Function get_request

web_server/public/javascripts/config.js:477–499

(url, callback)

}

function get_request(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.addEventListener("error", errorHandler);
    xhr.onreadystatechange = function () {
        if (xhr.readyState === 4 && xhr.status === 200) {
            try {
                var myObj = JSON.parse(xhr.responseText);
            } catch (err) {
                document.getElementById('errorMessage').innerHTML = "<b>Error: Bad JSON! <pre>" + err.message + "</pre></b>";
                return;
            }
            callback(myObj);
        } else if (xhr.status === 404) {
            callback([]);
        } else if (xhr.status === 500) {
            document.getElementById('errorMessage').innerHTML = xhr.responseText;
        }
    };

    xhr.open("GET", url);
    xhr.send();
    return;
}