<!doctype html>
<html>
<head>
  <title>Network | Random nodes</title>

  <style type="text/css">
    body {
      font: 10pt sans;
    }
    #mynetwork {
        width: 600px;
        height: 600px;
      border: 1px solid lightgray;
    }
  </style>

  <script type="text/javascript" src="../../dist/vis.js"></script>
  <link href="../../dist/vis.css" rel="stylesheet" type="text/css" />

  <script type="text/javascript">
    var nodes = null;
    var edges = null;
    var network = null;

    function destroy() {
      if (network !== null) {
        network.destroy();
        network = null;
      }
    }

    function draw() {
      destroy();

      nodes = [];
      edges = [];
      var connectionCount = [];

      // randomly create some nodes and edges
      var nodeCount = document.getElementById('nodeCount').value;
      for (var i = 0; i < nodeCount; i++) {
          nodes.push({
          id: i,
          label: String(i)
        });

        connectionCount[i] = 0;

        // create edges in a scale-free-network way
        if (i == 1) {
          var from = i;
          var to = 0;
          edges.push({
            from: from,
            to: to
          });
          connectionCount[from]++;
          connectionCount[to]++;
        }
        else if (i > 1) {
          var conn = edges.length * 2;
          var rand = Math.floor(Math.random() * conn);
          var cum = 0;
          var j = 0;
          while (j < connectionCount.length && cum < rand) {
            cum += connectionCount[j];
            j++;
          }


          var from = i;
          var to = j;
          edges.push({
            from: from,
            to: to
          });
          connectionCount[from]++;
          connectionCount[to]++;
        }
      }
      // create a network
      var container = document.getElementById('mynetwork');
      var data = {
        nodes: nodes,
        edges: edges
      };
      var options = {stabilize:false};
      network = new vis.Network(container, data, options);

      // add event listeners
      network.on('select', function(params) {
        document.getElementById('selection').innerHTML = 'Selection: ' + params.nodes;
      });
      network.on('stabilized', function (params) {
        document.getElementById('stabilization').innerHTML = 'Stabilization took ' + params.iterations + ' iterations.';
      });
      network.on('startStabilization', function (params) {
        document.getElementById('stabilization').innerHTML = 'Stabilizing...';
      });
    }


  </script>
</head>

<body onload="draw();">
<form onsubmit="draw(); return false;">
  <label for="nodeCount">Number of nodes:</label>
  <input id="nodeCount" type="text" value="25" style="width: 50px;">
  <input type="submit" value="Go">
</form>

<br>

<div id="mynetwork"></div>

<p id="selection"></p>
<p id="stabilization"></p>
</body>
</html>