How to create dirty flag functionality

Question

I want to create dirty flag functionality using knockout. I want to enable the save button only if something has changed. My view and my view model is exactly same as exampl

Answer 1

There is also the ko.editables plugin: https://github.com/romanych/ko.editables

var user = {
    FirstName: ko.observable('Some'),
    LastName: ko.observable('Person'),
    Address: {
        Country: ko.observable('USA'),
        City: ko.observable('Washington')
    }
};
ko.editable(user);

user.beginEdit();
user.FirstName('MyName');
user.hasChanges();          // returns `true`
user.commit();
user.hasChanges();          // returns `false`
user.Address.Country('Ukraine');
user.hasChanges();          // returns `true`
user.rollback();
user.Address.Country();     // returns 'USA'