Menu.onbeforeshow event

Artículo
01/26/2017

Occurs immediately before a hidden Menu is displayed.

Learn about events with Quickstart: adding HTML controls and handling events.

Syntax

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

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

menu.onbeforeshow = handler;

Event information

Synchronous	No
Bubbles	Yes
Cancelable	Yes

Event handler parameters

eventInfo
Type: Event**

An object that contains information about the event.

Remarks

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 1.0
Namespace	WinJS.UI

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