| 'use strict'; |
| |
| var inherits = require('inherits') |
| , AjaxBasedTransport = require('./lib/ajax-based') |
| , XhrReceiver = require('./receiver/xhr') |
| , XHRCorsObject = require('./sender/xhr-cors') |
| , XHRLocalObject = require('./sender/xhr-local') |
| , browser = require('../utils/browser') |
| ; |
| |
| function XhrStreamingTransport(transUrl) { |
| if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) { |
| throw new Error('Transport created when disabled'); |
| } |
| AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XHRCorsObject); |
| } |
| |
| inherits(XhrStreamingTransport, AjaxBasedTransport); |
| |
| XhrStreamingTransport.enabled = function(info) { |
| if (info.nullOrigin) { |
| return false; |
| } |
| // Opera doesn't support xhr-streaming #60 |
| // But it might be able to #92 |
| if (browser.isOpera()) { |
| return false; |
| } |
| |
| return XHRCorsObject.enabled; |
| }; |
| |
| XhrStreamingTransport.transportName = 'xhr-streaming'; |
| XhrStreamingTransport.roundTrips = 2; // preflight, ajax |
| |
| // Safari gets confused when a streaming ajax request is started |
| // before onload. This causes the load indicator to spin indefinetely. |
| // Only require body when used in a browser |
| XhrStreamingTransport.needBody = !!global.document; |
| |
| module.exports = XhrStreamingTransport; |