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How To Conditionally Apply Css Classes In React Js

Conditional rendering in React is a powerful feature that allows developers to control how components appear based on certain conditions. One common use case is applying CSS classes dynamically in React components. To achieve this dynamic behavior, we can use conditional rendering to apply different CSS classes based on specific conditions.

In React, applying CSS classes conditionally is typically done by leveraging the `className` attribute in JSX. To conditionally apply CSS classes in React, you can use a simple ternary operator or a logical AND operator to determine which class to apply based on the component's state or props.

Let's dive into some examples to illustrate how you can conditionally apply CSS classes in React:

### Using the Ternary Operator

The ternary operator is a concise way to conditionally apply CSS classes in React components. Here's an example where we apply different CSS classes based on a certain condition:

Jsx

import React from 'react';
import './styles.css';

const App = ({ isLoggedIn }) => {
  return (
    <div>
      {isLoggedIn ? 'Welcome, User!' : 'Please log in.'}
    </div>
  );
};

export default App;

In this example, if the `isLoggedIn` prop is true, the CSS class `'logged-in'` will be applied to the `div` element; otherwise, the class `'logged-out'` will be applied.

### Using Logical AND Operator

Another approach to conditionally applying CSS classes is by using the logical AND operator (`&&`) in JSX. Here's an example to demonstrate this technique:

Jsx

import React from 'react';
import './styles.css';

const Button = ({ isPrimary }) =&gt; {
  return (
    <button>
      Click me
    </button>
  );
};

export default Button;

In this example, the class `'button'` will always be applied to the button element, but the `'primary'` class will only be added if the `isPrimary` prop is true.

By using these simple techniques, you can dynamically apply CSS classes in React components based on specific conditions, allowing you to create more interactive and responsive user interfaces.

In conclusion, mastering conditional CSS class application in React can greatly enhance the visual appeal and functionality of your web applications. By using the ternary operator or the logical AND operator, you can easily control the appearance of your components based on different states or props. Experiment with these methods in your projects to see the impact they can have on your user interface design.

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