Using Angular UI Router to Access $scope Beyond the Scope of the UI View

Looking for a way to access $scope outside the UI view in my todo app. The structure is simple, with three panels as shown in this design

For the full code, visit here

I need to access the to-do detail on the third panel using $rootScope, which currently isn't the recommended method. Each of the three panels has its own controller and I'm changing the state of the UI router when clicking on a to-do item. I specifically require access to the to-do data in the third panel.

<!-- Routers -->

.state('dashboard', {
  url: '/dashboard',
  abstract: true,
  views: {
    '': {
      templateUrl: './partials/main.html'
    },
    'header_toolbar@dashboard': {
      templateUrl: './views/header_toolbar.html'
    },
    'sidenavleft@dashboard': {
      templateUrl: './views/sidenav.html'
    },    
    'todo_detail@dashboard': {
      templateUrl: './views/todo_detail.html'
    }
  }
})

... (omitted for brevity) ...

<!-- ----------------Controllers  --------------------- ->  

app.controller("ListController", ['$rootScope', '$scope', '$state', ... {
   ... (controller details)
}]);

app.controller("TodoDetailController", ['$rootScope', '$scope', '$state', ... {
   ... (controller details)
}]);
<!--  Main.html  -->
    
<div id="appContainer" md-theme="{{ dynamicTheme }}" ng-init="load()" md-theme-watch>
    <!-- Header Toolbar -->
    <div ui-view="header_toolbar"></div>
  
    <div layout="row" layout-xs="column" layout-sm="column">
        <!-- Sidenav right view -->
        <div ui-view="sidenavleft" id="nav_container"></div>
  
        <!-- Main middle container  -->
        <div flex="100" flex-gt-sm="55" layout="column" id="list_content">
            <md-content layout="column" flex class="md-padding">
                <div ui-view></div>
            </md-content>
        </div>
  
        <!-- Todo Detail View -->
        <div ui-view="todo_detail" id="todo_detail_view"></div>
    </div>
</div>

Avoiding data passing through $rootScope is a priority for me. Currently, the issue lies in the fact that when clicking on a to-do item, both the list and detail should remain visible. However, the middle template disappears upon clicking on a to-do item due to the placement of "Todo Detail View" outside the UI view.

The main challenge is needing to access data within "Todo Detail View".

Answer №1

When naming a variable $scope, its purpose becomes clear - it is meant to be scoped and not accessible from external sources. The $rootScope serves as a means of communication between closely connected child and parent elements.

In my opinion, the most common way to share data among different controllers is through angular services. These services can be injected into all controllers that need access to or manipulate the data: https://docs.angularjs.org/guide/services

For example, consider the following implementation:

app.service('todoService', function() {
    var myTodos = [];
    this.addTodo = function (todo) {
        myTodos.push(todo);
    }
    this.getAllTodos = function(filter) {
       return myTodos.filter(filter);
    }
});

app.controller('firstController', function($scope, todoService) {
    // utilize todoService.addTodo() and other methods
});

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