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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>YUI Library Examples: Menu Family: Adding A Context Menu To A Table</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<style>
/*Supplemental CSS for the YUI distribution*/
#custom-doc { width: 95%; min-width: 950px; }
#pagetitle {background-image: url(../../assets/bg_hd.gif);}
</style>
<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
<!--Script and CSS includes for YUI dependencies on this page-->
<link rel="stylesheet" type="text/css" href="../../build/menu/assets/skins/sam/menu.css" />
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<script type="text/javascript" src="../../build/menu/menu-min.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/button/button-min.js"></script>
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<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
</script>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="pagetitle"><h1>YUI Library Examples: Menu Family: Adding A Context Menu To A Table</h1></div>
</div>
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<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>Menu Family: Adding A Context Menu To A Table</h1>
<div class="exampleIntro">
<p>
This example creates context menu for an HTML table and illustrates how the
content of a ContextMenu instance can be replaced on the fly based on the
element that triggered its display.
</p>
<p>
<em>Please Note:</em> Opera users will need to do the following to use
this example:
</p>
<ul id="operainstructions">
<li>
<em>Opera for Windows:</em> Hold down the control key and click with
the left mouse button.
</li>
<li>
<em>Opera for OS X:</em> Hold down the command key (&#8984;) and click
with the left mouse button.
</li>
</ul>
</div>
<div class="example-container module newWindow">
<div id="example-canvas" class="bd">
<p class="newWindowButton yui-skin-sam"><span id="newWindowLink"><span class="first-child"><a href="tablecontextmenu_source.html" target="_blank">View example in new window.</a></span></span>
</div>
</div>
</div>
<p>
When adding context menus to large data structures like a
<code>&#60;table&#62;</code> or large list (<code>&#60;ol&#62;</code>
or <code>&#60;ul&#62;</code>), it is recommended to bind a single
YAHOO.widget.ContextMenu instance to the structure's root element, than to each of its
child nodes (<code>&#60;tr&#62;</code>s or <code>&#60;li&#62;</code>s).
Doing so significantly improves the performance of a web page or
application by reducing the number of "contextmenu" event handlers
as well as the number of YAHOO.widget.ContextMenu instances in memory.
</p>
<p>
Begin by creating an <code>&#60;table&#62;</code> and giving
<code>&#60;tr&#62;</code> elements that should have the same context menu a
similar class name.
</p>
<p>
Next, use the <a href="../../event/#onavailable"><code>onContentReady</code>
method of the Event</a> utility to listen for when the <code>&#60;table&#62;</code>
element is are ready to be scripted.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
YAHOO.util.Event.onContentReady("dataset", function () {
});
</textarea>
<p>
Inside the function passed to the Event Utility's <code>onContentReady</code> method, create a
shortcut to the Dom Utility (since it will be used frequently) and an object literal that maps each
class name to a set of MenuItem configuration properties.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
YAHOO.util.Event.onContentReady("dataset", function () {
var Dom = YAHOO.util.Dom;
/*
Map of CSS class names to arrays of MenuItem
configuration properties.
*/
var oContextMenuItems = {
"type1": [
"Context Menu 1, Item 1",
{
text: "Context Menu 1, Item 2",
submenu: {
id: "submenu1",
lazyload: true,
itemdata: [
"Context Menu 1 Submenu, Item 1",
"Context Menu 1 Submenu, Item 2",
"Context Menu 1 Submenu, Item 3",
"Context Menu 1 Submenu, Item 4"
]
}
},
"Context Menu 1, Item 3",
"Context Menu 1, Item 4"
],
"type2": [
"Context Menu 2, Item 1",
"Context Menu 2, Item 2",
"Context Menu 2, Item 3",
"Context Menu 2, Item 4",
"Context Menu 2, Item 5",
"Context Menu 2, Item 6",
"Context Menu 2, Item 7",
"Context Menu 2, Item 8",
"Context Menu 2, Item 9",
"Context Menu 2, Item 10"
],
"type3": [
"Context Menu 3, Item 1",
"Context Menu 3, Item 2",
"Context Menu 3, Item 3",
"Context Menu 3, Item 4"
],
"type4": [
"Context Menu 4, Item 1",
"Context Menu 4, Item 2"
],
"type5": [
"Context Menu 5, Item 1",
"Context Menu 5, Item 2",
"Context Menu 5, Item 3",
"Context Menu 5, Item 4",
"Context Menu 5, Item 5",
"Context Menu 5, Item 6"
]
};
});
</textarea>
<p>
Lastly, add a "beforeShow" event handler to the ContextMenu instance.
This event handler makes use of the "contextEventTarget" property to determine
which <code>&#60;tr&#62;</code> element was the target of the "contextmenu"
event. Once found, the <code>&#60;tr&#62;</code> element's class name is
used to look up its corresponding menu items in the "oContextMenuItems"
map, which are then added to the ContextMenu instance via the "addItems" method.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
YAHOO.util.Event.onContentReady("dataset", function () {
var Dom = YAHOO.util.Dom;
/*
Map of CSS class names to arrays of MenuItem
configuration properties.
*/
var oContextMenuItems = {
"type1": [
"Context Menu 1, Item 1",
{
text: "Context Menu 1, Item 2",
submenu: {
id: "submenu1",
lazyload: true,
itemdata: [
"Context Menu 1 Submenu, Item 1",
"Context Menu 1 Submenu, Item 2",
"Context Menu 1 Submenu, Item 3",
"Context Menu 1 Submenu, Item 4"
]
}
},
"Context Menu 1, Item 3",
"Context Menu 1, Item 4"
],
"type2": [
"Context Menu 2, Item 1",
"Context Menu 2, Item 2",
"Context Menu 2, Item 3",
"Context Menu 2, Item 4",
"Context Menu 2, Item 5",
"Context Menu 2, Item 6",
"Context Menu 2, Item 7",
"Context Menu 2, Item 8",
"Context Menu 2, Item 9",
"Context Menu 2, Item 10"
],
"type3": [
"Context Menu 3, Item 1",
"Context Menu 3, Item 2",
"Context Menu 3, Item 3",
"Context Menu 3, Item 4"
],
"type4": [
"Context Menu 4, Item 1",
"Context Menu 4, Item 2"
],
"type5": [
"Context Menu 5, Item 1",
"Context Menu 5, Item 2",
"Context Menu 5, Item 3",
"Context Menu 5, Item 4",
"Context Menu 5, Item 5",
"Context Menu 5, Item 6"
]
};
var oSelectedTR; // The currently selected TR
/*
"beforeshow" event handler for the ContextMenu instance -
replaces the content of the ContextMenu instance based
on the CSS class name of the <tr> element that triggered
its display.
*/
function onContextMenuBeforeShow(p_sType, p_aArgs) {
var oTarget = this.contextEventTarget,
aMenuItems,
aClasses;
if (this.getRoot() == this) {
/*
Get the <tr> that was the target of the
"contextmenu" event.
*/
oSelectedTR = oTarget.nodeName.toUpperCase() == "TR" ?
oTarget : Dom.getAncestorByTagName(oTarget, "TR");
/*
Get the array of MenuItems for the CSS class name from
the "oContextMenuItems" map.
*/
if (Dom.hasClass(oSelectedTR, "odd")) {
aClasses = oSelectedTR.className.split(" ");
aMenuItems = oContextMenuItems[aClasses[0]];
}
else {
aMenuItems = oContextMenuItems[YAHOO.lang.trim(oSelectedTR.className)];
}
// Remove the existing content from the ContentMenu instance
this.clearContent();
// Add the new set of items to the ContentMenu instance
this.addItems(aMenuItems);
// Render the ContextMenu instance with the new content
this.render();
/*
Highlight the <tr> element in the table that was
the target of the "contextmenu" event.
*/
Dom.addClass(oSelectedTR, "selected");
}
}
/*
"hide" event handler for the ContextMenu - used to
clear the selected <tr> element in the table.
*/
function onContextMenuHide(p_sType, p_aArgs) {
if (this.getRoot() == this && oSelectedTR) {
Dom.removeClass(oSelectedTR, "selected");
}
}
/*
Instantiate a ContextMenu: The first argument passed to
the constructor is the id of the element to be created; the
second is an object literal of configuration properties.
*/
var oContextMenu = new YAHOO.widget.ContextMenu("contextmenu", {
trigger: "dataset",
lazyload: true
});
/*
Subscribe to the ContextMenu instance's "beforeshow" and
"hide" events.
*/
oContextMenu.subscribe("beforeShow", onContextMenuBeforeShow);
oContextMenu.subscribe("hide", onContextMenuHide);
});
</textarea>
<h2>Configuration for This Example</h2>
<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?menu&reset&fonts&grids&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
</div>
<div class="yui-u">
<div id="examples">
<h3 class='firstContent'>Menu Family Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../menu/example01.html'>Basic Menu From Markup</a></li><li><a href='../menu/example02.html'>Basic Menu From JavaScript</a></li><li><a href='../menu/example03.html'>Grouped Menu Items Using Markup</a></li><li><a href='../menu/example04.html'>Grouped Menu Items Using JavaScript</a></li><li><a href='../menu/example05.html'>Grouped Menu Items With Titles From Markup</a></li><li><a href='../menu/example06.html'>Grouped Menu Items With Titles From JavaScript</a></li><li><a href='../menu/example07.html'>Multi-tiered Menu From Markup</a></li><li><a href='../menu/example08.html'>Multi-tiered Menu From JavaScript</a></li><li><a href='../menu/example09.html'>Handling Menu Click Events</a></li><li><a href='../menu/example10.html'>Listening For Menu Events</a></li><li><a href='../menu/example11.html'>MenuItem Configuration Properties</a></li><li><a href='../menu/example12.html'>Setting Menu Configuration Properties At Runtime</a></li><li><a href='../menu/leftnavfrommarkup.html'>Website Left Nav With Submenus Built From Markup</a></li><li><a href='../menu/leftnavfromjs.html'>Website Left Nav With Submenus From JavaScript</a></li><li><a href='../menu/topnavfrommarkup.html'>Website Top Nav With Submenus Built From Markup</a></li><li><a href='../menu/topnavfromjs.html'>Website Top Nav With Submenus From JavaScript</a></li><li><a href='../menu/leftnavfrommarkupwithanim.html'>Website Left Nav Using Animation With Submenus Built From Markup</a></li><li><a href='../menu/leftnavfromjswithanim.html'>Website Left Nav Using Animation With Submenus From JavaScript</a></li><li><a href='../menu/topnavfrommarkupwithanim.html'>Website Top Nav Using Animation With Submenus Built From Markup</a></li><li><a href='../menu/topnavfromjswithanim.html'>Website Top Nav Using Animation With Submenus From JavaScript</a></li><li><a href='../menu/contextmenu.html'>Context Menu</a></li><li class='selected'><a href='../menu/tablecontextmenu.html'>Adding A Context Menu To A Table</a></li><li><a href='../menu/treeviewcontextmenu.html'>Adding A Context Menu To A TreeView</a></li><li><a href='../menu/programsmenu.html'>OS-Style Programs Menu</a></li><li><a href='../menu/applicationmenubar.html'>Application Menubar</a></li><li><a href='../menu/menuwaiaria.html'>Using the Menu ARIA Plugin</a></li><li><a href='../button/button-menu-swap.html'>Replacing the content of a Button's Menu (included with examples for Button Control)</a></li><li><a href='../button/button-menu-select.html'>Using A Menu Button To Replace A &#60;select&#62; Element (included with examples for Button Control)</a></li><li><a href='../button/button-ariaplugin.html'>Using the Button ARIA Plugin (included with examples for Button Control)</a></li><li><a href='../datatable/dt_contextmenu.html'>Context Menu Integration (included with examples for DataTable Control)</a></li><li><a href='../button/btn_example07.html'>Menu Buttons (included with examples for Button Control)</a></li><li><a href='../button/btn_example08.html'>Split Buttons (included with examples for Button Control)</a></li><li><a href='../button/btn_example11.html'>Color Picker Button (included with examples for Button Control)</a></li><li><a href='../button/btn_example12.html'>Fixed Width Menu Button (included with examples for Button Control)</a></li><li><a href='../button/btn_example14.html'>Slider Button (included with examples for Button Control)</a></li><li><a href='../layout/menu_layout.html'>Layout with Menu Controls (included with examples for Layout Manager)</a></li><li><a href='../profilerviewer/pv-api.html'>Using the ProfilerViewer API while Profiling the YUI Menu Control (included with examples for ProfilerViewer Control)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More Menu Family Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/menu/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_menu.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/menu.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
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