How to generate an underscore effect while hovering in React and Tailwind CSS?

Elegant mouseover underscore effect in React and Tailwind CSS

This article demonstrates how to efficiently create underscore text effects when mouseover is hovered using Tailwind CSS in React projects. Previous attempts may have failed due to problems with the use of the Tailwind CSS class names or the selector order. The following methods can ensure that the effect is presented correctly.

Let's first look at an improved code example:

<div classname="relative inline-block mr-8 cursor-pointer hover:after:absolute hover:after:content-[''] hover:after:bottom-0 hover:after:left-0 hover:after:w-full hover:after:h-[1px] hover:after:bg-[#3D3D3D]">
  <p>Menu item text</p>
</div>

Code details:

• relative : This is the key! This class enables the ::after pseudo-element to be positioned relative to its parent element ( div ).
• inline-block : Ensure that elements occupy a row of space and facilitate the underline extension horizontally. (If your p element itself already occupies a row, you can remove this class)
• mr-8 : Tailwind CSS margin right, adjust element spacing.
• cursor-pointer : Change the mouse pointer to a hand pointer.
• hover:after:absolute : ::after pseudo-element is set to absolute positioning only when hovering.
• hover:after:content-[''] : Generate an empty pseudo-element.
• hover:after:bottom-0 : Places the pseudo-element at the bottom of the parent element.
• hover:after:left-0 : Place the pseudo-element to the left of the parent element.
• hover:after:w-full : The pseudo-element width is set to 100% of the parent element.
• hover:after:h-[1px] : The height of the pseudo-element is set to 1 pixel to form thin lines.
• hover:after:bg-[#3D3D3D] : Set the background color of the pseudo-element to dark gray.

Improvement instructions:

This code is simpler and easier to read than previous versions, and avoids unnecessary class names and comments. The hover modifier is correctly applied to the ::after pseudo-element, ensuring that the underscore only appears when the mouse is hovered. The height has also been changed to a more standard h-[1px] . By using square brackets [] , we can directly use variables or expressions in the Tailwind CSS class name to make the code more flexible.

Through the above steps, you can easily achieve mouse over underscores in your React and Tailwind CSS projects. Remember to check that your Tailwind CSS configuration is correct and has been introduced correctly.

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