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Скачать или смотреть Solving the ngIf Component Visibility Issue in Angular

  • vlogize
  • 2025-09-28
  • 1
Solving the ngIf Component Visibility Issue in Angular
Angular: hiding a component with *ngIf doesn't workjavascripthtmlangulartypescriptrxjs
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Описание к видео Solving the ngIf Component Visibility Issue in Angular

Discover how to effectively use Angular's *ngIf directive to manage component visibility with reactive programming techniques.
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This video is based on the question https://stackoverflow.com/q/63628641/ asked by the user 'Francis McClain' ( https://stackoverflow.com/u/14180583/ ) and on the answer https://stackoverflow.com/a/63629452/ provided by the user 'Shashank Vivek' ( https://stackoverflow.com/u/3092377/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Angular: hiding a component with *ngIf doesn't work

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Solving the ngIf Component Visibility Issue in Angular

Angular is a powerful framework for building dynamic web applications, but like any technology, it can come with its challenges, especially for beginners. One common issue that many new Angular developers face is ensuring that components show or hide correctly based on user interactions. In this post, we will explore a specific problem: *hiding a component using the ngIf directive that isn't working as expected. Let's dive into the issue and its resolution.

Understanding the Problem

When working with Angular, developers often want to toggle the visibility of components based on user actions. In this case, a user is attempting to dynamically show or hide a component (<app-csgo-course>) based on a boolean variable (show). The button in the navbar.component is responsible for toggling this variable, but changes are not reflecting in the course.component, which should display the component conditionally.

Here’s a quick overview of the code involved:

Navbar Component: Contains a button that toggles the show variable.

Course Component: Displays a component <app-csgo-course> based on the value of show using the *ngIf directive.

Course Service: Manages the show state and provides methods to toggle it.

Expected vs. Actual Behavior

Expected: When the button in the NavbarComponent is clicked, it should change the show variable, which in turn should show or hide <app-csgo-course> in the CourseComponent.

Actual: Clicking the button does toggle the variable, but the <app-csgo-course> component does not respond to the change.

The Solution: Implementing Reactive Programming

To achieve the desired functionality, we need to enhance the existing implementation by utilizing Reactive Programming principles offered by RxJS in Angular. This involves using a BehaviorSubject to track and notify changes in the show variable across components.

Step 1: Update the Course Service

Instead of using a simple boolean variable, we will implement a BehaviorSubject. This allows us to emit the current value of show and ensure subscribers get updates when it changes.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Modify the Navbar Component

Next, in the NavbarComponent, we will subscribe to the toggleEvent Observable. This allows us to update the local show variable whenever it changes.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Update the Course Component

Lastly, the CourseComponent also needs a similar adjustment. We will subscribe to toggleEvent as well to update its local show variable.

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

By implementing these changes, we enable reactive programming within our Angular application. The BehaviorSubject not only allows the NavbarComponent to update the show variable but also keeps the CourseComponent in sync seamlessly.

Important Note

Once you've grasped these concepts, it's essential to understand how to properly unsubscribe from Observables to avoid memory leaks in your applications. Research this topic further to ensure your Angular applications remain performant and manageable.

Happy coding! If you have any more questions or need further assistance, feel free to reach out.

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