fabric.js make object(s) unselectable

gistfile1.txt

Source: http://stackoverflow.com/questions/33831088/fabric-canvas-make-my-1st-object-always-unselectable?rq=1

//lowest object unselectable
var objectx = canvas.getObjects();
objectx[0].selectable = false;

//highest object unselectable
var objectx = canvas.getObjects();
objectx[objectx.length - 1].selectable = false;

Source: http://stackoverflow.com/questions/11619626/how-to-make-objects-in-canvas-unselectable?rq=1
//all objects unselectable
canvas.deactivateAll();
canvas.renderAll();
canvas.forEachObject(function(object){ 
       object.selectable = false; 
});