How to Use :hover to Modify the CSS of a Different Class?

How to Use :hover to Modify the CSS of Another Class

There are instances when you may want to modify the CSS of one class when hovering on an element from another class using only CSS. This technique is particularly useful if you want to create visually appealing effects without relying on JavaScript.

CSS-Only Solutions:

To achieve this effect using CSS alone, there are two main approaches:

• The element you want to modify (F) is either a child element of the element you hover on (E), or
• F is a later-sibling or descendant sibling of E (E appears in the markup/DOM before F).

First Option: F as a Child of E

If F is a child element of E, you can use the following CSS selector:

<code class="css">.item:hover .wrapper {
    color: #fff;
    background-color: #000;
}</code>

This selector will apply the specified CSS rules to the .wrapper element only when the .item element is hovered on.

Second Option: F as a Sibling of E

If F is a sibling element of E, you can use the following CSS selector:

<code class="css">.item:hover ~ .wrapper {
    color: #fff;
    background-color: #000;
}</code>

This selector will apply the CSS rules to the .wrapper element only when the .item element is hovered on, assuming that .wrapper is a direct sibling of .item. You can also use .item:hover .wrapper if .wrapper is an immediate sibling of .item with no other elements between them.

JavaScript Solution:

If you cannot achieve the desired effect using CSS alone, you can resort to JavaScript. Here's a simple example:

<code class="javascript">document.getElementsByClassName('item')[0].onmouseover = function() {
    document.getElementsByClassName('wrapper')[0].style.background = "url('some url')";
};</code>

This JavaScript code will modify the background property of the .wrapper element when the .item element is hovered on. Note that this solution is not as efficient or elegant as the CSS-only approaches.

Conclusion:

Using CSS or JavaScript, you can modify the CSS of one class based on the hovering of another class. The CSS-only solutions are more preferable due to their efficiency and simplicity, but JavaScript can be used in cases where CSS is not sufficient.

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