Knockout.js Trackable Observable

example.js

var model = ko.trackableObservable(value);

$(".cancel").click(function(){
    model.reset();
});

ko.trackableObservable.js

ko.trackableObservable = function (initValue) {
    var result = ko.observable(initValue);
    result.committedValue = ko.observable(initValue);
    result.commit = function () {
        result.committedValue(result());
    };
    result.reset = function () {
        result(result.committedValue());
    };
    return result;
};