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Showing content from https://github.com/pauldotknopf/JavaScriptViewEngine below:

pauldotknopf/JavaScriptViewEngine: An ASP.NET MVC ViewEngine for rendering markup in a JavaScript environment. Ideal for React and Angular server-side rendering.

An ASP.NET MVC (MVC Core 1, MVC 6) ViewEngine for rendering markup in a javascript environment. Ideal for React and Angular server-side rendering.

The main drive behind this is to support isomorphic/universal rendering. The idea is that your Model will be passed to a javascript method that will render markup in return. Imagine having a react component tree that is hydrated via a single immutable JSON structure, representing the initial state of the service-side rendered page.

There were existing projects out there that allowed us to render javascript. All of them had their issues.

NodeServices - https://github.com/aspnet/NodeServices
- pros
  - Supports ASP.NET 5 (ASP.NET Core 1)
  - .NET Core (Windows/Linux/Mac)
- cons
  - Too much .NET integration than what is needed
  - Razor is required
React.NET - https://github.com/reactjs/React.NET
- pros
  - Embedded javascript engine
  - Fast
- cons
  - Narrow focus (only React, not Angular)
  - Limited support for libraries
  - Opinionated
  - No .NET Core support.

Checkout the JavaScriptViewEngine.Samples repo!

Or, checkout the react-aspnet-boilerplate.

Getting started is pretty simple.

Add a reference to the JavaScriptViewEngine NuGet package.
Setup things app in your Startup.cs.

public class Startup
{
    private readonly IHostingEnvironment _env;

    public Startup(IHostingEnvironment env)
    {
        _env = env;
    }
        
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddJsEngine();
        services.Configure<RenderPoolOptions>(options =>
        {
            options.WatchPath = _env.WebRootPath;
            options.WatchFiles = new List<string>
            {
                Path.Combine(options.WatchPath, "default.js")
            };
        });
        services.AddMvc();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app)
    {
        app.UseJsEngine(); // this needs to be before MVC
            
        app.UseMvc(routes =>
        {
            routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

Create default.js in your WebRootPath that will be invoked when rendering.

module.exports = {
    renderView: function (callback, path, model, viewBag, routeValues) {
        callback(null, {
            html: "<html><head></head><body><p><strong>Model:</strong> " + JSON.stringify(model) + "</p><p><strong>ViewBag:</strong> " + JSON.stringify(viewBag) + "</p></body>",
            status: 200,
            redirect: null
        });
    },
    renderPartialView: function (callback, path, model, viewBag, routeValues) {
        callback(null, {
            html: "<p><strong>Model:</strong> " + JSON.stringify(model) + "</p><p><strong>ViewBag:</strong> " + JSON.stringify(viewBag) + "</p>"
        });
    }
};

Get rolling in MVC.

public class HomeController : Controller
{
    public IActionResult Index(string greeting = "Hello word!")
    {
        return View(new GreetingViewModel { Greeting = greeting });
    }
}

public class GreetingViewModel
{
    public string Greeting { get; set; }
}

This project uses Cake for building: http://cakebuild.net/

From a Powershell prompt: PS> ./build.ps1

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