Windows apps
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NavBar.onbeforeshow event

Applies to Windows only

[onbeforeshow is no longer available for use as of OSVersion. Instead, use onbeforeopen. ]

onbeforeshow is no longer available. Instead, use onbeforeopen. Occurs immediately before a hidden NavBar is displayed.

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

Syntax


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


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

navBar.onbeforeshow = handler;


Event information

SynchronousNo
BubblesYes
CancelableYes

 

Event handler parameters

eventInfo

Type: Event

An object that contains information about the event.

Requirements

Minimum supported client

Windows 8.1 [Windows Store apps only]

Minimum supported server

Windows Server 2012 R2 [Windows Store apps only]

Minimum supported phone

None supported

End of client support

Windows 8.1

End of phone support

None supported

End of server support

Windows Server 2012 R2

Namespace

WinJS.UI

Library

Ui.js

See also

NavBar
NavBarCommand
NavBarContainer
BackButton
AppBar
Your first app - Part 3: PageControl objects and navigation
Navigating between pages (HTML)
Adding app bars
Adding nav bars
HTML AppBar control sample
HTML NavBar control sample
Navigation and navigation history sample
Designers
Command patterns
Navigation patterns
Guidelines for app bars
Bottom app bar
Top app bar

 

 

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