Can AngularJS auto-update a view if a persistent model (server database) is changed by an external app?

Question

I\'m just starting to familiarize with AngularJS, but I would like to build a web app that has a view that gets auto-upated in real-time (no refresh) for the user when somet

Answer 1

Here's an implementation that uses jetty instead node. The angularjs part is based on the angular-seed app. I'm not sure if the angular code is idiomatic...but I've tested that this works. HTH -Todd.

TimerWebSocketServlet see

https://gist.github.com/3047812

controllers.js

// -------------------------------------------------------------
// TimerCtrl
// -------------------------------------------------------------
function TimerCtrl($scope, CurrentTime) {
    $scope.CurrentTime = CurrentTime;
    $scope.CurrentTime.setOnMessageCB(
        function (m) {
            console.log("message invoked in CurrentTimeCB: " + m);
            console.log(m);
            $scope.$apply(function(){
                $scope.currentTime = m.data;
            })
        });
}
TimerCtrl.$inject = ['$scope', 'CurrentTime'];

services.js

angular.module('TimerService', [], function ($provide) {
    $provide.factory('CurrentTime', function () {
        var onOpenCB, onCloseCB, onMessageCB;
        var location = "ws://localhost:8888/api/timer"
        var ws = new WebSocket(location);
        ws.onopen = function () {
            if(onOpenCB !== undefined)
            {
                onOpenCB();
            }
        };
        ws.onclose = function () {
            if(onCloseCB !== undefined)
            {
                onCloseCB();
            }
        };
        ws.onmessage = function (m) {
            console.log(m);
            onMessageCB(m);
        };

        return{
            setOnOpenCB: function(cb){
               onOpenCB = cb;
            },
            setOnCloseCB: function(cb){
                onCloseCB = cb;
            },
            setOnMessageCB: function(cb){
                onMessageCB = cb;
            }
        };
    })});

web.xml

    TimerServlet
    TimerWebSocketServlet
    0


    TimerServlet
    /api/timer/*