ASP.NET MVC Pass mutiple params from getJson to controller

Question

Hi,

I am making a call to a controller action in javascript using the getJson method. I need to pass two parameters to my action method on the controller, but I am struggling to do so. I do not fully understand the routing tables and not sure if this is what I need to use to get this working. Please see example below of what I am trying to do.

var action = "<%=Url.Content('~/Postcode/GetAddressResults/')%>" + $get("Premise").value + "/" + $get("SearchPostcode").value
        $.getJSON(action, null, function(data) {
        $("#AddressDropDown").fillSelect(data);
    });

This is my route which I don't understand how to make use of...

routes.MapRoute(
                "postcode",
                "Postcode/GetAddressResults/{premise}/{postcode}",
                new { controller = "Motor", action = "GetAddressResults", premise = "", postcode = "" });

Answer 1

You're definitely on the right path, though I would need to see your controller to know for sure. It would need to look something like this:

public ActionResult GetAddressResults(string premise, string postcode)
{
  //Do something.
  return Json(AddressService.GetResultsOfSomeKind(premise, postcode);
}

Set a breakpoint on your ActionResult so you know it's being called. If it's not, use Firefox and check the Error Console for syntax errors (the code you posted has some).

UPDATE:

What is

$get("Premise").value?

To get an input's value via jQuery, use:

$("#fieldid").val();

I recommend using the Firebug plugin for Firefox. That way you'll know exactly at which point your javascript is breaking. Most likely you'll find that your "var action =" statement is not properly appending the form field values on the client side before the $.getJSON call sends a request to your controller.

Answer 2

Hi, thanks my controller method looks exactly as above but the parameter values posted are always passed as null. I really don't understand this or really how to hook up the routing. Please help!