controller.js

  angular.module('coursemate')
    .controller("chatCtrl", ['$rootScope','$scope', '$http', function($rootScope, $scope, $http){
        var vm = this;
        var socket = window.io('localhost:3030/');
        vm.newMessage = undefined;
        vm.username = undefined;
        vm.messages = [];
        vm.onlinelist = [];
        vm.sendBtnDisabled = true;
        vm.connected = false;


        //socket acions
        socket.on("receive-message", function(msg){
            //socket server send message to us
            $scope.$apply(function(){
              vm.messages.push(msg);
            });
        });

        socket.on("online-list", function(list){
            //server sends us refreshed list of members
            $scope.$apply(function(){
              vm.onlinelist = list;
            });
        });

        socket.on('disconnect', function(){
            //connection failed
            vm.connected = false;
            vm.keyEventSendMessage(null);
        });

        socket.on('connect', function(){
            //connection established
            vm.connected = true;
            vm.keyEventSendMessage(null);
        });
        vm.username = undefined;



        vm.sendMessage = function(){
            //we send messsage to socket server
            var newMessage = {
                username: vm.username,
                message: vm.newMessage
            };
            socket.emit("new-message", newMessage);

            var config = {
                headers : {
                    'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8;'
                }
            }
            var data = $.param({
                user: vm.username,
                content: vm.newMessage
            });
            $http.post('app/database/database.php?req=1', data, config).success(function(data) {
            });

            vm.newMessage = undefined;
            vm.keyEventSendMessage(null);
        };

        vm.createUser = function(username){
            // we "log in" as users
            vm.username = username;
            socket.emit("new-connection", username);
        }
        vm.keyEventSendMessage = function(event){
            //fired on keyhit at message input
            if(typeof(vm.newMessage) != 'undefined' && vm.newMessage != null && vm.newMessage != '' && vm.connected){
                vm.sendBtnDisabled = false;
                if(event != null && event.keyCode == 13){
                    vm.sendMessage();
                }
            }else{
                vm.sendBtnDisabled = true;
            }
        }

        $http.get('localhost:3030/api/feed').success(function(data) {
            console.log(data);
        });

    }]);