Communication between $timeout and $scope functions in AngularJS

I stumbled upon an interesting anomaly in AngularJS. Why do these sections exhibit different behaviors?

Working Timeout (alert after 8 seconds)

$scope.testfun = function(){
    alert(2);
}
$scope.activate = function(h,m,s){
    if(h != 0 || m != 0 || s != 0) $timeout($scope.testfun, 8000);
}

Non-Working Timeout (alert immediately)

$scope.testfun = function(){
    alert(2);
}
$scope.activate = function(h,m,s){
    if(h != 0 || m != 0 || s != 0) $timeout($scope.testfun(), 8000);
}

The distinction between $scope.testfun and $scope.testfun() is crucial.

Answer №1

To implement a timeout function, follow the example below:

$scope.customFunction = function() {
    console.log('Timeout has been reached');
}

$scope.triggerTimer = function(hours, minutes, seconds) {
    if (hours !== 0 || minutes !== 0 || seconds !== 0) {
        $timeout(function () {
            $scope.customFunction();
        }, 8000);
    }
}

Answer №2

When using $scope.function(), be cautious as it might not work properly.

$timeout(function() { $scope.testfun(someParam); }, 8000) 

The scope acts as the intermediary between the HTML (view) and the JavaScript (controller).

Within the scope are various properties and methods that can be accessed.

Both the view and the controller have access to the scope, making it a crucial component of AngularJS architecture.

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