Build legend in CartoDB using createLayer

Question

I'm not using createVis, but rather createLayer to generate my maps on the fly, but can't seem to figure out how to add a legend using something simple like legends: true, which is available when using createVis.

What's the best way to do this?

Answer 1

You can manually add Legends to the map using the objects in cdb.geo.ui.Legend

var densityLegend = new cdb.geo.ui.Legend.Density({
            title:   "<a href='http://www.fbi.gov/about-us/cjis/ucr/ucr'>Data From FBI Crime Reporting 2013</a>",
            left: "Low", right: "High", colors: [ "#FFFFB2", "#FED976", "#FEB24C", "#FD8D3C", "#FC4E2A", "#E31A1C", "#B10026"  ]
        });
        $('#map').append(densityLegend.render().el);

An example of doing this for a density legend is given here.