CODEWITHSUNDEEP
asp.net-mvcasp.net-mvc-4razordynamicasp.net-mvc-partialview
ydh
ydh

Reputation: 68

Render dynamic class value in MVC layout

I'm having an MVC layout pages which looks roughly like this

<!DOCTYPE HTML
<html class="prod">
    <head>
    </head>
    <body>
    </body>
</html>

I want to render the value of class attribute (prod) dynamically based on something returned from my controller.

So far, I tried variations on the following without success

Controller

[ChildActionOnly]
[AllowAnonymous]
public PartialViewResult Environment()
{
    return PartialView("Environment", "prod");
}

View

@model string 
@Model

Layout

<html class="@{ Html.RenderAction("Environment", "Site"); }">

This actually generates the following

<htmlprod class=""></htmlprod>
<html>
</html>

The same thing happens when I use a ContentResult. To be clear, I do not want to use a Viewbag.

I want to generate a raw HTML string and display that using a PartialView or something similar. The actual value is retrieved through a parameter in the constructor of the controller (ioc).

Upvotes: 0

Views: 1595

Answers (2)

Erik Philips
Erik Philips

Reputation: 54628

You vague question seems to have some deficiencies. Controllers shouldn't be in charge of what environment the application is executing in. I would probably do:

Global.asax:

public class MvcApplication : System.Web.HttpApplication
{
  private const string Environment = "Environment";

  protected void Application_Start()
  {
    this.Application.SetEnvironment(Configuration.AppSettings[Environment]);
  }
}

HttpApplicationStateExtensions.cs

internal static HttpApplicationStateExtensions
{
  private const string Environment = "Environment";

  public static void SetEnvironment(this HttpApplicationState state,
    string environment)
  {
    state.Application[Environment] = environment;
  }
  public static string GetEnvironment(this HttpApplicationState state)
  {
    var result = state.Application[Environment];
    return result;
  }
}

WebViewPageExtensions.cs

internal static WebViewPageExtensions
{
  private const string Environment = "Environment";

  public static string GetEnvironment(this WebViewPage page)
  {
    var result = page.AppState[Environment];
    return result;
  }
}

Usage:

<html class="@GetEnvironemnt()">
</html>

Upvotes: 0

Shyju
Shyju

Reputation: 218732

You do not need a partial to return you the class name. You may set the class name to the dynamic ViewBag dictionary and use that in your layout.

public ActionResult Index()
{
  ViewBag.HtmlClass="prod";
  return View();
}

And in your Layout

<html class="@ViewBag.HtmlClass">

</html>

If you do not wish to use ViewBag, You can create a child action method which simply returns a string. 

[ChildActionOnly]
public string Environment()
{
    return "production";
}

And in your layout,

<html class="@Html.Action("Environment","Home")">
</html>

Upvotes: 1

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