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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
  <script src="https://raw.github.com/SteveSanderson/knockout/master/build/output/knockout-latest.debug.js" type="text/javascript"></script>
  <script src="https://raw.github.com/SteveSanderson/knockout.mapping/master/build/output/knockout.mapping-latest.js" type="text/javascript"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <div data-bind="foreach: Users">
    <p>Name: <input type="text" data-bind="value: Name" name="Name"></p>
    <p>Age: <input type="text" data-bind="value: Age" name="Name"></p>
  
    <p>Name: <span data-bind="text: Name"></span></p>
    <p>Age: <span data-bind="text: Age"></span></p>
  
    <select multiple="true" data-bind="options: $root.Colors, selectedOptions: ColorIds, optionsText: 'Name', optionsValue: 'ColorId'"></select>
  </div>
  <a href="#" data-bind="click: addUser">Add User</a>
</body>
</html>
 
var viewModel = {
  Users: [
    {
      "Name":"JC",
      "Age":24,
      "ColorIds":[1, 2]
    },
    {
      "Name":"Albert",
      "Age":83,
      "ColorIds":[2]
    }
  ],
  Colors:[
    {"ColorId":1,"Name":"Red"},
    {"ColorId":2,"Name":"Blue"}
  ]
};
​
window.onload = function(){
  
  //document.writeln(data[0].Colors[0].Name);
  
  //if I map anything to ko.observable, it would be sent through ko.toJSON... so that means that Color stuff should NOT be mapped, especially because that's not what MVC is asking, but rather List<Colors>...
  
  viewModel.Users = ko.mapping.fromJS(viewModel.Users);
  
  
  viewModel.addUser = function(){
    var obsUser = ko.mapping.fromJS({
      Name: "Piet",
      Age: 3,
      ColorIds: []
    });
    viewModel.Users.push(obsUser);
  }
  
  ko.applyBindings(viewModel);
  
};
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