namespace MyNamespace.Knockout
{
  public class BeginKnockoutLoadingContainerWriter : IDisposable
  {
    protected ViewContext _viewContext;

    public BeginKnockoutLoadingContainerWriter(ViewContext context)
    {
      if (context == null)
        throw new ArgumentNullException("context");

      _viewContext = context;

      // Write the html
      _viewContext.Writer.Write("<div>");
      _viewContext.Writer.Write("<div data-bind='visible: false'>");
      _viewContext.Writer.Write("Loading <img src='/assets/img/ajax-loader.gif' alt='Loading Spinner'/>");
      _viewContext.Writer.Write("</div>");
      _viewContext.Writer.Write("<div style='display:none' data-bind='visible: true'>");

      return;
    }

    public void Dispose()
    {
        _viewContext.Writer.Write("</div></div>");
    }
  }

  public static class LayoutHelpers
  {
    public static BeginKnockoutLoadingContainerWriter BeginKnockoutLoadingContainer(this HtmlHelper html)
    {
      return new BeginKnockoutLoadingContainerWriter(html.ViewContext);
    }
  }
}