Скачать или смотреть Solving the Custom Angular Notification Message Display Problem with setTimeout()

Discover how to effectively display custom notifications in Angular using setTimeout() without the flickering issue. Follow our step-by-step guide for a robust solution!
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This video is based on the question https://stackoverflow.com/q/70102027/ asked by the user 'Victoria' ( https://stackoverflow.com/u/10466075/ ) and on the answer https://stackoverflow.com/a/70107345/ provided by the user 'DSMSTHN' ( https://stackoverflow.com/u/17503889/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Custom Angular Notification Message Display Problem with setTimeout()

In Angular applications, handling notifications effectively is crucial for providing a seamless user experience. However, developers can often run into issues regarding the display and duration of these notifications, primarily when using features like setTimeout(). This guide dives into resolving a common problem: ensuring that notifications remain visible for a specified duration, even when triggered multiple times, without flickering or disappearing unexpectedly.

The Problem at Hand

Imagine you have a button in your Angular application that, when clicked, displays a notification message. You want this message to remain on the screen for at least two seconds. However, when this button is clicked multiple times, the notification may disappear too quickly, often flashing on the screen instead of remaining visible for the desired duration. This can confuse users and diminish the effectiveness of notifications, leading to frustration.

User Feedback

A user named Victoria encountered this issue while working with the following code snippet:

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

Her notification popup seemed to misbehave when clicked repeatedly, leading her to seek help. We can assist by analyzing the Angular TypeScript code that handles these notifications.

Analyzing the Code

The provided TypeScript code for handling notifications looks like this:

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

Key Issues

Re-triggering the timeout: Each time a button is clicked, the timeout creates a new pending command to clear the success message. This leads to potential conflicts and unexpected behavior.

Flickering Notifications: If the user clicks the button repeatedly, the notifications may not stay on screen due to fast re-triggering and premature clearing.

The Solution

To resolve the identified issues, we'll modify the code so that previously queued timeouts are properly canceled, ensuring a consistent display of the notification for the desired duration.

Step-by-step Solution

Cache Timeout Reference: Introduce a variable to store the timeout ID. This will allow us to clear any previous timeouts before setting a new one.

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

Modify the Observable Handling: Update the handling of the successMessage$ to clear previous timeouts and set a new duration for displaying notifications.

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

Code Overview

This updated code ensures that:

If a notification message is already visible and the button is clicked again, the previous timeout is cleared.

The new notification is displayed for a full two seconds regardless of additional clicks during that time.

Conclusion

By implementing the suggested changes to how notifications are managed in your Angular application, you will create a more user-friendly experience. No longer will notifications flash or disappear unexpectedly upon multiple button clicks. Instead, they'll provide clear messages to users, enhancing the overall interactivity of the application.

Feel free to incorporate these insights into your Angular projects, and transform the way notifications are handled today!