executing the complete or error function.

Requirements

Minimum supported client

Windows 8 Consumer Preview

Minimum supported server

Windows Server 8 Beta

Namespace

WinJS

Library

Base.js

See also

Promise

 

 

Build date: 2/10/2012

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