Steps for assigning a $scope variable from within a different $scope variable

I am facing an issue with setting the value of a $scope variable after a promise (specifically, an $http request) is completed. Here's the code snippet in question:

.controller('NewItemCtrl', function ($scope, $state, LabelFactory) {

  $scope.createItem = function (item) {
    LabelFactory.createLabel(item)
      .then(function (response) {
        $scope.label = response.data;
        $scope.thing = 'These are things';
        $state.go('tab.newitem-label');
        console.log($scope.label);  
      });  
  };
})

From my understanding, this code should work as intended. However, although I can successfully log $scope.label, I cannot see the value when accessing it from the template associated with the NewItemCtrl controller. It seems like the value is not being passed at all, despite having been assigned.

I need guidance on either A. How to set the value of a $scope property from a different scope, or B. What is considered the best practice for achieving the same result?

Answer №1

The reason for this behavior is due to transitioning to a different state that recreates the scope object.

To address this, using a hierarchical state can be helpful. A child scope can access the parent state's scope. When moving to 'tab.newitem-label', if you are currently at the 'tab' state, simply setting the label in the scope of the tab state will allow you to access it from tab.newitem.

If you are utilizing ui-router, consider integrating the label into an existing state. You can access the parameterized value through $stateParams. Instead of directing to $state.go('tab.newitem-label');, pass your parameter to the new state like this:

$state.go('tab.newitem-label', {labelId: labelId});
Then, in your controller, retrieve the labelId parameter using $stateParams.labelId. Utilize the resolve feature of the state to fetch the label before initializing your controller. This way, you can inject the resolved data into your controller similar to injecting services.

Here is an example of defining such a state:

.state('tab.newitem-label', {
        url: '/:labelId',
        templateUrl: 'partials/yourpage.html',
        controller: 'NewStateCtrl'
        resolve: {
          label: ['labelService', '$stateParams', function (labelService, $stateParams) {
            return labelService.retrieveLabelFromLabelId($stateParams.labelId);
          }]
        }
      })

Answer №2

If you monitor the {$scope.label} closely with a watch, you can determine whether the update is successfully triggering the watch function. Once you verify that the update is indeed triggering the watch, utilize the function to update all instances/controllers where {$scope.label} is utilized, possibly utilizing $emit/$broadcast.

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