aaac7fed
 liuqimichale
add
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'use strict';
var EventEmitter = require('events').EventEmitter
, inherits = require('inherits')
, JSON3 = require('json3')
, utils = require('./utils/event')
, IframeTransport = require('./transport/iframe')
, InfoReceiverIframe = require('./info-iframe-receiver')
;
var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
debug = require('debug')('sockjs-client:info-iframe');
}
function InfoIframe(baseUrl, url) {
var self = this;
EventEmitter.call(this);
var go = function() {
var ifr = self.ifr = new IframeTransport(InfoReceiverIframe.transportName, url, baseUrl);
ifr.once('message', function(msg) {
if (msg) {
var d;
try {
d = JSON3.parse(msg);
} catch (e) {
debug('bad json', msg);
self.emit('finish');
self.close();
return;
}
var info = d[0], rtt = d[1];
self.emit('finish', info, rtt);
}
self.close();
});
ifr.once('close', function() {
self.emit('finish');
self.close();
});
};
// TODO this seems the same as the 'needBody' from transports
if (!global.document.body) {
utils.attachEvent('load', go);
} else {
go();
}
}
inherits(InfoIframe, EventEmitter);
InfoIframe.enabled = function() {
return IframeTransport.enabled();
};
InfoIframe.prototype.close = function() {
if (this.ifr) {
this.ifr.close();
}
this.removeAllListeners();
this.ifr = null;
};
module.exports = InfoIframe;
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