XHR Request

request.js

var request = function (options) {

    // just in case
    options = options || {};

    var url = options.url,
        method = options.method || 'GET',
        onSuccess = options.onSuccess,
        onError = options.onError,
        params = options.params,
        formData = options.formData || null,
        formDataParams = options.formDataParams,
        credentials = options.credentials || false,
        xmlResponse = options.xmlResponse || false,
        jsonResponse = options.jsonResponse || false,
        asynchronous = options.asynchronous || true,
        originalResponse = options.originalResponse || false;


    if (options.onSucces) {
        onSuccess = options.onSucces;
    }



    if (typeof params !== 'undefined') {

        var paramsParts = [];
        for (var paramName in params) {

            var paramValue = params[paramName],
                paramString = paramName + '=' + paramValue;

            paramsParts.push(paramString);
        }

        var paramsString = paramsParts.join('&');

        var urlHasParams = (url.indexOf('?') !== -1);
        if (urlHasParams) {
            url += '&' + paramsString;
        } else {
            url += '?' + paramsString;
        }
    }

    if (typeof formDataParams !== 'undefined') {

        var formData = new FormData();
        for (var paramName in formDataParams) {
            formData.append(paramName, formDataParams[paramName]);
        }
    }

    var xhr = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');

    xhr.onreadystatechange = function () {
        if (xhr.readyState === 4) {
            if (xhr.status == 200) {

                var response = (originalResponse) ? xhr : xhr.responseText;

                if (xmlResponse) {

                    response = xhr.responseXML;
                } else if (jsonResponse) {
                    response = JSON.parse(response);
                }

                if (onSuccess) {
                    onSuccess(response);
                }
            } else {
                if (onError) {
                    onError();
                }
            }
        }
    };

    if (credentials) {
        xhr.withCredentials = true;
    }

    if (url) {
        xhr.open(method, url, asynchronous);
        try {
            xhr.send(formData);
        } catch (e) {
            if (onError) {
                onError();
            }
        }
    }
};