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To add a hover class in React, you need to follow these steps:

• Set the onMouseOver and onMouseOut attributes on the element .
• Track whether the user is hovering over an element in a state variable.
• Conditionally add classes based on a state variable.

import './App.css';

import {useState} from 'react';

const App = () => {
  const [isHovering, setIsHovering] = useState(false);

  const handleMouseOver = () => {
    setIsHovering(true);
  };

  const handleMouseOut = () => {
    setIsHovering(false);
  };

  return (
    <div>
      <div>
        <div
          className={isHovering ? 'bg-salmon' : ''}
          onMouseOver={handleMouseOver}
          onMouseOut={handleMouseOut}
        >
          Hover me
        </div>
      </div>
    </div>
  );
};

export default App;

Here is the App.css file for the example.

.bg-salmon {
  background-color: salmon;
  color: white;
}

We set the onMouseOver property on the div element, so every time the user hovers the mouse over that element, handleMouseOverthe function will be called.

The mouseover event is fired when the user moves the cursor over the element or one of its child elements .

In our handleMouseOverfunction, we simply set the isHovering state variable to true .

Instead, in our handleMouseOutfunction, we set the state variable to false .

The mouseout event is fired when the user's cursor is no longer contained within the element or one of its child elements .

We use the ternary operator to conditionally add the class to the element.

<div
  className={isHovering ? 'bg-salmon' : ''}
  onMouseOver={handleMouseOver}
  onMouseOut={handleMouseOut}
>
  Hover me
</div>

The ternary operator is if/elsevery similar to the statement.

It checks if the value to the left of the question mark is true, if so then the operator returns the value to the left of the colon, otherwise it returns the value to the right.

In other words, if the isHovering variable stores a true value, we bg-salmonadd the class to the element, otherwise we return an empty string.

When the user hovers over the div element:

• Call the handleMouseOver function.
• The isHovering state variable is set to true .
• The class is added to the element.

Conversely, when the user moves the cursor outside divthe element:

• Call the handleMouseOut function.
• The isHovering state variable is set to false .
• The class is not added to the element.