Issue arising from AngularJS whereby child controller data fails to load on the user interface when utilizing the $emit function to refresh

Question

Issue arising from AngularJS whereby child controller data fails to load on the user interface when utilizing the $emit function to refresh

Utilizing AngularJS 1.5 and utilizing ‘$emit’ to dispatch an event to the parent controller in order to refresh the data. I have included logic in the ‘$On’ function to update the parent controller data.

However, after updating the Parent controller data successfully, it seems that the child controller, where ‘$emit’ was triggered from, is unable to bind the updated data.

I've attempted using ‘$apply’, but it throws an error mentioning that the ‘$digest’ process is already ongoing. I even used Batrang tool to inspect the data and found that all necessary data exist on the page, yet they are not reflecting on the UI.

Is there a way to force Angular to properly bind this data with the HTML controls that are currently present on the page?

I'm unable to provide sample code since this issue is occurring within a live project and recreating it would require setting up a separate sample project. If providing a solution without seeing the code is challenging, I can create a Plunker tomorrow to demonstrate the problem.

javascript angularjs emit ng-controller

Answer 1

Answer №1

According to the Angular documentation, there are two approaches for declaring a controller in HTML:

The first method involves binding methods and properties directly onto the controller using
ng-controller="SettingsController1 as settings"
.

The second method entails injecting $scope into the controller with
ng-controller="SettingsController2"
.

The latter option is more commonly used within the Angular community, especially in boilerplates and guides. However, there are benefits to binding properties directly to the controller and steering clear of scope.

Utilizing controller as clearly indicates which controller you are accessing in the template when multiple controllers are applied to an element. If your controllers are written as classes, you have easier access to the properties and methods that will be visible on the scope from inside the controller code. The bindings always include a ., eliminating concerns about prototypal inheritance masking primitives.

Hence, it is possible to reference the parent scope in the child scope by employing controller as:

<div ng-controller="parentController as parent">
    <span>{{parent.title}}</span>
    <div ng-controller="childController as child">
        <span>{{parent.title}}</span>
        <span>{{child.title}}</span>
    </div>
</div>

Answer 2

According to the Angular documentation, there are two approaches for declaring a controller in HTML:

The first method involves binding methods and properties directly onto the controller using
ng-controller="SettingsController1 as settings"
.

The second method entails injecting $scope into the controller with
ng-controller="SettingsController2"
.

The latter option is more commonly used within the Angular community, especially in boilerplates and guides. However, there are benefits to binding properties directly to the controller and steering clear of scope.

Utilizing controller as clearly indicates which controller you are accessing in the template when multiple controllers are applied to an element. If your controllers are written as classes, you have easier access to the properties and methods that will be visible on the scope from inside the controller code. The bindings always include a ., eliminating concerns about prototypal inheritance masking primitives.

Hence, it is possible to reference the parent scope in the child scope by employing controller as:

<div ng-controller="parentController as parent">
    <span>{{parent.title}}</span>
    <div ng-controller="childController as child">
        <span>{{parent.title}}</span>
        <span>{{child.title}}</span>
    </div>
</div>

Issue arising from AngularJS whereby child controller data fails to load on the user interface when utilizing the $emit function to refresh

Answer №1

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