FabricJS - how to get current canvas object in loadFromJSON callback?

Question

I have several canvases and i need to block all object selection after loading them. The problem is that loadFromJSON function is async and when it fires callback i variable is already last one so selection is being disabled only for last canvas.

var floorPlanS = ... -- array of json's
var canvas = [];
for(i=0;i<floorPlanS.length;i++) {
    jQuery('.floorPlans').append('<div cid="'+i+'"><canvas id="cFloorPlan'+i+'" width="800" height="516"></canvas></div>');
    canvas[i] = new fabric.Canvas('cFloorPlan'+i);
    canvas[i].loadFromJSON(floorPlanS[i], function() {
        for(o=0;o<canvas[i]._objects.length;o++) {
            canvas[i]._objects[o].selectable = false;
        }
        canvas[i].renderAll(); 
    });
}

Is there any way to get canvas object inside loadFromJSON callback?