Automatically Adding CSS and JavaScript Files to .Net Core Layout Views

Question

Automatically Adding CSS and JavaScript Files to .Net Core Layout Views

Previously, with the standard .NET platform, we were able to include CSS and JS files based on action and controller names using code like this:

string scriptSource = Url.Content(string.Format("~/js/page/{0}/{1}.js", controllerName, actionName));
if (System.IO.File.Exists(Server.MapPath(scriptSource)))
{
  <script type="text/javascript" src="@scriptSource"></script>
}

We would insert these codes in the Layout and it worked as long as the js folder and file names matched the controller and action names.

Recently, I upgraded the project to .NET Core (2.1) and implemented dependency injection in the BaseController to access the Server.MapPath value. However, I encountered difficulties reaching from the _Layout view to the BaseController or codebehind to get Server.MapPath. If anyone has successfully accomplished this, please share your solution.

javascript c#css asp.net-core

Answer 1

Answer №1

If you are working with ASP.NET Core, it's important to note that the traditional Server.MapPath method is not recommended. A better practice is to utilize the IHostingEnvironment interface.

For instance, in the _Layout.cshtml file, consider implementing the following:

@using Microsoft.AspNetCore.Hosting
@inject IHostingEnvironment environment
@{
    string path = string.Format("js/page/{0}/{1}.js", controllerName, actionName);
}
@if (System.IO.File.Exists(System.IO.Path.Combine(environment.WebRootPath, path)))
{
    <!-- The file exists here... -->
}

In your controller class, you can inject the IHostingEnvironment through the constructor like this:

public class HomeController : Controller
{
    private readonly IHostingEnvironment _environment;

    public HomeController(IHostingEnvironment environment)
    {
        _environment = environment;
    }

    public IActionResult Index()
    {
        string path = System.IO.Path.Combine(_environment.WebRootPath, "js/page/...");

        return View();
    }
}

Answer 2

If you are working with ASP.NET Core, it's important to note that the traditional Server.MapPath method is not recommended. A better practice is to utilize the IHostingEnvironment interface.

For instance, in the _Layout.cshtml file, consider implementing the following:

@using Microsoft.AspNetCore.Hosting
@inject IHostingEnvironment environment
@{
    string path = string.Format("js/page/{0}/{1}.js", controllerName, actionName);
}
@if (System.IO.File.Exists(System.IO.Path.Combine(environment.WebRootPath, path)))
{
    <!-- The file exists here... -->
}

In your controller class, you can inject the IHostingEnvironment through the constructor like this:

public class HomeController : Controller
{
    private readonly IHostingEnvironment _environment;

    public HomeController(IHostingEnvironment environment)
    {
        _environment = environment;
    }

    public IActionResult Index()
    {
        string path = System.IO.Path.Combine(_environment.WebRootPath, "js/page/...");

        return View();
    }
}

Automatically Adding CSS and JavaScript Files to .Net Core Layout Views

Answer №1

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