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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>YUI Library Examples: TreeView Control: Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </title>
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<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
<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/logger/assets/skins/sam/logger.css" />
<link rel="stylesheet" type="text/css" href="../../build/treeview/assets/skins/sam/treeview.css" />
<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
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<script type="text/javascript" src="../../build/treeview/treeview-debug.js"></script>
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<!--begin custom header content for this example-->
<style type="text/css">
.whitebg {
background-color:white;
}
</style>
<!--end custom header content for this example-->
<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>
</head>
<body id="yahoo-com" class="yui-skin-sam">
<div id="custom-doc" class="yui-t2">
<div id="hd">
<div id="ygunav">
<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
<form action="http://search.yahoo.com/search" id="sitesearchform">
<input name="vs" type="hidden" value="developer.yahoo.com">
<input name="vs" type="hidden" value="yuiblog.com">
<div id="sitesearch">
<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
<input type="text" id="searchinput" name="p">
<input type="submit" value="Search" id="searchsubmit" class="ygbt">
</div>
</form> </div>
<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
<div id="pagetitle"><h1>YUI Library Examples: TreeView Control: Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </h1></div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>TreeView Control: Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </h1>
<div class="exampleIntro">
<p>In this simple example you can see how to build
<a href="http://developer.yahoo.com/yui/treeview/">TreeView Control</a> from existing HTML markup
and from a previous tree definition or from a branch of it.</p>
</div>
<div class="example-container module ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="tv_markup_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<link rel="stylesheet" type="text/css" href="../../build/assets/skins/sam/calendar.css" />
<h3>Tree from markup</h3>
<div id="markup" class="whitebg">
<ul>
<li class="expanded">List 0
<ul>
<li class="expanded">List 0-0
<ul>
<li>item 0-0-0</li>
<li><a target="_new" href="www.elsewhere.com" title="go elsewhere">elsewhere</a></li>
</ul>
</li>
</ul>
</li>
<li>List 1
<ul>
<li>List 1-0
<ul>
<li yuiConfig='{"type":"DateNode","editable":true}'>02/01/2009</li>
<li><span>item <strong>1-1-0</strong></span></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<hr/>
<h3>Copy of the tree above taken from its own definition</h3>
<div id="treeDiv2" class="whitebg"></div>
<hr/>
<h3>Copy of the second branch of the tree at the top</h3>
<div id="treeDiv3" class="whitebg"></div>
<hr/>
<h3>Tree built from a static definition</h3>
<div id="treeDiv4" class="whitebg"></div>
<script type="text/javascript" src="../../build/json/json-min.js"></script>
<script type="text/javascript" src="../../build/calendar/calendar-min.js"></script>
<script type="text/javascript">
//global variable to allow console inspection of tree:
var tree1, tree2, tree3;
//anonymous function wraps the remainder of the logic:
(function() {
var treeInit = function() {
tree1 = new YAHOO.widget.TreeView("markup");
tree1.render();
tree1.subscribe('dblClickEvent',tree1.onEventEditNode);
tree2 = new YAHOO.widget.TreeView("treeDiv2",tree1.getTreeDefinition());
tree2.render();
tree2.subscribe('dblClickEvent',tree2.onEventEditNode);
var branch = tree1.getRoot().children[1];
tree3 = new YAHOO.widget.TreeView("treeDiv3", branch.getNodeDefinition());
tree3.render();
tree3.subscribe('dblClickEvent',tree3.onEventEditNode);
(new YAHOO.widget.TreeView("treeDiv4",[
'Label 0',
{type:'Text', label:'text label 1', title:'this is the tooltip for text label 1'},
{type:'Text', label:'branch 1', title:'there should be children here', expanded:true, children:[
'Label 1-0'
]},
{type:'Text',label:'YAHOO',title:'this should be an href', href:'http://www.yahoo.com', target:'somewhere new'},
{type:'HTML',html:'<a href="developer.yahoo.com/yui">YUI</a>'},
{type:'MenuNode',label:'branch 3',title:'this is a menu node', expanded:false, children:[
'Label 3-0',
'Label 3-1'
]}
])).render();
};
//Add an onDOMReady handler to build the tree when the document is ready
YAHOO.util.Event.onDOMReady(treeInit);
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">Building trees from HTML markup or from previous definitions.</h2>
<p>In this brief example for the <a href="http://developer.yahoo.com/yui/treeview/">TreeView Control</a>,
we begin with a <code>&lt;div&gt;</code> containing a set of nested unordered lists <code>&lt;ul&gt;</code>
providing the basic tree structure.</p>
<p>Each &lt;li&gt; element in the markup will produce a Node.
List-items with plain text will produce regular TextNodes,
those with the className "expanded" will override the default of showing nodes collapsed.
The list-item with a link will also produce a TextNode with its <code>href</code> and <code>target</code> properties set accordingly.
The list-item containing a Date, being a string, would normally create a TextNode,
but it has been overridden by the use of the <code>yuiConfig</code> attribute to make it a DateNode and editable.
The final node contains formatted text which will produce an HTMLNode;
the whole has to be enclosed in a single HTML element to let the parser know how far it reaches.</p>
<textarea name="code" class="HTML" cols="60" rows="1"><div id="markup">
<ul>
<li class="expanded">List 0
<ul>
<li class="expanded">List 0-0
<ul>
<li>item 0-0-0</li>
<li><a target="_new" href="www.elsewhere.com" title="go elsewhere">elsewhere</a></li>
</ul>
</li>
</ul>
</li>
<li>List 1
<ul>
<li>List 1-0
<ul>
<li yuiConfig='{"type":"DateNode","editable":true}'>02/01/2009</li>
<li><span>item <strong>1-1-0</strong></span></li>
</ul>
</li>
</ul>
</li>
</ul>
</div></textarea>
<p>We create a new TreeView and render it.
The TreeView will read the existing HTML and build the nodes from it.
We also subscribe to the <code>dblClickEvent</code> to enable editing to prove the DateNode is really such and is editable.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">tree1 = new YAHOO.widget.TreeView("markup");
tree1.render();
tree1.subscribe('dblClickEvent',tree1.onEventEditNode);</textarea>
<p>Once we have a tree, we can read its definition, preserve it somehow and then build an identical tree from it.
In the second part we are building a couple of trees, one identical to the full tree
and another one from just a branch of it</p>
<textarea name="code" class="JScript" cols="60" rows="1">tree2 = new YAHOO.widget.TreeView("treeDiv2", tree1.getTreeDefinition());
tree2.render();
var branch = tree1.getRoot().children[1];
tree3 = new YAHOO.widget.TreeView("treeDiv3", branch.getNodeDefinition());
tree3.render();
</textarea>
<p>For <code>tree2</code> we have used the full tree definition from the first tree.
For <code>tree3</code> we have first located a branch, for this sample, the second branch from the root
and used its definition for the tree</p>
<p>Finally, in the last tree, we used an object literal to define the full tree.</p>
<textarea name="code" class="JScript" cols="60" rows="1">(new YAHOO.widget.TreeView("treeDiv4",[
'Label 0',
{type:'Text', label:'text label 1', title:'this is the tooltip for text label 1'},
{type:'Text', label:'branch 1', title:'there should be children here', expanded:true, children:[
'Label 1-0'
]},
{type:'Text',label:'YAHOO',title:'this should be an href', href:'http://www.yahoo.com', target:'somewhere new'},
{type:'HTML',html:'<a href="developer.yahoo.com/yui">YUI</a>'},
{type:'MenuNode',label:'branch 3',title:'this is a menu node', expanded:false, children:[
'Label 3-0',
'Label 3-1'
]}
])).render();
</textarea>
<p>Here we provide as a second argument to the constructor an array where each item can be either an
object literal or a simple string, such as <code>'Label 0'</code>,
which will be converted to a simple TextNode.</p>
<p>The items in the array can also be objects containing more detailed definitions for each node.
All require a <code>type</code> property using either a short-name such as <code>'Text'</code> or <code>'HTML'</code> (case-insensitive)
or the object name of the node type like <code>'MenuNode'</code>, which will be resolved to YAHOO.widget.MenuNode.</p>
<p>Object definitions allow precise control over the tree since any public property of each node can be specified,
for example, some nodes start expanded while others collapsed. We cannot have such expressiveness from plain HTML markup.</p>
<p>We have defined a couple of external links. In the first one, labeled <code>YAHOO</code>, the link has the
generic style of the rest of the nodes in the tree. In the second one, labeled <code>YUI</code>, we have used an HTMLNode
instead of a TextNode so TreeView copies that string into the node without adding further classNames so it gets a different look.</p>
<p>The last node, being a MenuNode, forces other branches to collapse when expanded. The other node with children, being a plain node
doesn't mind if other nodes remain expanded.</p>
<p>Nodes may contain a <code>children</code> property containing further node definitions.</p>
<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/?treeview&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="loggerModule" class="yui-skin-sam">
<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerDiv"></div>
</div>
<div id="examples">
<h3>TreeView Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../treeview/default_tree.html'>Default TreeView</a></li><li><a href='../treeview/dynamic_tree.html'>Dynamically Loading Node Data</a></li><li><a href='../treeview/folder_style.html'>Folder-Style TreeView Design</a></li><li><a href='../treeview/menu_style.html'>Menu-Style TreeView Design</a></li><li><a href='../treeview/customicons.html'>Using TreeView with Custom Icons</a></li><li><a href='../treeview/tv_tooltip.html'>TreeView with Tooltips</a></li><li class='selected'><a href='../treeview/tv_markup.html'>Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </a></li><li><a href='../treeview/tv_edit.html'>Inline Editing of TreeView Node Labels</a></li><li><a href='../treeview/tv_highlight.html'>Treeview Node Selection and Checkbox Example</a></li><li><a href='../menu/treeviewcontextmenu.html'>Adding A Context Menu To A TreeView (included with examples for Menu Family)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More TreeView Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/treeview/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_treeview.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/treeview.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
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