<!doctype html>
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								<html>
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								<head>
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								    <title>Network | Clustering</title>
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								    <script type="text/javascript" src="../dist/vis.js"></script>
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								    <style type="text/css">
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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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								        p {
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								            max-width: 600px;
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								        }
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								        h4 {
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								            margin-bottom: 3px;
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								        }
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								    </style>
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								</head>
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								<body>
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								<div id="mynetwork"></div>
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								<script type="text/javascript">
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								    // create an array with nodes
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								    var nodes = [
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								        {id: 4, label: '4'},
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								        {id: 5, label: '5'},
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								        {id: 7, label: '7'},
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								        {id: 9, label: '9'},
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								        {id: 10, label: '10'},
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								        {id: 101, label: '101'},
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								        {id: 102, label: '102'},
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								        {id: 103, label: '103'}
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								    ];
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								    // create an array with edges
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								    var edges = [
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								        {from: 10, to: 4},
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								        {from: 7, to: 5},
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								        {from: 9, to: 7},
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								        {from: 10, to: 9},
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								        {from: 101, to: 102},
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								        {from: 102, to: 103}
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								    ];
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								    // create a network
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								    var container = document.getElementById('mynetwork');
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								    var data = {
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								        nodes: nodes,
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								        edges: edges
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								    };
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								    var options = {layout: {randomSeed: 8}};
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								    var network = new vis.Network(container, data, options);
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								    // if we click on a node, we want to open it up!
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								    network.on("selectNode", function (params) {
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								        if (params.nodes.length == 1) {
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								            if (network.isCluster(params.nodes[0]) == true) {
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								                network.openCluster(params.nodes[0])
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								            }
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								        }
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								    });
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								    function a() {
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								        var clusterOptionsByData = {
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								            joinCondition: function (node) {
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								                if (node.id == 4 || node.id == 101)
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								                    return true;
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								                return false;
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								            },
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								            clusterNodeProperties: {id: "c1", label: 'c1'}
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								        }
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								        network.cluster(clusterOptionsByData);
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								    }
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								   function b() {
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								       var clusterOptionsByData2 = {
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								           joinCondition: function (node) {
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								               if (node.id == 'c1' || node.id == 5)
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								                   return true;
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								               return false;
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								           },
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								           clusterNodeProperties: {id: "c2", label: 'c2'}
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								       }
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								       network.cluster(clusterOptionsByData2);
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								   }
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								    a()
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								    b()
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								    network.openCluster("c2")
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								</script>
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								<input type="button" value="a" onclick="a()">
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								<input type="button" value="b" onclick="b()">
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								</body>
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								</html>
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