Promise API example in native javascript

promise.js

    function getGithubUserInfo(username) {

        return new Promise(function (resolve, reject) {
            // Do the usual XHR stuff
            var url = "https://api.github.com/users/" + username;

            var req = new XMLHttpRequest();
            req.open('GET', url);

            req.onload = function () {
                // This is called even on 404 etc
                // so check the status
                if (req.status == 200) {
                    // Resolve the promise with the response text
                    resolve(req.response);
                }
                else {
                    // Otherwise reject with the status text
                    // which will hopefully be a meaningful error
                    reject(Error(req.statusText));
                }
            };

            // Handle network errors
            req.onerror = function () {
                reject(Error("Network Error"));
            };

            // Make the request
            req.send();
        });
    }

    getGithubUserInfo("umayr")

            .then(function (response) {
                console.log("Success");
                console.log(response);

                bindResults(response);

            }, function (error) {
                console.error("Failed");
                console.error(error);

                bindResults(error);

            });

    function bindResults(result) {
        var _pre = document.createElement('pre');
        _pre.innerHTML = result;
        document.body.appendChild(_pre);

    }