Fixing the Javascript Change Image on Mouse Hover Issue

Learn how to resolve the common issue of changing images on mouse hover in JavaScript by avoiding unique ID conflicts.
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This video is based on the question https://stackoverflow.com/q/73288686/ asked by the user 'Jobo Fernandez' ( https://stackoverflow.com/u/12783363/ ) and on the answer https://stackoverflow.com/a/73289038/ provided by the user 'Ahmad Alfy' ( https://stackoverflow.com/u/497828/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Javascript Change Image on Mouse Hover Issue: A Simple Guide

If you've ever tried to change an image with JavaScript when a user hovers over it, you might have run into some issues — especially if you are a beginner in web development. In this guide, we will address a specific problem: how to fix the image change on mouse hover that isn't working as expected. Let’s dive into the problem and find a simple solution.

The Problem

You have an HTML code snippet that successfully displays an image but fails to change from a PNG format to a GIF on a mouse hover event. Here’s the relevant part of your HTML:

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

The Current JavaScript Code

You have the following jQuery script at the bottom of your HTML:

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

Despite this code logically appearing sound, it's not functioning correctly. Let’s determine why.

Analyzing the Issue

The primary issue lies in the fact that you have duplicate IDs in your HTML. In HTML, each id must be unique across the entire document. Since you have two elements using the same ID (memory-game), jQuery is only targeting the first instance, which is the <article> tag and not the <img> tag.

This causes the hover event to fail because when you try to change the src attribute of the image, it’s not being located correctly by jQuery.

The Solution

To fix this issue, follow these simple steps:

Step 1: Remove Duplicate ID

Remove the id from the <article> tag. Your updated HTML should look like this:

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

Step 2: Test Your JavaScript Code

After making these adjustments to your HTML, keep your original JavaScript code as it is. It should now function correctly, allowing the image to change from PNG to GIF upon hover:

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

Conclusion

By ensuring that each id is unique within your HTML document, you can easily prevent common issues like the one we just solved. With this simple correction, you'll have the hover effect functioning perfectly. Don't hesitate to reach out if you have any further questions or issues! Happy coding!

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