Issue when making a call to a web service using TypeScript

I've implemented the following TypeScript code:

/// <reference path="jquery.d.ts" />
interface INotificationService {
    serviceUrl: string;
    getNotifications(onNotificationReceived: (notifications: string) => any): void;
}
module GRCcontrol.Messaging {
    export class Notifier implements INotificationService {
        private serviceUrl: string;
        constructor(serviceUrl: string) {
            this.serviceUrl = serviceUrl;
            jQuery.support.cors = true;
        }
        getNotifications(onNotificationReceived: (notifications: string) => any) {
            var that = this;
            $.getJSON(that.serviceUrl, {}, function (response) {
                alert(response);
            }).fail(function (err) {
                alert(err.statusText);
            });
        }
    }
}
$(document).ready(function () {
    var notifier = new GRCcontrol.Messaging.Notifier("http://clwebsvr01/wp7test/api/user/getemail/P6dNT1EFOKYPtHxdPWgng2lKyMg=");
    notifier.getNotifications(function (notifications) {
        alert(notifications);
    });
});

This is how the JavaScript output looks like:

var GRCcontrol;
(function (GRCcontrol) {
    (function (Messaging) {
        var Notifier = (function () {
            function Notifier(serviceUrl) {
                this.serviceUrl = serviceUrl;
                jQuery.support.cors = true;
            }
            Notifier.prototype.getNotifications = function (onNotificationReceived) {
                var that = this;
                $.getJSON(that.serviceUrl, {
                }, function (response) {
                    alert(response);
                }).fail(function (err) {
                    alert(err.statusText);
                });
            };
            return Notifier;
        })();
        Messaging.Notifier = Notifier;        
    })(GRCcontrol.Messaging || (GRCcontrol.Messaging = {}));
    var Messaging = GRCcontrol.Messaging;
})(GRCcontrol || (GRCcontrol = {}));
$(document).ready(function () {
    var notifier = new GRCcontrol.Messaging.Notifier("http://clwebsvr01/wp7test/api/user/getemail/P6dNT1EFOKYPtHxdPWgng2lKyMg=");
    notifier.getNotifications(function (notifications) {
        alert(notifications);
    });
});

The issue here is that it keeps failing and returning status = 0 and statusText = error. I checked with Fiddler to confirm if the call was made successfully, and indeed Fiddler receives the response without issues.

How can I resolve this problem and make everything work smoothly?

Answer №1

It seems like the issue here was not related to TypeScript, but rather with how JavaScript/JQuery was handling a cors enabled ajax call.

Cors does not allow unrestricted access to cross-domain resources for security reasons. For more insights on this topic, refer to this SO post: Is it safe to use $.support.cors = true; in jQuery?

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