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/**
* socket.io
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
(function (exports, io) {
/**
* Expose constructor.
*/
exports.htmlfile = HTMLFile;
/**
* The HTMLFile transport creates a `forever iframe` based transport
* for Internet Explorer. Regular forever iframe implementations will
* continuously trigger the browsers buzy indicators. If the forever iframe
* is created inside a `htmlfile` these indicators will not be trigged.
*
* @constructor
* @extends {io.Transport.XHR}
* @api public
*/
function HTMLFile (socket) {
io.Transport.XHR.apply(this, arguments);
};
/**
* Inherits from XHR transport.
*/
io.util.inherit(HTMLFile, io.Transport.XHR);
/**
* Transport name
*
* @api public
*/
HTMLFile.prototype.name = 'htmlfile';
/**
* Creates a new ActiveX `htmlfile` with a forever loading iframe
* that can be used to listen to messages. Inside the generated
* `htmlfile` a reference will be made to the HTMLFile transport.
*
* @api private
*/
HTMLFile.prototype.get = function () {
this.doc = new ActiveXObject('htmlfile');
this.doc.open();
this.doc.write('<html></html>');
this.doc.close();
this.doc.parentWindow.s = this;
var iframeC = this.doc.createElement('div');
iframeC.className = 'socketio';
this.doc.body.appendChild(iframeC);
this.iframe = this.doc.createElement('iframe');
iframeC.appendChild(this.iframe);
var self = this
, query = io.util.query(this.socket.options.query, 't='+ +new Date);
this.iframe.src = this.prepareUrl() + query;
io.util.on(window, 'unload', function () {
self.destroy();
});
};
/**
* The Socket.IO server will write script tags inside the forever
* iframe, this function will be used as callback for the incoming
* information.
*
* @param {String} data The message
* @param {document} doc Reference to the context
* @api private
*/
HTMLFile.prototype._ = function (data, doc) {
// unescape all forward slashes. see GH-1251
data = data.replace(/\\\//g, '/');
this.onData(data);
try {
var script = doc.getElementsByTagName('script')[0];
script.parentNode.removeChild(script);
} catch (e) { }
};
/**
* Destroy the established connection, iframe and `htmlfile`.
* And calls the `CollectGarbage` function of Internet Explorer
* to release the memory.
*
* @api private
*/
HTMLFile.prototype.destroy = function () {
if (this.iframe){
try {
this.iframe.src = 'about:blank';
} catch(e){}
this.doc = null;
this.iframe.parentNode.removeChild(this.iframe);
this.iframe = null;
CollectGarbage();
}
};
/**
* Disconnects the established connection.
*
* @returns {Transport} Chaining.
* @api public
*/
HTMLFile.prototype.close = function () {
this.destroy();
return io.Transport.XHR.prototype.close.call(this);
};
/**
* Checks if the browser supports this transport. The browser
* must have an `ActiveXObject` implementation.
*
* @return {Boolean}
* @api public
*/
HTMLFile.check = function (socket) {
if (typeof window != "undefined" && 'ActiveXObject' in window){
try {
var a = new ActiveXObject('htmlfile');
return a && io.Transport.XHR.check(socket);
} catch(e){}
}
return false;
};
/**
* Check if cross domain requests are supported.
*
* @returns {Boolean}
* @api public
*/
HTMLFile.xdomainCheck = function () {
// we can probably do handling for sub-domains, we should
// test that it's cross domain but a subdomain here
return false;
};
/**
* Add the transport to your public io.transports array.
*
* @api private
*/
io.transports.push('htmlfile');
})(
'undefined' != typeof io ? io.Transport : module.exports
, 'undefined' != typeof io ? io : module.parent.exports
);
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