JSONP with ASP.NET Web API

Question

I am working on creating a new set of services in ASP.MVC MVC 4 using the Web API. So far, it's great. I have created the service and gotten it to work, and now I am trying to consume it using JQuery. I can get back the JSON string using Fiddler, and it seems to be ok, but because the service exists on a separate site, trying to call it with JQuery errors with the "Not Allowed". So, this is clearly a case where I need to use JSONP.

I know that the Web API is new, but I'm hoping someone out there can help me.

How do I make a call to a Web API method using JSONP?

Answer 1

After asking this question, I finally found what I needed, so I am answering it.

I ran across this JsonpMediaTypeFormatter. Add it into the Application_Start of your global.asax by doing this:

var config = GlobalConfiguration.Configuration;
config.Formatters.Insert(0, new JsonpMediaTypeFormatter());

and you are good to go with an JQuery AJAX call that looks like this:

$.ajax({
    url: 'http://myurl.com',
    type: 'GET',
    dataType: 'jsonp',
    success: function (data) {
        alert(data.MyProperty);
    }
})

It seems to work very well.