Angularjs scope's parent id

Question

Angularjs scope's parent id

I'm looking to access or manipulate a scope's grandparent without making things overly complicated. Leveraging the controller as syntax, I can reference the parent controller like so: this.applicationCtrl.something with applicationCtrl > parent1Ctrl > child1Ctrl - siblingOfChild1Ctrl hierarchy.

For example, picture an applicationCtrl on the <body> tag, alongside a side panel managed by sidePanelCtrl and content controlled by contentCtrl which has a nested contentChildCtrl

Utilizing the controller as model, it's easy to interact with the sidePanelCtrl using this.sidePanelCtrl. But what if I want to stick to using the $scope?

This question arises when dealing specifically with contentChildCtrl where directly accessing $scope.$parent.$parent will only lead me back to the applicationCtrl, skipping over the sidePanelCtrl.

javascript angularjs

Answer 1

Answer №1

If you are unsure of the nesting level of the parent scope or prefer not to repeatedly type $scope.$parent.$parent, you can create a service like this:

angular.module('app').service('inherit', function () {
  var inherit = function(scope, item) 
    if (!scope) return;
    if (scope[item]) return scope[item];
    return inherit(scope.$parent, item);
  }
  return inherit;
}

If your namespacing is not clear, this method may not be very helpful. However, if you need to make changes to, for example, the sidebar content from a scope that is multiple levels deep, you can use

var sidebarNav = inherit($scope, 'sidebarNav');

in the corresponding controller.

Updated - It is recommended to place this functionality in a service rather than directly on $rootScope, as mentioned in the comment below.

Update: Refactored to utilize a service

Answer 2

If you are unsure of the nesting level of the parent scope or prefer not to repeatedly type $scope.$parent.$parent, you can create a service like this:

angular.module('app').service('inherit', function () {
  var inherit = function(scope, item) 
    if (!scope) return;
    if (scope[item]) return scope[item];
    return inherit(scope.$parent, item);
  }
  return inherit;
}

If your namespacing is not clear, this method may not be very helpful. However, if you need to make changes to, for example, the sidebar content from a scope that is multiple levels deep, you can use

var sidebarNav = inherit($scope, 'sidebarNav');

in the corresponding controller.

Updated - It is recommended to place this functionality in a service rather than directly on $rootScope, as mentioned in the comment below.

Update: Refactored to utilize a service

Angularjs scope's parent id

Answer №1

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