gistfile1.js

var ItemCollection = Spine.Model.setup("Item", [ "itemToAdd", "allItems", "selectedItems" ]);
ItemCollection.extend(DataBind);

ItemCollection.include({
    addItem: function() {
        if (this.itemToAdd != "") { 
            this.allItems.push(this.itemToAdd);
            this.itemToAdd = "";
            this.save();
        }
    },
    removeSelected: function() {
        var allItems = this.allItems;
        this.selectedItems.forEach(function(item) {
            var index = allItems.indexOf(item);
            if (index >= 0) {
                allItems.splice(index,1);
            }
        });
        this.selectedItems = [];
        this.save();
    },
    sort: function() {
        this.allItems.sort();
        this.save();
    }
});

var Item = ItemCollection.create({ itemToAdd: "", allItems: [ "Fries", "Eggs Benedict", "Ham" ], selectedItems: [] });