javascript - Express 4 Routes Using Socket.io -

having rough time adding socket.io in express 4 routes. in routes/index.js have:

var express = require('express'); var router = express.router();  /* home page. */ router.get('/', function (req, res, next) {   res.render('index', { title: 'express' }); });  router.post('/message', function(req, res) {   console.log("post request hit.");   // res.contenttype('text/xml');   console.log(appjs);   io.sockets.emit("display text", req);   // res.send('<response><sms>'+req.body+'</sms></response>'); });  module.exports = router; 

but io undefined. have seen several examples of how this, none worked me. appreciated.

you need pass socket.io variable router module has access. wrapping module in function call.

var express = require('express'); var router = express.router();  /* home page. */ var returnrouter = function(io) {     router.get('/', function(req, res, next) {         res.render('index', {             title: 'express'         });     });      router.post('/message', function(req, res) {         console.log("post request hit.");         // res.contenttype('text/xml');         console.log(appjs);         io.sockets.emit("display text", req);         // res.send('<response><sms>'+req.body+'</sms></response>');     });      return router; }  module.exports = returnrouter; 

then, whever import route call function like: require(./routefile)(io)

here's article creating modules require being passed variable: node.js, require , exports