index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>CartoDB.js Infobox Example</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <link rel="shortcut icon" href="http://cartodb.com/assets/favicon.ico" />
    <link rel="stylesheet" href="https://cartodb-libs.global.ssl.fastly.net/cartodb.js/v3/3.15/themes/css/cartodb.css" />
     <script src="https://cartodb-libs.global.ssl.fastly.net/cartodb.js/v3/3.15/cartodb.js"></script>

    <style>
      html, body, #map {
        height: 100%;
        padding: 0;
        margin: 0;
      }
    </style>

  </head>
  <body>
    <div id="map"></div>
      function main() {
        var map = L.map('map', {
          zoomControl: true,
          center: [0, 0],
          zoom: 2,
          search: true,
        });
        L.tileLayer('http://{s}.tile.stamen.com/watercolor/{z}/{x}/{y}.png', {
          attribution: 'Stamen'
        }).addTo(map);
       cartodb.createVis('map', 'https://team.cartodb.com/u/chandra/api/v2/viz/0249d564-6d3a-11e5-a49e-0e5db1731f59/viz.json', {legends:false})
       .done(function(vis, layers) {

             var sublayer = layers[1].getSubLayer(0);
            sublayer.set({ 'interactivity': ['name', 'age', 'city', 'country'] });

            vis.addOverlay({
              type: 'infobox',
              template: '<h3>{{name}}</h3><p>{{age}}</p>',
              width: 200,
              position: 'bottom|right'
            });


          }).on('error', function() {
            console.log("some error occurred");
          });
      }
      window.onload = main;
    </script>

  </body>
</html>