I am trying to create a simple form with Knockoutjs that will pass a bit of user information with AJAX.  

Does someone have an example that has three fields (firstname, lastname, postal-code). It can take these three fields from the server if available or load blank. Then take these same three fields put them in an object and post with AJAX. 

```
    function UserInfo(data){
       this.firstname = ko.observable(data.firstname);
       this.lastname = ko.observable(data.lastname);
       this.postal-code = ko.observable(data.postal-code);
     }
     function UserInfoViewModel()
     {
        //Do stuff here to save up
     }

```

I am really just looking for a simple example. But everytime I look it is loading arrays of stuff. The examples seem to just skip the standard form example with some AJAX. If I can see a best practise way of basically making a crud form I can run with it.