Openlayers 3: Select a feature programmatically

Question

I am trying to upgrade my system from Openlayers 2 to Openlayers 3 and I have having one particular issue that I cannot seem to figure out.

My application has a grid and

Answer 1

1. Add a select interaction to your map.

   var selectInteraction = new ol.interaction.Select();
   map.addInteraction(selectInteraction);
   

2. Add any features you want to select to the select interaction's feature array.

   selectInteractions.getFeatures().push(featureToSelect);