ListView.onkeyboardnavigating event

Articolo
01/26/2017

Raised when the focused item changes.

Syntax

<div data-win-control="WinJS.UI.ListView" 
    data-win-options="{onkeyboardnavigating : handler}">
</div>

function handler(eventInfo) { /* Your code */ }
 
// addEventListener syntax
listView.addEventListener("keyboardnavigating", handler);
listView.removeEventListener("keyboardnavigating", handler);
 
- or -

listView.onkeyboardnavigating = handler;

Event information

Synchronous	No
Bubbles	Yes
Cancelable	Yes

Event handler parameters

eventInfo
Type: CustomEvent**

An object that contains info about the event. The detail property of this object contains the following sub-properties:

Property	Meaning
detail.oldFocus	The index of the item that previously had focus.
detail.newFocus	The index of the item that gained focus.

Remarks

ListView events execute synchronously, so avoid performing expensive operations in your event handler. Performing expensive operations in your event handler can make the ListView seem unresponsive to the user. If you need the event handler to perform an expensive operation, call setImmediate from your event handler and pass it a function that performs the operation or perform the operation as an asynchronous operation. For more info about asynchronous programming, see Asynchronous programming in JavaScript.

Setting event handlers declaratively (in HTML)

To set the event handler declaratively, it must be accessible to the global scope, and you must also call WinJS.Utilities.markSupportedForProcessing or WinJS.UI.eventHandler on the handler. You can make the handler accessible to the global scope by using WinJS.Namespace.define. For more information, see How to set event handlers declaratively.

Requirements

Minimum WinJS version	WinJS 3.0
Namespace	WinJS.UI

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