How can I cancel or reset a timeInterval in AngularJS?

Question

How can I cancel or reset a timeInterval in AngularJS?

In my project demo, I have implemented a feature that fetches data from the server at regular intervals using $interval. Now, I am looking for a way to stop or cancel this process. Can you guide me on how to achieve this? And if I need to restart the process, what is the best approach?

Additionally, I have another query: while fetching data from the server periodically, do I need to use $scope.apply or $scope.watch? Your insights on this will be highly appreciated.

Check out my plunker below:

  app.controller('departureContrl',function($scope,test, $interval){
   setData();

   $interval(setData, 1000*30);

   function setData(){
      $scope.loading=true;
    test.stationDashBoard(function(data){
        console.log(data);
        $scope.data=data.data;
        $scope.loading=false;
        //alert(data);
    },function(error){
        alert('error')
    }) ;

   }
});

http://plnkr.co/edit/ly43m5?p=preview

javascript angularjs angularjs-scope

Answer 1

Answer №1

To efficiently manage intervals in AngularJS, you can save the promise returned by the interval function and later use $interval.cancel() to stop it when needed. By creating separate functions like start() and stop(), you can control the initiation and termination of intervals based on specific events. Below is a simple example illustrating how to start and stop an interval using event triggers (e.g., ng-click) in both the view and controller.

angular.module('app', [])

  .controller('ItemController', function($scope, $interval) {
  
    // store the interval promise in this variable
    var promise;
  
    // simulated items array
    $scope.items = [];
    
    // function to start the interval
    $scope.start = function() {
      // stop any existing interval before starting a new one
      $scope.stop(); 
      
      // save the interval promise
      promise = $interval(setRandomizedCollection, 1000);
    };
  
    // function to stop the interval
    $scope.stop = function() {
      $interval.cancel(promise);
    };
  
    // start the interval by default
    $scope.start();
 
    // stop the interval when the scope is destroyed
    $scope.$on('$destroy', function() {
      $scope.stop();
    });
            
    function setRandomizedCollection() {
      // generate random items from 1 to 11
      var randomItems = parseInt(Math.random() * 10 + 1); 
        
      // clear the items array
      $scope.items.length = 0; 
      
      // add random numbers to the items array
      while(randomItems--) {
        $scope.items.push(parseInt(Math.random() * 10000 + 1)); 
      }
    }
  
  });

<div ng-app="app" ng-controller="ItemController">
  
  <!-- Button to start the interval -->
  <button type="button" ng-click="start()">Start Interval</button>
  
  <!-- Button to stop the interval -->
  <button type="button" ng-click="stop()">Stop Interval</button>
  
  <!-- Display random items -->
  <ul>
    <li ng-repeat="item in items track by $index" ng-bind="item"></li>
  </ul>
  <!-- end of display -->
</div>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

Answer 2

To efficiently manage intervals in AngularJS, you can save the promise returned by the interval function and later use $interval.cancel() to stop it when needed. By creating separate functions like start() and stop(), you can control the initiation and termination of intervals based on specific events. Below is a simple example illustrating how to start and stop an interval using event triggers (e.g., ng-click) in both the view and controller.

angular.module('app', [])

  .controller('ItemController', function($scope, $interval) {
  
    // store the interval promise in this variable
    var promise;
  
    // simulated items array
    $scope.items = [];
    
    // function to start the interval
    $scope.start = function() {
      // stop any existing interval before starting a new one
      $scope.stop(); 
      
      // save the interval promise
      promise = $interval(setRandomizedCollection, 1000);
    };
  
    // function to stop the interval
    $scope.stop = function() {
      $interval.cancel(promise);
    };
  
    // start the interval by default
    $scope.start();
 
    // stop the interval when the scope is destroyed
    $scope.$on('$destroy', function() {
      $scope.stop();
    });
            
    function setRandomizedCollection() {
      // generate random items from 1 to 11
      var randomItems = parseInt(Math.random() * 10 + 1); 
        
      // clear the items array
      $scope.items.length = 0; 
      
      // add random numbers to the items array
      while(randomItems--) {
        $scope.items.push(parseInt(Math.random() * 10000 + 1)); 
      }
    }
  
  });

<div ng-app="app" ng-controller="ItemController">
  
  <!-- Button to start the interval -->
  <button type="button" ng-click="start()">Start Interval</button>
  
  <!-- Button to stop the interval -->
  <button type="button" ng-click="stop()">Stop Interval</button>
  
  <!-- Display random items -->
  <ul>
    <li ng-repeat="item in items track by $index" ng-bind="item"></li>
  </ul>
  <!-- end of display -->
</div>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

Answer 3

Answer №2

let timer = setInterval(function() {
  console.log('greet');
}, 1000);

clearInterval(timer);

Answer 4

let timer = setInterval(function() {
  console.log('greet');
}, 1000);

clearInterval(timer);

Answer 5

Answer №3

let countdown = $interval(function(){
    if($location.path() === '/start'){
        $rootScope.$emit('newData',"example");
        $interval.cancel(countdown);
    }
},1500);

Answer 6

let countdown = $interval(function(){
    if($location.path() === '/start'){
        $rootScope.$emit('newData',"example");
        $interval.cancel(countdown);
    }
},1500);

Answer 7

Answer №4

If you're looking to set up an interval storage promise in a variable, follow these steps:

const intervalPromise = $interval(function() { ... }, 1000);

To stop or clear the interval, all you need to do is this:

$interval.cancel(intervalPromise);

Answer 8

If you're looking to set up an interval storage promise in a variable, follow these steps:

const intervalPromise = $interval(function() { ... }, 1000);

To stop or clear the interval, all you need to do is this:

$interval.cancel(intervalPromise);

Answer 9

Answer №5

    $scope.controlSideBarDelayed = function(){
        var timer = $interval(function(){
            $scope.toggleSidebar();
        },1000,1)
        .then(function(){
            $interval.cancel(timer);
        });
    };

Answer 10

    $scope.controlSideBarDelayed = function(){
        var timer = $interval(function(){
            $scope.toggleSidebar();
        },1000,1)
        .then(function(){
            $interval.cancel(timer);
        });
    };

How can I cancel or reset a timeInterval in AngularJS?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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