<!doctype html>
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								<html>
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								<head>
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								    <title>Network | Hierarchical layout</title>
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								    <style type="text/css">
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								        body {
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								            font: 10pt sans;
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								        }
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								        #mynetwork {
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								            width: 600px;
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								            height: 600px;
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								            border: 1px solid lightgray;
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								        }
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								    </style>
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								    <script type="text/javascript" src="../exampleUtil.js"></script>
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								    <script type="text/javascript" src="../../../dist/vis.js"></script>
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								    <link href="../../../dist/vis.css" rel="stylesheet" type="text/css"/>
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								    <script type="text/javascript">
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								        var nodes = null;
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								        var edges = null;
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								        var network = null;
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								        function destroy() {
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								            if (network !== null) {
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								                network.destroy();
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								                network = null;
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								            }
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								        }
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								        function draw() {
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								            destroy();
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								            // randomly create some nodes and edges
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								            var nodeCount = document.getElementById('nodeCount').value;
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								            var data = getScaleFreeNetwork(nodeCount)
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								            // create a network
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								            var container = document.getElementById('mynetwork');
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								            var directionInput = document.getElementById("direction").value;
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								            var options = {
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								                layout: {
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								                    hierarchical: {
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								                        direction: directionInput
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								                    }
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								                }
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								            };
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								            network = new vis.Network(container, data, options);
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								            // add event listeners
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								            network.on('select', function (params) {
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								                document.getElementById('selection').innerHTML = 'Selection: ' + params.nodes;
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								            });
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								        }
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								    </script>
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								    <script src="../../googleAnalytics.js"></script>
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								</head>
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								<body onload="draw();">
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								<h2>Hierarchical Layout - Scale-Free-Network</h2>
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								<div style="width:700px; font-size:14px; text-align: justify;">
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								    This example shows the randomly generated <b>scale-free-network</b> set of nodes and connected edges from example 2.
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								    In this example, hierarchical layout has been enabled and the vertical levels are determined automatically.
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								</div>
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								<br/>
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								<form onsubmit="draw(); return false;">
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								    <label for="nodeCount">Number of nodes:</label>
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								    <input id="nodeCount" type="text" value="25" style="width: 50px;">
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								    <input type="submit" value="Go">
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								</form>
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								<p>
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								    <input type="button" id="btn-UD" value="Up-Down">
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								    <input type="button" id="btn-DU" value="Down-Up">
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								    <input type="button" id="btn-LR" value="Left-Right">
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								    <input type="button" id="btn-RL" value="Right-Left">
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								    <input type="hidden" id='direction' value="UD">
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								</p>
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								<script language="javascript">
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								    var directionInput = document.getElementById("direction");
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								    var btnUD = document.getElementById("btn-UD");
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								    btnUD.onclick = function () {
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								        directionInput.value = "UD";
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								        draw();
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								    }
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								    var btnDU = document.getElementById("btn-DU");
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								    btnDU.onclick = function () {
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								        directionInput.value = "DU";
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								        draw();
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								    };
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								    var btnLR = document.getElementById("btn-LR");
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								    btnLR.onclick = function () {
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								        directionInput.value = "LR";
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								        draw();
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								    };
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								    var btnRL = document.getElementById("btn-RL");
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								    btnRL.onclick = function () {
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								        directionInput.value = "RL";
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								        draw();
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								    };
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								</script>
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								<br>
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								<div id="mynetwork"></div>
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								<p id="selection"></p>
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								</body>
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								</html>
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