selectedChanged.js

             // get current points
             var pointsRef = firebase.database().ref("lives/" + liveid + '/data/' + page);
             pointsRef.on("child_added", function(res){
                 var model = res.val();
                 if (model === null) {
                     console.log("model is: " + ms);
                 } else {
                     console.log("**************");
                     var keys = Object.keys(model);
                     for (var k = 0; k < keys.length; k++) {                         
                         if (!Array.isArray(objectsOrder[model[keys[k]].indexPos])){
                             objectsOrder[model[keys[k]].indexPos] = new Array();
                         }
                         objectsOrder[model[keys[k]].indexPos].push(model[keys[k]].point)
                         var plyne = new fabric.Polyline(objectsOrder[model[keys[k]].indexPos], {stroke: "red", strokeWidth: 4, fill: null});
                         //self.canvas.insertAt(plyne, model[keys[k]].indexPos);
                         self.canvas._objects[model[keys[k]].indexPos] = plyne;
                         self.canvas.renderAll();
                     }
                     // var plyne = new fabric.Polyline(m.plyne, {stroke: color, strokeWidth: width, fill: null});
                     // self.canvas.insertAt(plyne, m.indexPos);                                    
                 }
             });