console.log("utils.js loaded");


function ajaxRequest(type, url, callback, data = null)
{
    let xhr;
    // Create XML HTTP request.
    xhr = new XMLHttpRequest();
    if (type == 'GET' && data != null)
        url += '?' + data;
    xhr.open(type, url);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

    // Add the onload function.
    xhr.onload = () =>
    {
        switch (xhr.status)
        {
            case 200:
            case 201:
                callback(JSON.parse(xhr.responseText));
                break;
            case 404:
                alert("Erreur 404: Page non trouvée");
                break;
            case 500:
                alert("Erreur 500: Erreur interne du serveur");
                break;
            default:
                alert("Erreur: " + xhr.status);
                break;
        }
    };

    // Send XML HTTP request.
    xhr.send(data);
}