class AsyncManager {
    protected readonly url: string = "/admin/async";

    constructor(url?: string) {
        if (url !== undefined)
            this.url = url;
    }

    public getTaskList(onSuccess: Function, onError?: Function): void {
        let xhr = new XMLHttpRequest();
        xhr.open("GET", this.url + ".json", true);
        xhr.send();
        // @todo Continue
    }
}

let async: AsyncManager = new AsyncManager();

const url = "/admin/async";
let xhr = new XMLHttpRequest();
xhr.open("GET", url + ".json", true);
xhr.send();

xhr.onload = function () {
    if (xhr.status === 200) {

    }
}