angularjs make a simple countdown

I would like make a countDown with Angular js. this is my code:

Html File

<div ng-app ng-controller = "countController"> {{countDown}} <div>

js File

function countController($scope){
    $scope.countDown = 10;    
    var timer = setInterval(function(){$scope.countDown--; console.log($scope.countDown)},1000);  
}

in console.log it works I have a countdown but in {{countdown}} refresh it doesn't could you help me please? thanks!

Solution 1:

Please take a look at this example here. It is a simple example of a count up! Which I think you could easily modify to create a count down.

http://jsfiddle.net/ganarajpr/LQGE2/

JavaScript code:

function AlbumCtrl($scope,$timeout) {
    $scope.counter = 0;
    $scope.onTimeout = function(){
        $scope.counter++;
        mytimeout = $timeout($scope.onTimeout,1000);
    }
    var mytimeout = $timeout($scope.onTimeout,1000);

    $scope.stop = function(){
        $timeout.cancel(mytimeout);
    }
}

HTML markup:

<!doctype html>
<html ng-app>
<head>
    <script src="http://code.angularjs.org/angular-1.0.0rc11.min.js"></script>
    <script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
</head>
<body>
<div ng-controller="AlbumCtrl">
    {{counter}}
    <button ng-click="stop()">Stop</button>    
</div>
</body>
</html>

Solution 2:

As of version 1.3 there's a service in module ng: $interval

function countController($scope, $interval){
    $scope.countDown = 10;    
    $interval(function(){console.log($scope.countDown--)},1000,0);
}

Use with caution:

Note: Intervals created by this service must be explicitly destroyed when you are finished with them. In particular they are not automatically destroyed when a controller's scope or a directive's element are destroyed. You should take this into consideration and make sure to always cancel the interval at the appropriate moment. See the example below for more details on how and when to do this.

From: Angular's official documentation.

Solution 3:

You should use $scope.$apply() when you execute an angular expression from outside of the angular framework.

function countController($scope){
    $scope.countDown = 10;    
    var timer = setInterval(function(){
        $scope.countDown--;
        $scope.$apply();
        console.log($scope.countDown);
    }, 1000);  
}

http://jsfiddle.net/andreev_artem/48Fm2/

Solution 4:

I updated Mr. ganaraj answer to show stop and resume functionality and added angular js filter to format countdown timer

it is here on jsFiddle

controller code

'use strict';
var myApp = angular.module('myApp', []);
myApp.controller('AlbumCtrl', function($scope,$timeout) {
    $scope.counter = 0;
    $scope.stopped = false;
    $scope.buttonText='Stop';
    $scope.onTimeout = function(){
        $scope.counter++;
        mytimeout = $timeout($scope.onTimeout,1000);
    }
    var mytimeout = $timeout($scope.onTimeout,1000);
    $scope.takeAction = function(){
        if(!$scope.stopped){
            $timeout.cancel(mytimeout);
            $scope.buttonText='Resume';
        }
        else
        {
            mytimeout = $timeout($scope.onTimeout,1000);
            $scope.buttonText='Stop';
        }
            $scope.stopped=!$scope.stopped;
    }   
});

filter-code adapted from RobG from stackoverflow

myApp.filter('formatTimer', function() {
  return function(input)
    {
        function z(n) {return (n<10? '0' : '') + n;}
        var seconds = input % 60;
        var minutes = Math.floor(input / 60);
        var hours = Math.floor(minutes / 60);
        return (z(hours) +':'+z(minutes)+':'+z(seconds));
    };
});

Solution 5:

It might help to "How to write the code for countdown watch in AngularJS"

Step 1 : HTML Code-sample

<div ng-app ng-controller="ExampleCtrl">
    <div ng-show="countDown_text > 0">Your password is expired in 180 Seconds.</div>
    <div ng-show="countDown_text > 0">Seconds left {{countDown_text}}</div>
    <div ng-show="countDown_text == 0">Your password is expired!.</div>
</div>

Step 2 : The AngulaJs code-sample

function ExampleCtrl($scope, $timeout) {
  var countDowner, countDown = 10;
  countDowner = function() {
    if (countDown < 0) {
      $("#warning").fadeOut(2000);
      countDown = 0;
      return; // quit
    } else {
      $scope.countDown_text = countDown; // update scope
      countDown--; // -1
      $timeout(countDowner, 1000); // loop it again
    }
  };

  $scope.countDown_text = countDown;
  countDowner()
}

The full example over countdown watch in AngularJs as given below.

<!DOCTYPE html>
<html>

<head>
  <title>AngularJS Example - Single Timer Example</title>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js"></script>
  <script>
    function ExampleCtrl($scope, $timeout) {
      var countDowner, countDown = 10;
      countDowner = function() {
        if (countDown < 0) {
          $("#warning").fadeOut(2000);
          countDown = 0;
          return; // quit
        } else {
          $scope.countDown_text = countDown; // update scope
          countDown--; // -1
          $timeout(countDowner, 1000); // loop it again
        }
      };

      $scope.countDown_text = countDown;
      countDowner()
    }
  </script>
</head>

<body>
  <div ng-app ng-controller="ExampleCtrl">
    <div ng-show="countDown_text > 0">Your password is expired in 180 Seconds.</div>
    <div ng-show="countDown_text > 0">Seconds left {{countDown_text}}</div>
    <div ng-show="countDown_text == 0">Your password is expired!.</div>
  </div>
</body>

</html>