Menu-Style TreeView Design
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Menu-Style TreeView Design</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/treeview/assets/skins/sam/treeview.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/treeview/treeview-min.js"></script>
<!--begin custom header content for this example-->
<!--bring in the folder-style CSS for the TreeView Control-->
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/treeview/assets/treeview-menu.css" />
<!-- Some custom style for the expand/contract section-->
<style>
#expandcontractdiv {border:1px dotted #dedede; background-color:#EBE4F2; margin:0 0 .5em 0; padding:0.4em;}
#treeDiv1 { background: #fff; padding:1em; margin-top:1em; }
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Menu-Style TreeView Design</h1>
<div class="exampleIntro">
<p>As with the Folder Style example, here we're using CSS to control the styling of our <a href="http://developer.yahoo.com/yui/treeview/">TreeView Control</a>'s node icons. The CSS and image assets for the Menu Style are available as part of the YUI download package.</p>
<p>This example also implements <code>MenuNode</code> instead of <code>TextNode</code> for node creation. Only one <code>MenuNode</code> can be open at a given depth at the same time. This creates an interaction in which nodes close up behind you as you open new ones, keeping the vertical size of the TreeView more compact during navigation.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<!-- markup for expand/contract links -->
<div id="expandcontractdiv">
<a id="collapse" href="#">Collapse all</a>
</div>
<div id="treeDiv1"></div>
<script type="text/javascript">
//an anonymous function wraps our code to keep our variables
//in function scope rather than in the global namespace:
(function() {
var tree; //will hold our TreeView instance
function treeInit() {
YAHOO.log("Example's treeInit function firing.", "info", "example");
//Hand off ot a method that randomly generates tree nodes:
buildRandomTextNodeTree();
//handler for collapsing all nodes
YAHOO.util.Event.on("collapse", "click", function(e) {
YAHOO.log("Collapsing all TreeView nodes.", "info", "example");
tree.collapseAll();
YAHOO.util.Event.preventDefault(e);
});
}
//This method will build a TreeView instance and populate it with
//between 3 and 7 top-level nodes
function buildRandomTextNodeTree() {
//instantiate the tree:
tree = new YAHOO.widget.TreeView("treeDiv1");
//create top-level nodes
for (var i = 0; i < Math.floor((Math.random()*4) + 3); i++) {
var tmpNode = new YAHOO.widget.MenuNode("label-" + i, tree.getRoot(), false);
//we'll delegate to another function to build child nodes:
buildRandomTextBranch(tmpNode);
}
//once it's all built out, we need to render
//our TreeView instance:
tree.draw();
}
//This function adds a random number <4 of child nodes to a given
//node, stopping at a specific node depth:
function buildRandomTextBranch(node) {
if (node.depth < 6) {
YAHOO.log("buildRandomTextBranch: " + node.index);
for ( var i = 0; i < Math.floor(Math.random() * 4) ; i++ ) {
var tmpNode = new YAHOO.widget.MenuNode(node.label + "-" + i, node, false);
buildRandomTextBranch(tmpNode);
}
}
}
//When the DOM is done loading, we can initialize our TreeView
//instance:
YAHOO.util.Event.onDOMReady(treeInit);
})();//anonymous function wrapper closed; () notation executes function
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
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