Скачать или смотреть How to Fix Scroll Restoration Issues in Angular 10 When Using the Back Button

Learn how to handle scroll restoration effectively in Angular 10 when users press the browser back button, ensuring a smooth user experience.
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Fixing Scroll Restoration Issues in Angular 10 on Back Button Press

When building web applications with Angular, users often encounter issues with scroll restoration, especially when using the back button on their browser. This can be particularly frustrating when users revisit a page and find themselves in the wrong scroll location. This guide will outline a common problem developers face with Angular 10 scroll restoration and provide a solution based on real-world experience.

Understanding the Problem

The primary issue being faced is related to the asynchronous loading of data. When users navigate back to a previous page, the scroll position may not reflect where they left off, primarily due to the time it takes to load necessary data. The symptoms of this problem include:

Inconsistent scroll positions when going back to a previous route.

Users experiencing partial scrolling before data is fully loaded.

The developer in this scenario observed that while using a fixed height for the container div improved behavior, it wasn't a feasible long-term solution.

Diving Into the Solution

To address the problem effectively, the developer proposed storing the scroll position using Angular lifecycle hooks. Here's a breakdown of the proposed solution:

Step 1: Store the Scroll Position

A simple yet effective method is to store the current scroll position when the component is destroyed. This can be achieved using Angular's ngOnDestroy lifecycle hook:

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

Here, the scroll position is captured and stored into a service, which allows it to be accessed later.

Step 2: Restore the Scroll Position

Once the scroll position has been saved, the next step is to restore it appropriately when navigating back:

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This method is executed in the subscription to ensure it runs after new data has been emitted.

Step 3: Implementing the Restore Logic

The restoreScrollPosition method can use a timeout to ensure the browser has had enough time to load all elements before scrolling:

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

This method uses a timeout function to delay the scroll restoration, giving time for the content to load before scrolling to the previously stored position.

Conclusion

By implementing this multi-step solution, developers can enhance user experience significantly by ensuring that the scroll restoration works as intended when navigating with the browser’s back button. This approach not only takes into account Angular’s inherent handling of asynchronous data but also offers a practical workaround that can be applied in various scenarios.

Key Takeaways:

Use ngOnDestroy to capture the scroll position before a component is destroyed.

Implement a restoreScrollPosition method that handles the re-positioning of the scroll after data has loaded.

Use timeouts strategically to ensure that the desired DOM elements are rendered before executing scroll actions.

By following these guidelines, you'll be well-equipped to tackle scroll restoration issues in Angular applications with ease.