javascript - Using Node.js to retrieve data from Redis through an AJAX request -

i'm going through node, express, & socket.io chat tutorial. decided use redis store chat history , have set information correctly posting database. trying access information use on client-side (in case i'm trying access list of users in chat can show them side of chat). using $.getjson make get request. right have setup file tries access has json object : {"dog" : "2","cat":"3"} test it, , working, i'm not sure go there because anytime try adding function file, if specify return json object , call function, request stops returning correct information.

for example tried :

var data = function(){     return {"dog" : "2","cat":"3"} } data(); 

and doesn't return ( understand when make get request function isn't run, doesn't return text, , if doesn't run function i'm not sure how can access redis file)

here's i'm thinking:

var redis = require('redis')  //figure out how access redis client have @ localhost:6379, var db = redis.x  //and call (for example) db.smembers('onlineusers') , returned object can iterate through 

here's relevant code:

server.js:

var jade = require('jade'); var port = 8080;  var redis = require('redis'); var db = redis.createclient(); var pub = redis.createclient(); var sub = redis.createclient();  var http = require('http'); var express = require('express'); var app = express(); var server = http.createserver(app); var io = require('socket.io').listen(server); server.listen(port, function(){   console.log("now connected on localhost:" + port) });  app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.set("view options", {layout: false}); app.use(express.static(__dirname + '/public')); app.get('/', function(req, res){  res.render('home'); });  io.sockets.on('connection', function(client){    sub.subscribe("chatting");   sub.on("message", function (channel, message) {         console.log("message received on server publish");         client.send(message);     });    client.on("sendmessage", function(msg) {             pub.publish("chatting",msg);         });    client.on("setusername", function(user){             pub.publish("chatting","a new user in connected:" + user);             db.sadd("onlineusers",user);         }     );    client.on('disconnect', function () {         sub.quit();         pub.publish("chatting","user disconnected :" + client.id);     }); }); 

script.js:

$(document).ready( function(){     $client = io.connect();     initialize(); });   var setusername = function(){     var username = $("#usernameinput").val();     if (username)     {         var user = username;         $client.emit('setusername', username);         $('#chatcontrols').show();         $('#usernameinput').hide();         $('#usernameset').hide();         showcurrentusers();     } }  var showcurrentusers = function(){     $('#list_of_users').empty();      $.getjson('getusers.js', function(data){         (var = 0; < data.length; i++){             $('list_of_users').append("<li>"+data[i]+"</li>")         }     })  }  var sendmessage = function(){     var msg = $('#messageinput').val();     var username = $("#usernameinput").val();     if (msg)     {         var data = {msg: msg, user: username}         $client.emit('message', data);         addmessage(data);         $('#messageinput').val('');         // populate(username,msg);     } }   var addmessage = function(data) {     $("#chatentries").append('<div class="message"><p>' + data.user + ' : ' + data.msg + '</p></div>'); }   // var populate = function(username,msg) { //     var data ; // }  var initialize = function(){     $("#chatcontrols").hide();     $("#usernameset").on('click', setusername);     $("#submit").on('click',sendmessage);     showcurrentusers(); } 

and right getusers.js file has in is:

{"dog" : "2","cat":"3"}

it looks you're expecting call $.getjson load , execute javascript loads. doesn't work way. need make node endpoint (via route) renders json. node endpoint data manipulation / querying redis:

node:

in routes.js:

app.get('/chatdata', chatcontroller.getchatdata); 

in chatcontroller.js (manipulate, create data here)

exports.getchatdata = function (req, res) {    var data = function(){       return {"dog" : "2","cat":"3"}    };    res.json(data); }; 

front-end

$.getjson('getchatdata', function(data){     //... })