Using $watchGroup to monitor changes in an array and automatically updating it

Issue:

I am facing a challenge where I want to pass an array of variables into $watchGroup and iterate through the array to update the values of each element. However, the current approach I am using does not seem to be effective:

$scope.secondsElapsed = stopWatchService.secondsElapsed;
$scope.minutesElapsed = stopWatchService.minutesElapsed;
$scope.colon = stopWatchService.colon;

$scope.timers = ['stopWatchService.secondsElapsed', 'stopWatchService.minutesElapsed', 'stopWatchService.colon'];

$scope.$watchGroup([$scope.timers], function(newValues, oldValues, scope){
if (newValues && newValues !== oldValues){
for (var i=0; i<newValues.length; i++){
scope.timers[i] = newValues[i];
}
}
});

Currently, I'm using the following workaround:

$scope.$watchGroup(['stopWatchService.secondsElapsed', 'stopWatchService.minutesElapsed', 'stopWatchService.colon'], function(newValues, oldValues, scope){
scope.secondsElapsed = newValues[0];
scope.minutesElapsed = newValues[1];
scope.colon = newValues[2];
});

Any suggestions or alternative approaches to address this issue?

javascriptarraysangularjsdata-bindingwatch

Answer №2

Have you considered utilizing $watchGroup? It seems like that could be the solution to your issue. Make sure to pass an array as the first parameter.

Answer №3

Avoid placing $scope.timers inside an array because it is already an array by itself.

Use 

$scope.$watchGroup($scope.timers, ...)
rather than 
$scope.$watchGroup([$scope.timers], ...)

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