Sharing data between controllers in angular 1.5 components for effective communication

I have recently delved into the world of Angular and TypeScript.

The project is utilizing Typescript, Angular 1.5 components, with the goal to avoid using $scope if possible

One of the components features search input fields, while another component is responsible for rendering the returned value from a service.

Many resources online suggest using a service for data sharing between controllers or components. However, these solutions don't quite align with my specific scenario. It seems like it's either sticking to pure Angular methods, resorting back to $scope, or disregarding TypeScript altogether.

Current progress: When attempting to pass a variable through a service, it seems to only appear within the controller of the first component. The second component's controller does not receive the data, even though the parameter being passed (via constructor) remains empty.

Refer to the comments below for an example of the code structure.

angularjstypescriptangular-controllerangular-components

Answer №1

One way to connect variables from your controller to components is by using binding.

For instance: You can define a two-way binding named searchModel on each component. In this case, if you have components <comp-a> and <comp-b>, along with the controller $ctrl in the view where these components are used, you can implement it like this:

<div>
    <!-- $ctrl represents the view's controller -->
    <comp-a search-model="$ctrl.search"></comp-a>
    <comp-b search-model="$ctrl.search"></comp-b>
</div>

By connecting both components to the same model in the view controller, any changes made to one component (e.g., comp-a as the "search" component) will automatically reflect in the other component as well.

This approach is particularly beneficial when dealing with multiple instances of the components since you can link each pair of components using a different model variable in the view controller.

<div>
    <!-- $ctrl represents the view's controller -->
    <comp-a search-model="$ctrl.search"></comp-a>
    <comp-b search-model="$ctrl.search"></comp-b>

    <!-- changes in $ctrl.search2 will not affect comp-b above, only the ones below -->
    <comp-a search-model="$ctrl.search2"></comp-a>
    <comp-b search-model="$ctrl.search2"></comp-b>
</div>

Answer №2

Utilize angular events to establish communication between controllers asynchronously. Register your listener controller with $scope.$on('inputChanges'), and when the input changes (using $watch or ng-change directive), trigger the event with either $rootScope.$broadcast or $scope.$emit (choose based on parent/child controller structure, refer to Angular docs for details here$rootScope.Scope).

Regarding usage of $scope, Angular now recommends using ControllerAs syntax, but there is no issue with using $scope. Just ensure to implement one time binding properly to eliminate unnecessary watchers and remember to inject it in your controller and constructor using $inject.

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