Backbone Memento Example

Originator.js

createMemento: function (hash) {
    var memento = new Memento({
        originator: this,
        state: this.changedAttributes(hash)
    });

    return memento;
},
    
//Sets a memento object to restore state.
//  Override this function to supply your own way to restore state.
setMemento: function (memento) {
    var state = memento.state;
    if (this.set) {
        this.set(state);
    }

    return this;
},
    
//Creates a memento and sends it along with an event to be stored then calls set
store: function (hash) {
    //Checks to see if there is anything in the hash before doing any work
    if ( !_.isEmpty(hash) ) {
        this.eventMap.trigger("Memento:Store", this.createMemento(hash));
        //Calls set after storing the delta
        this.set(hash);
    }

    return this;
}