Knockout JS Model Inheritance

Question

I have three relatively similar knockout models in my application and I would like to extend a base model to combine common properties rather than repeat myself three times.

Answer 1

I guess you can do something like this:

var StandardItemModel = function (item, cartItemTypes) {
var self = this;
self.standard = new ItemModel(item);
self.isInCart = ko.computed(function () {
return cartItemTypes().indexOf(item.type) > -1;
}, self);

self.itemClass = ko.computed(function () {
 return self.isInCart() ? "icon-check" : "icon-check-empty";
 }, self);
}