CartoDB not showing title or description (or other options)

Question

I'm using CartoDB and I can only get one option every to work cartodb_logo. The rest seem to be ignored. Here's the relevant part of my code. What is wrong with this to cause title and description to be ignored (not on my map)?

var layerSource = {
        user_name: 'myname',
        type: 'cartodb',

        sublayers: [{
            sql: "SELECT * FROM mydata",

            cartocss: "#mydata{marker-width: 10; marker-line-color: #FFF; marker-line-width: 0.5; marker-line-opacity: 1; marker-fill-opacity: 1.0; }"
        }]

    };
    var options = {

        https: true,
        infowindow: true,
        cartodb_logo: false, //this works fine
        title: "testing title", //this isn't rendered on map
        description: "testing description", //this isn't rendered on map
        shareable: true, //no sharing buttons shown
        legends: true //no legends either
    };
    var map_object = new L.Map('test_heat', {
        center: [39.8282, -98.5795],
        zoom: 5,
    });
    L.tileLayer('https://cartodb-basemaps-{s}.global.ssl.fastly.net/light_all/{z}/{x}/{y}@2x.png', {

        attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>'
    }).addTo(map_object);

    cartodb.createLayer(map_object, layerSource, options)
        .addTo(map_object)
        .on('done', function(layer) {
            cdb.vis.Vis.addInfowindow(map_object, layer.getSubLayer(0), options, ['cartodb_id', 'number_of_cases'], {
                infowindowTemplate: $('#infowindow_template').html()
            });
            var sublayer = layer.getSubLayer(0);
            sublayer.setInteraction(true);
            sublayer.on('featureClick', function(e, latlng, pos, data) {
                //alert("Hey! You clicked " + data.cartodb_id);
            });
        })
        .done(function(data) {

        });

Answer 1

As Chris says, you cannot use them as straightforward as with createVis, but there's a possibility.

You need to add a new overlay of type Header, as follows (add this inside the .on('done') callback of createLayer):

  var i = new cdb.geo.ui.Header({

    model: new cdb.core.Model({
   extra: {
     title: "Title",
     description: "Description",
     show_title: true,
     show_description: true
   }
 }),
 template: cdb.core.Template.compile(
  ' \
 <div class="content">\
 <div class="title">{{{ title }}}</div>\
 <div class="description">{{{ description }}}</div>\
 </div>',
 'mustache'
 )
  });
  $('body').append(i.render().el);

Probably you'll need to add also some CSS in order for the Header to appear at the right position. I made it work for my example with:

body > div.cartodb-header{
  display: none;
  position: absolute;
  top:0px;
  width: 100%;
  background-color: rgba(0,0,0,.5);
  font-family: 'Helvetica Neue',Helvetica,sans-serif;
  line-height: normal;
  z-index: 99999;
 }

This example (with the same code) is available also here.

Answer 2

You're using createLayer() to build your map, so title and description are not valid options.

You can use these options when using createVis(), but not with createLayer().

Check out the docs here