In this article I will explain how you can make cascading dropdowns with Knockout.js. Knockout.js is a JavaScript library which provides you some stuff to implement the MVVM pattern. Knockout provides you the following stuff:
Declarative bindings: (Easily associate DOM elements with model data using a concise, readable syntax);
Automatic UI Refresh: (When your data model's state changes, your UI updates automatically)
Dependency tracking: (Implicitly set up chains of relationships between model data, to transform and combine it)
Templating: (Quickly generate sophisticated, nested UIs as a function of your model data)
In the example below I use jQuery to get some json from the server.
The json data should be an array of objects containing a value and text property. As you can see I use the html5data-bind attribute to map my view model to my UI elements.
For example your ASP.NET MVC3 action could look like this.
I wrote the examples in notepad, so there could be some issues. However if I did my job well this should be all to let all the magic happen.
Didn't this knocked out a bunch of javascript code you would write normally?
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