alter the appearance of a timepiece using a controller dynamically

Currently, I have a watch set up in my controller for the following watch:

var pageFunc = $scope.$watch('page["USER"].number', function(newob,oldob){
    console.log("WATCHING page");
    if(oldob != newob){
        //perform data load
    }
},true);

The collection that I am observing includes these elements:

 page["USER"].number = 20;
 page["TESTER"].number = 60;
 page["BORROWER"].number = 30;
 page["CLIENT"].number = 80;

I am looking to create a single watch that can track changes in all elements within this collection.

I attempted the following approach:

       $scope.$watch('page[" '+$scope.selectedType+'"].number', function(newob,oldob)

where $scope.selectedType is initialized inside ng-init. However, this method failed as the watch is triggered before ng-init runs. What would be the most effective way to accomplish this?

javascriptangularjsangularjs-scope

Answer №1

To monitor the changes, you can utilize a function callback:

$scope.$watch(function() {
  return page[$scope.selectedType].number;
}, function(newValue, oldValue) {
  if(oldValue != newValue) {
    // carry out an action
  }
});

Alternatively, if $scope.selectedType is distinct, you could directly watch it:

$scope.$watch('selectedType', function(newValue, oldValue) {
  if(oldValue != newValue) {
    // perform an operation
  }
});

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