Скачать или смотреть How to Add and Remove Classes Dynamically in JavaScript with Multiple Divs

Learn how to efficiently manage CSS classes in multiple divs with JavaScript. In this guide, we break down the solution to dynamically add or remove classes based on user interactions.
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This video is based on the question https://stackoverflow.com/q/69996121/ asked by the user 'Anthony David' ( https://stackoverflow.com/u/17432349/ ) and on the answer https://stackoverflow.com/a/69996185/ provided by the user 'Barmar' ( https://stackoverflow.com/u/1491895/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Class Management with JavaScript

In the world of web development, dynamically updating the class of an element can enhance user experience significantly. However, managing classes effectively can sometimes pose challenges, especially when dealing with multiple elements on a page. This guide addresses a common scenario: adding and removing classes when clicking on multiple divs using JavaScript.

The Problem

Imagine you have two separate sections with labels, and your goal is to highlight the selected label by adding a class called selected when a user clicks on it. While doing so, you want to ensure that the previous selection is cleared within the same section. This can become tricky since the same class might be present in both divs, causing confusion in your JavaScript logic.

Here's the concern expressed clearly:

When the first section of labels is clicked, the class gets removed from both sections, rather than just the adjacent labels in the current clicked section.

The Initial Attempt

Starting with a snippet of JavaScript code provided to manage the click events and class switching looks something like this:

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

While this code would highlight labels, it also removes the selected class from other sections when another label is clicked, leading to undesirable behavior.

The Solution

To achieve the correct functionality, adjustments need to be made so that the class manipulations are localized to the current section of labels. Here’s how you can do it:

Identify the Container:

When a label is clicked, we need to determine which .top-nav container it belongs to.

Target Relevant Labels:

With the identified container, we can then only remove the class from its internal labels, leaving others untouched.

Here's the revised code to correctly manage the class:

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

Complete HTML and CSS Example

To see the magic in motion, here's the full setup with HTML and CSS:

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

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

Conclusion

By incorporating the localized approach for class adjustments, you can effectively manage user interactions across multiple segments of your web application. Using JavaScript in tandem with CSS allows for a seamless user experience while ensuring clarity and functionality in your coding practices.

Feel free to try out the code snippets provided and adapt them to your needs. Happy coding!