What is the best way to create a "Hello, world!" for Comet using AngularJS?

Struggling to figure out how to create a simple Comet proof-of-concept in AngularJS that involves the client making repeated Ajax calls rather than using streaming JavaScript. I've searched everywhere but haven't found a solution yet.

Let's say I have a server-side CGI script:

#!/bin/bash
echo "Content-type: application/json"
echo ""
echo "'"Hello world at "`/bin/date`"'!'"'"

How can I create a basic AngularJS proof of concept that will query the server every second, taking into account network latency, and display a "Hello world!" message along with the server time?

Answer №1

The Plunkr

Check out the Plunkr here!

Here's the HTML code:

<!DOCTYPE html>
<html>

  <head>
    <script data-require="angular.js@*" data-semver="1.2.15" src="http://code.angularjs.org/1.2.15/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-app="myApp" ng-controller="MyCtrl">
    {{data.theDate}}
  </body>

</html>

And here's the JavaScript code:

angular.module("myApp", []).service("UpdatingService", function($http, $timeout){
  var service = {
    data:{},

    getData:function(){
      $http.get("someData.json").success(function(result){
        angular.copy(result, service.data)
        service.data.theDate+="    "+new Date();
      });
    }
  };

  cancelRefresh = $timeout(function myFunction() {
      service.getData();
      cancelRefresh = $timeout(myFunction, 1000);
  },1000);


  return service;
}).controller("MyCtrl", function($scope, UpdatingService){
  $scope.data = UpdatingService.data;
});

As shown above, create a service for handling requests and storing data. Then create a controller to utilize this service. The service uses AngularJS features like $http and $timeout to make AJAX requests and continuously poll the server for updates. To stop the timer, refer to the link below for more details.

More information on using setInterval in AngularJS factory

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