Скачать или смотреть How to Change the ul Background Image on Hovering a Specific li

Discover how to dynamically change the `ul` background image by hovering over individual `li` items using CSS and JavaScript.
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This video is based on the question https://stackoverflow.com/q/64161550/ asked by the user 'palm design' ( https://stackoverflow.com/u/14184046/ ) and on the answer https://stackoverflow.com/a/64161720/ provided by the user 'epascarello' ( https://stackoverflow.com/u/14104/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Change the ul Background Image on Hovering a Specific li

Creating an interactive web page often requires changing visual elements based on user interactions. One common scenario is changing the background image of a container when hovering over specific items within it. In this guide, we’ll explore how to change the background image of a <ul> element when hovering over particular <li> items. Let’s dive into the problem and the practical solutions available!

Understanding the Problem

You may have a list of options displayed as a vertical menu, consisting of multiple <li> items. The challenge is:

You want the background image of the <ul> (the parent element) to change dynamically depending on which <li> is being hovered over by the user.

You can't modify the HTML since it is generated dynamically by PHP, but you’re allowed to use JavaScript and CSS.

For example, when hovering over "Number 1," you want the <ul> to show a specific background image relevant to that choice, and so on for "Number 2" and "Number 3."

CSS-Only Approach: Limitations

It is important to note that CSS alone cannot change a parent element based on the state of its child. This means if you try to achieve this solely with CSS, you won't succeed because there is no parent selector in CSS. Hence, we will extensively utilize JavaScript for a seamless experience.

Setting Up the HTML Structure

Here is the basic HTML structure of our list that you’ll use:

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

Initial CSS Styling

Before we dive into JavaScript, we will set up some CSS to define our starting styles:

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

Implementing JavaScript Logic

Now, let’s add the JavaScript needed to change the <ul> background when hovering over each <li>.

Step 1: Select the Elements

We first select the <ul> and the <li> elements:

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

Step 2: Create the Hover Functionality

We create a function that will add or remove background classes based on the hovered <li>:

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

Step 3: Attach Event Listeners

Finally, we will loop through each <li> and attach event listeners for mouseenter and mouseleave:

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

Step 4: CSS Classes for Backgrounds

Next, we define CSS classes for each background image corresponding to the <li> IDs:

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

Conclusion

By following the steps outlined above, you can create a smooth and visually engaging experience where the background image of a parent <ul> changes dynamically as one hovers over its child <li> elements. Remember, the key takeaway is that utilizing JavaScript is essential for achieving this effect since CSS cannot directly manipulate parent elements based on child states.

With this knowledge, you can enhance your web applications and make them more interactive and user-friendly. Happy coding!