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#Url.Action is null or "" in javascript when page loads

I have this function located in a controller called AccountCodes.
[ValidateAntiForgeryToken]
[HttpPost]
public async Task<ActionResult> Process()
{
JsonResult result = new JsonResult(null);
List<string> uploadResults = new List<string>();
return Ok(uploadResults);
}
My intention is to use dropzone to push files to this function. When I try to load the url in the razor view in a variable like this:
var url = "#Url.Action("Process", "AccountCodes",new { area="Configurations"})";
However, when I load the page and look at the console, the url is always "". Am I missing something?
EDIT:
This is where I put the javascript code:
$(document).ready(function () {
var url = "#Url.Action("Process", "AccountCodes",new { area="Configurations"})";
$("#reset").attr("disabled", true);
});

Your code is correct. It may because that you have some wrong global configuration.
Please verify the following things:
Step 1: Check your application
Use MVC in your start up:
// Startup.cs
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
// Other middlewares.
app.UseMvcWithDefaultRoute();
}
Step 2: Check your controller
Make sure there is a controller named AccountCodesController.
Make sure AccountCodesController extends Controller.
Check your routes. If you specify [Route("Something")] to your controller, make sure it is absolutely correct.
Step 3: Try adding a route to your action.
Adding an attribute [Route('SomeAction')] to your action Process might solves this.
Step 4: Check your area existance
Please make sure your controller is located in correct area as this document mentioned: https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/areas?view=aspnetcore-2.2#areas-for-controllers-with-views .
namespace MVCareas.Areas.Products.Controllers
{
[Area("Products")]
public class ManageController : Controller

How to reset a form after submission using Controller As syntax

After adding an object via a form, I would like to reset the form so the user can add another. I've tried $setPristine() but can't figure out the syntax. As of now, I have just set the location path back to the same page, but that of course doesn't reset anything. Also wondering if $setPristine is the correct way. Here is my save function.
export class AddCarController {
public newCar;
public save() {
this.carService.save(this.newCar).then(() => { this.$location.path('/addCarPage') });
}
constructor(
private carService: MyApp.Services.CarService,
private $location: angular.ILocationService
) { }
}

In angular Your can create model in just in html and also in controller or on both places
If you have created Model in html
$scope.newCar = {} //this will empty whole ui model object
If you have created Model In Javascript Controller
$scope.newCar = new carModel() //this will create new car object with default values , if you have model in controller
Navigate Back And Forth - Not Recommended

How can I handle a dynamic viewModel in my controller?

In my controller, my create method takes a viewModel that inherits from DynamicObject. The reason is that I need static properties on the model, but I may also add things to it via JavaScript before I pass it to the controller.
So, I have:
public class MyViewModel: DynamicObject {
public string id {get;set;}
}
[HttpPost]
public IHttpActionResult Create(MyViewModel viewModel) {
// save to Db
}
From the JavaScript (using Angular), I've passed in this viewmodel:
var vm = { id: 1, name: "Jim"};
However, this does not work and is throwing me this error:
[{"PropertyName":null,"ErrorMessage":null,"ErrorCode":null,"AttemptedValue":null,"CustomState":null}]
I haven't found an example of what I'm trying to do, but I would think making an object dynamic would allow for this. What am I missing here?

Call Action in Controller From View and send parameter

I am trying to call a method inside a controller in MVC from a javascript action. The javascript action is supposed to invoke this method inside the controller and send some parameters to it.
My Javascript code looks like this:
location.href = '#Url.Content("~/Areas/MyArea/MyMethod/"+Model.MyId)';
My Method is defined as follows:
[HttpGet]
public ActionResult MyMethod(int? MyId)
{
doSomething(MyId);
return View("MyView");
}
However, when i debug the application, when the method is called the MyId parameter is passed as null and not as the current value of the MyId parameter in my model. What can I do to correctly send or retrieve this value? Thanks!

In your route definition I suppose that the parameter is called {id} and not {MyId}:
public override void RegisterArea(AreaRegistrationContext context)
{
context.MapRoute(
"MyArea_default",
"MyArea/{controller}/{action}/{id}",
new { action = "Index", id = UrlParameter.Optional }
);
}
So try to be more consistent and adapt your controller action parameter name accordingly:
[HttpGet]
public ActionResult MyMethod(int? id)
{
doSomething(id);
return View("MyView");
}
Also you probably wanna use url helpers instead of hardcoding some url patterns in your javascript code:
window.location.href = '#Url.Action("MyMethod", "SomeControllerName", new { area = "MyArea", id = Model.MyId })';
The Url.Content helper is used to reference static resources in your site such as javascript, css and image files. For controller actions it's much better to use the Url.Action helper method.

MVC Razor get values from controller in a view for javascript

I have to get values from a controller method in a view to write into some javascript. In web pages it is as simple as <%=functionName()%>. Is there a way to do this in MVC. I cannot use the model because the javascript has to be available on page load. Any insights appreciated.

Is there a way to do this in MVC
Yes, of course.
I cannot use the model because the javascript has to be available on page load.
Of course that you can use a view model, there's nothing that would prevent you from doing so. So you start by defining it:
public class MyViewModel
{
public string Foo { get; set; }
}
then have a controller action that will populate this view model and pass it the view:
public ActionResult Index()
{
var model = new MyViewModel();
model.Foo = "Hello World";
return View(model);
}
and finally have a strongly typed view to this view model in which:
#model MyViewModel
<script type="text/javascript">
$(function() {
var foo = #Html.Raw(Json.Encode(Model.Foo));
alert(foo);
});
</script>
But now let's suppose that you don't want to pollute your view with javascript but have it in a separate js file instead (which of course is the correct way).
You could embed the value somewhere in your DOM, for example using HTML5 data-* attributes:
<div id="foo" data-model="#Html.Raw(Html.AttributeEncode(Json.Encode(Model)))">
Click me to surprise you
</div>
and then in a separate javascript subscribe to the click event of this element and read the data-* attribute in which we have JSON serialized the entire view model:
$(function() {
$('#foo').click(function() {
var model = $(this).data('model');
alert(model.Foo);
});
});