Bootstrap dropdown selector attached to CartoDB SQL

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

#layer_selector {
        position: absolute;
        top: 20px;
        right: 20px;
        padding: 0;
      }
     
    </style>

</head>
    
  <body>
    <div id="map"></div>
    <div id="layer_selector" class="cartodb_infobox btn-group">
         <a class="btn dropdown-toggle" data-toggle="dropdown" href="#">Type de Culture
             <span class="caret"></span>
         </a>
         <ul class="dropdown-menu">
             <li><a href="#" data="tout" class="selected">Tout</a></li>
             <li><a href="#" data="ble">Ble</a></li>
             <li><a href="#" data="fourr">Fourrage</a></li>
             <li><a href="#" data="jache">Jacherre</a></li>
             <li><a href="#" data="mais">Mais</a></li>
         </ul>
    </div>
  </body>

<script src="https://libs.cartocdn.com/cartodb.js/v2/cartodb.js"></script>
  <script src="https://geosprocket.com/assets/bootstrap/js/bootstrap.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

// create layer selector
    function createSelector(layer) {
      var sql = new cartodb.SQL({ user: 'dai' });

var $options = $('#layer_selector li');
      $options.click(function(e) {

// get the area of the selected layer
        var $li = $(e.target);
        var crop = $li.attr('data');

// deselect all and select the clicked one
        $options.removeClass('selected');
        $li.addClass('selected');

// create query based on data from the layer
        var query = "select * from ag_survey_2011";
        if(crop !== 'tout') {
          query = "select * from ag_survey_2011 where " + crop + " > 0 ";
        }

// change the query in the layer to update the map
        layer.setQuery(query);
      });
    }

function main() {
      cartodb.createVis('map', 'https://dai.cartodb.com/api/v1/viz/11330/viz.json', {
          tiles_loader: true,
          center_lat: 34.88593094075317,
          center_lon: -3.0322265625,
          zoom: 8
      })
      .done(function(vis, layers) {
        // layer 0 is the base layer, layer 1 is cartodb layer
        createSelector(layers[1])
      })
      .error(function(err) {
        console.log(err);
      });

}

window.onload = main;

</script>

</html>

Modified http://libs.cartocdn.com/cartodb.js/v2/cartodb.js to a secure url

Modified http://geosprocket.com/assets/bootstrap/js/bootstrap.min.js to a secure url

Modified http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js to a secure url

https://libs.cartocdn.com/cartodb.js/v2/cartodb.js

https://geosprocket.com/assets/bootstrap/js/bootstrap.min.js

https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js