ko.onDemandObservable

• ko.onDemandObservable
• ko.onDemandObservableArray

##Example

function Tab(id, name) {
    this.id = id;
    this.name = ko.observable(name);
    //sample of using an on-demand observable here
    this.details = ko.onDemandObservable(this.getDetails, this);
}

Tab.prototype.getDetails = function() {
    $.ajax({
        type: 'POST',
        url: '/echo/json/',
        data: {
            json: ko.toJSON({
                details: new Date().toLocaleTimeString() + " " + this.name() + fakeText
            }),
            delay: 1
        },
        context: this,
        success: function(data) {
            this.details(data.details);
        },
        dataType: 'json'
    });
};