Скачать или смотреть Resolving the routerLinkActive Issue with Reactive Forms in Angular

Learn how to fix the issue with `routerLinkActive` not working when using `formControlName` in Angular's reactive forms. Follow our guide for a quick resolution!
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This video is based on the question https://stackoverflow.com/q/70609926/ asked by the user 'BlueTree' ( https://stackoverflow.com/u/5201748/ ) and on the answer https://stackoverflow.com/a/70610857/ provided by the user 'Juan Vicente Berzosa Tejero' ( https://stackoverflow.com/u/15468663/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the routerLinkActive Issue in Angular

When developing applications with Angular, creating a seamless user interface often requires leveraging features like routerLink and routerLinkActive. However, developers can sometimes face challenges when these elements don’t behave as expected. One common issue arises when using formControlName in conjunction with routerLinkActive, causing the active state not to update until the user interacts twice. Let's break down this challenge and walk through a solution.

The Problem: routerLinkActive Not Responding

A user reported an issue while working on a vertical navigation bar for navigating between different components. Here’s a closer look at the symptoms they encountered:

Upon clicking a navigation item, the item failed to mark itself as active on the first click.

The user needed to click again after navigating to see the active state reflected.

Key Observation: The issue occurred when formControlName was added to the form. Removing it restored the expected behavior, indicating that something about using reactive forms was interfering with routerLinkActive.

Proposed Solution: Setting Up Reactive Forms Correctly

The crux of the problem lies in ensuring that your Angular component is properly set up to use reactive forms. Here's how to sort it out step by step:

Step 1: Define a FormGroup

Create a FormGroup: You need to declare a FormGroup in your component where you intend to use formControlName. This binds the form controls to the component’s logic and state management.

Here’s an example for profile-details.component.ts:

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

Step 2: Update the Template

Bind the FormGroup: In your HTML, ensure that your form specifies the FormGroup using Angular's binding syntax. Here’s how the updated profile-details.component.html would look:

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

Step 3: Import ReactiveFormsModule

Ensure Proper Module Imports: To utilize reactive forms in Angular, you need to import ReactiveFormsModule in your app module. Open your app.module.ts and add this import:

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

Final Thoughts

By defining a FormGroup in your Angular component and ensuring that you properly bind it in your template, you should find that the routerLinkActive behaves as expected when navigating through your application. This approach minimizes the need for double-clicking and enhances the user experience.

Now, with this guide in hand, you're equipped to tackle the routerLinkActive issue when using reactive forms in Angular. Happy coding!