KnockoutJS Essentials

Extending the product model

To validate our models using the Knockout Validation library, we are going to extend our model's attributes. Extenders are a basic feature of Knockout. Using extenders we can add some properties to our observables to increase their behavior. For more information on extenders, please refer to the following link:

http://knockoutjs.com/documentation/extenders.html

We are going to extend our product model with some properties that will allow us to validate data by following these steps:

1. Go to the models/Product.js file.
2. Update the name field. It should have at least three letters and should contain just letters, numbers, and dashes:

   _name = ko.observable(name).extend({ required: true, minLength: 3, pattern: { message: 'Hey ...