org.symbian.tools.wrttools.doc.WebDeveloper/html/GUID-A022ED1B-E618-4C44-A437-78393900599C.html
author Eugene Ostroukhov <eugeneo@symbian.org>
Thu, 15 Jul 2010 10:08:51 -0700
changeset 450 ed815e0eef9a
parent 229 716254ccbcc0
permissions -rw-r--r--
Bug 3268 - Debugger does not start on Windows XP
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<!DOCTYPE html
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  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><meta name="copyright" content="(C) Copyright 2009"/><meta name="DC.rights.owner" content="(C) Copyright 2009"/><meta name="DC.Type" content="mobileconcept"/><meta name="DC.Title" content="onSelect"/><meta name="DC.Relation" scheme="URI" content="GUID-BE6DC1F8-A847-49B5-A3BF-318D0D1E9D8A"/><meta name="DC.Relation" scheme="URI" content="GUID-7C69DDA4-16F1-4A8F-BDB2-4CB0015B4E81"/><meta name="DC.Relation" scheme="URI" content="GUID-111DE423-9C84-4E4B-A45E-15081FE2A30D"/><meta name="DC.Format" content="XHTML"/><meta name="DC.Identifier" content="GUID-A022ED1B-E618-4C44-A437-78393900599C"/><title>onSelect </title><script type="text/javascript">
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      function initPage() {}
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    </script><link href="../PRODUCT_PLUGIN/book.css" rel="stylesheet" type="text/css"/><link href="css/s60/style.css" rel="stylesheet" type="text/css" media="all"/></head><body onload="initPage();"><div class="body"><div class="contentLeft prTxt"><h1 class="pageHeading" id="GUID-A022ED1B-E618-4C44-A437-78393900599C">onSelect</h1><div>
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<p><strong>Description:</strong></p>
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<p>The <code>onSelect</code> property of the <a href="GUID-111DE423-9C84-4E4B-A45E-15081FE2A30D.html#GUID-111DE423-9C84-4E4B-A45E-15081FE2A30D"><code>MenuItem</code></a> object is an event handler for the event of when the menu item is selected.
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In other words, when the end user opens the options menu and selects a menu
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item either from the top-level menu list or from a submenu list, the system
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will fire an event and a widget can catch the event by providing a callback
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function.</p>
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<p>The callback function is passed with an argument, which is an integer
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identifier identifying the menu item that was just selected. </p>
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<p>It is possible to assign an individual callback function for each menu
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item so that the <code>id</code> argument can be ignored.</p>
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<p><strong>Syntax:</strong></p>
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<pre class="codeblock" id="GUID-0A790E5F-77BF-437D-A0BF-2D859FB63D32">MenuItem.onSelect = function(Integer id) { }</pre>
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<p>or</p>
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<pre class="codeblock" id="GUID-34A713EA-E992-4944-8A88-08FD4F1DE666">MenuItem.onSelect = onMenuItemSelected;</pre>
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<pre class="codeblock" id="GUID-2A4AEE42-F882-4CE9-9EA1-8261F56BA332">function onMenuItemSelected(id)
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{
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  // ...
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}</pre>
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<p><strong>Remarks:</strong></p>
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<p>Submenu item's callback function must be assigned to the <code>onSelect</code> property
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after the parent menu item is appended to the main menu pane.</p>
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<p>For more general information on constructing an options menu, see <a href="GUID-94946735-D23B-49C6-BB65-8BE31737AE42.html#GUID-94946735-D23B-49C6-BB65-8BE31737AE42">Using softkeys</a>.</p>
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<p><strong>Example code:</strong></p>
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<p><em>Creating a menu:</em></p>
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<pre class="codeblock" id="GUID-EAF0A325-47DD-4AA7-81FA-D26EE10DECB6">window.onload = createMenu();</pre>
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<pre class="codeblock" id="GUID-82C1CA79-4F88-4547-8A43-5960CDF26296">// function to create a menu
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function createMenu()
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{
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  // Create a Menu Object
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  var optionsMenu = window.menu;
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  // Set a callback function for Menu
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  optionsMenu.onShow = function()
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  { 
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     alert('Event Trigger: optionsMenu.onShow');
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  }
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  // Create two Menu items
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  var m1 = new MenuItem('Beverages', 2001);
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  var m2 = new MenuItem('Snacks', 2002);
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  // Assign a callback function for the menu items
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  m1.onSelect = menuEventHandler;
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  m2.onSelect = menuEventHandler;
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  // Append two Menu items to Menu
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  optionsMenu.append(m1);
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  optionsMenu.append(m2);
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  // Create two more Menu items for Sub-Menu
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  var m11 = new MenuItem('Coca Cola', 3001);
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  var m12 = new MenuItem('Pepsi', 3002);
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  // Append two Sub Menu Items to Menu 'Beverages'
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  // get Menu Item reference by ID
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  optionsMenu.getMenuItemById(2001).append(m11);
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  // get Menu Item reference by Name
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  optionsMenu.getMenuItemByName('Beverages').append(m12);
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  // Assign a callback function for the submenu items
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  m11.onSelect = submenuEventHandler;
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  m12.onSelect = submenuEventHandler;
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}</pre>
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<p><em>Implement menu event handler:</em></p>
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<pre class="codeblock" id="GUID-646EDADD-F105-4946-A09D-8E087BD1E033">function menuEventHandler(id)
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{
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  switch (id)
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  {
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case 2001:
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break;
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case 2002:
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// do something
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break;
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  }
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}
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</pre>
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</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html>