Web

Convention based MVVM with Knockout

One of my most popular Open source projects, FreePIE, is a WPF application and it utilizes a library called Caliburn.Micro. The main idea for that library is to minimize the use of explicit declared bindings and use conventions to implicit bind to the ViewModel under the hood. As an example, if you have a button called Save and a method called Save on your VM, Caliburn.Micro will make sure these are bound.
This is a welcomed tool since XAML bindings are, to say the least, verbose.

Bindings get even more verbose in the Knockout world because of the fact that you can write inline JavaScript in the bindings, fact is the entire data-bind attribute is inline JavaScript that is executed by Knockout. I’ve seen that bindings like these and worse are common out there.

<button data-bind="enable: errors().length === 0">Save</button>

I started to write a Convention based library called Knockout.BindingConventions a year ago and I added support for Knockout 3.0 a while back. Even though the library isn’t new I thought I could write about it, it’s a good way to get to know the inner working of Knockout and also convention over configuration. (more…)