MVC4 Route map JavaScript file to controller

Question

Here is an example of what I am trying do.

Provide an MVC Route from test.js to a controller action e.g.

> http://localhost/MVCScripts/test.js?id=123

to the controller

> http://localhost/Home/RenderJavascript?id=123

The reason behind this is to produce a dynamic js file rendered from the server based on the id. The JS file will be linked to by being embedded into other websites.

I have tried setting the web.config to exclude the script folder in question:

<handlers>
     <add name="scripts" path="/MVCScripts/*" verb="GET" type="System.Web.Handlers.TransferRequestHandler" />
</handlers>

and then added a route such as:

routes.MapRoute(
            name: "EmbedCode",
            url: "MVCScripts/test.js",
            defaults: new { controller = "Home", action = "RenderJavascript", id = UrlParameter.Optional }
        );

When invoking

> http://localhost/MVCScripts/test.js?id=123

I just get

The controller for path '/MVCScripts/test.js' was not found or does not implement IController.

Note that my aim here is to use MVC Routing. Thanks

Darin Dimitrov · Accepted Answer · 2013-09-26 20:20:01Z

If you are running in IIS integrated pipeline mode make sure that you add the following handler to the <handlers> collection of your <system.webServer> node:

<system.webServer>
    <handlers>
        ...
        <add name="DynamicScript" path="MVCScripts/test.js" verb="GET" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
   </handlers>
</system.webServer>

This will ensure that the static .js extension will be routed through the managed ASP.NET pipeline instead of being directly served by IIS as a static file (and obviously not being found in your case). And when it gets served through the ASP.NET pipeline it will obviously hit your route that you must define before the default one:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
        name: "EmbedCode",
        url: "MVCScripts/test.js",
        defaults: new { controller = "Home", action = "RenderJavascript", id = UrlParameter.Optional }
    );

    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
    );
}

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