ddd-jquery/ajax/xhr.js

de-bowerified, de-amdified, de-gruntified... jQuery.

var jQuery = require('../core'), support = require('../var/support'), __unnameddep__ = require('../ajax');
jQuery.ajaxSettings.xhr = function () {
    try {
        return new XMLHttpRequest();
    } catch (e) {
    }
};
var xhrId = 0, xhrCallbacks = {}, xhrSuccessStatus = {
        0: 200,
        1223: 204
    }, xhrSupported = jQuery.ajaxSettings.xhr();
if (window.ActiveXObject) {
    jQuery(window).on('unload', function () {
        for (var key in xhrCallbacks) {
            xhrCallbacks[key]();
        }
    });
}
support.cors = !!xhrSupported && 'withCredentials' in xhrSupported;
support.ajax = xhrSupported = !!xhrSupported;
jQuery.ajaxTransport(function (options) {
    var callback;
    if (support.cors || xhrSupported && !options.crossDomain) {
        return {
            send: function (headers, complete) {
                var i, xhr = options.xhr(), id = ++xhrId;
                xhr.open(options.type, options.url, options.async, options.username, options.password);
                if (options.xhrFields) {
                    for (i in options.xhrFields) {
                        xhr[i] = options.xhrFields[i];
                    }
                }
                if (options.mimeType && xhr.overrideMimeType) {
                    xhr.overrideMimeType(options.mimeType);
                }
                if (!options.crossDomain && !headers['X-Requested-With']) {
                    headers['X-Requested-With'] = 'XMLHttpRequest';
                }
                for (i in headers) {
                    xhr.setRequestHeader(i, headers[i]);
                }
                callback = function (type) {
                    return function () {
                        if (callback) {
                            delete xhrCallbacks[id];
                            callback = xhr.onload = xhr.onerror = null;
                            if (type === 'abort') {
                                xhr.abort();
                            } else if (type === 'error') {
                                complete(xhr.status, xhr.statusText);
                            } else {
                                complete(xhrSuccessStatus[xhr.status] || xhr.status, xhr.statusText, typeof xhr.responseText === 'string' ? { text: xhr.responseText } : undefined, xhr.getAllResponseHeaders());
                            }
                        }
                    };
                };
                xhr.onload = callback();
                xhr.onerror = callback('error');
                callback = xhrCallbacks[id] = callback('abort');
                xhr.send(options.hasContent && options.data || null);
            },
            abort: function () {
                if (callback) {
                    callback();
                }
            }
        };
    }
});