How to Share Data Between AngularJS UI-Router States Without Services or Watchers?

Sharing $scope Data Between AngularJS UI-Router States without Services or Watchers

In UI-Router, it can be challenging to share data between the $scope of a main controller and its child states without relying on services or watchers in the parent controller.

Solution:

The key lies in understanding the relationship between AngularJS scopes and UI-Router views:

• Scope Inheritance by View Hierarchy Only: Scopes are inherited down the state chain only if the state views are nested.
• Understanding Scopes: Child scopes normally prototypically inherit from parent scopes. Using '.' notation (e.g., Model.PropertyName) ensures this inheritance.

Technical Implementation:

1. Define Nested Views: Ensure that child state views are nested within the parent view.
2. Use Reference Type Values: In your $scope model, use objects or references that are passed by reference, rather than primitive values.
3. Use Dot Notation: In your ng-model definitions, use dot notation to ensure prototypal inheritance (e.g., Model.PropertyName instead of PropertyName).

Example:

Consider the following UI-Router state definition:

.state("main", {
      controller:'mainController',
      url:"/main",
      templateUrl: "main_init.html"
  })  
  .state("main.1", {
      parent: 'main',
      controller:'mainController',
      url:"/1",
      templateUrl: 'form_1.html'
  })  
  .state("main.2", {
      parent: 'main',
      controller:'mainController',
      url: "/2",
      templateUrl: 'form_2.html'
  })  

Within the mainController, initialize the shared data model as follows:

controller('mainController', function ($scope) {
  $scope.Model = $scope.Model || {Name : "xxx"};
})

In your child state templates, use ng-model with dot notation to access the shared data:

<input type="text" ng-model="Model.Name">

By following these steps, you can effectively share data between $scopes in UI-Router states without the need for services or watchers in parent controllers.

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