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Discover how to properly implement a class toggle in JavaScript without jQuery. Learn to cycle through elements seamlessly with our step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/66935064/ asked by the user 'Raging Vids' ( https://stackoverflow.com/u/15421759/ ) and on the answer https://stackoverflow.com/a/66935184/ provided by the user 'Unmitigated' ( https://stackoverflow.com/u/9513184/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering JavaScript: Making a Class Toggle Work Perfectly Without jQuery

If you've tried to implement a class toggle in JavaScript for a set of sibling elements but found the behavior isn't quite what you expected, you're not alone. A common issue arises when trying to manage which sibling element has an "active" class, resulting in multiple elements being active at the same time rather than cycling through them individually. In this guide, we'll break down this problem and provide a clear solution.

The Problem

The goal is to toggle an "active" class on sibling elements, changing it every 2 seconds. Here’s a typical example where we have three div elements, and we want only one to be highlighted at a time with the "active" class:

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Current Behavior: With the basic toggle function, the "active" class was applied to every sibling in sequence and removed from them sequentially, leading to undesired outcomes.

Expected Behavior: Only one element should have the "active" class at any given time, cycling back to the first element after the last sibling.

The Solution

To achieve the desired toggle behavior, we need to ensure that we remove the active class from any currently active sibling before adding it to the next one. Here’s how to implement that step-by-step:

Step 1: HTML Structure

Start with a basic HTML structure like this:

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Step 2: CSS for Visibility

Define some basic styles for your boxes and the active class to differentiate them visually:

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Step 3: JavaScript Logic

Next, update your JavaScript to correctly toggle the "active" class. Here’s the revised code:

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Step 4: Putting It All Together

Here’s how your complete code will look when you put it all together:

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Conclusion

By following this guide, you can effortlessly manage the class toggling of sibling elements with JavaScript alone, enhancing the interactivity of your web applications. This methodology ensures that only one element has the "active" class at a time, creating a polished and professional-looking interface. Happy coding!