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Learn why CSS styles may not apply when using jQuery to change classes and explore effective solutions to ensure your styles update correctly.
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This video is based on the question https://stackoverflow.com/q/65685058/ asked by the user 'Johnathan' ( https://stackoverflow.com/u/14106355/ ) and on the answer https://stackoverflow.com/a/65685183/ provided by the user 'Rory McCrossan' ( https://stackoverflow.com/u/519413/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting jQuery Class Changes: Why CSS Might Not Respond as Expected

When working with jQuery, many developers encounter a common issue: although classes change successfully in the DOM, the corresponding CSS styles do not appear to update. This problem can be particularly frustrating, especially for those new to web development. In this post, we'll explore the underlying reasons for this behavior and provide a clear, step-by-step guide to resolving it.

Understanding the Problem

In your example, you have two hexagons represented in SVG format. The intention is to change their styles when clicked—however, even when the classes clicked and unclicked are toggled, the CSS appears not to change at all. A closer look reveals a critical detail that often goes unnoticed by beginners: inline styles take precedence over CSS rules. If you have set colors directly in your SVG using inline styles, these will always override external CSS defined by classes.

Solution Breakdown

Let’s dive into the solution, which consists of two main components: adjusting CSS specificity and using unique fill colors for the classes.

Step 1: Adjust Your CSS Classes

To ensure that your CSS rules can take effect when classes change, follow these guidelines:

Use Distinct Colors: Make sure the .clicked and .unclicked classes have different fill colors. Currently, both classes set the fill color to # 0000FF, which means no visible change can happen.

Increase Specificity: Use more specific CSS selectors to ensure that they apply correctly. For example:

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

Step 2: Use toggleClass Efficiently

Instead of individually removing and adding classes on each click, utilize toggleClass to simplify the process. This will make your jQuery code cleaner and more efficient. Here's how you can do it:

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

Updated Code Snippet

Here's a complete code snippet illustrating how to implement the changes:

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

Conclusion

By redefining your classes to have different colors and optimizing your JavaScript with toggleClass, you can ensure that your CSS styles are applied as expected when interacting with your hexagons. This small adjustment can make a significant difference in how your web applications respond to user interactions. Happy coding!