Get Viewport Window Height In Reactjs

Getting the viewport window height in ReactJS is essential for creating responsive web applications that adapt well to various screen sizes. By knowing the viewport height, you can dynamically adjust the layout and content of your application to provide a better user experience. In this article, we'll explore how you can easily retrieve the viewport window height in your ReactJS applications.

One common approach to get the viewport window height in ReactJS is by utilizing the `window.innerHeight` property. This property returns the height of the browser window's viewport, excluding the browser chrome and other toolbars. To access this property within your React component, you can simply use `window.innerHeight` within your code.

import React, { useEffect, useState } from 'react';

function App() {
  const [viewportHeight, setViewportHeight] = useState(window.innerHeight);

  useEffect(() => {
    function handleResize() {
      setViewportHeight(window.innerHeight);
    }

    window.addEventListener('resize', handleResize);

    return () => window.removeEventListener('resize', handleResize);
  }, []);

  return (
    <div>
      <p>Viewport Height: {viewportHeight}</p>
    </div>
  );
}

export default App;

In the code snippet above, we create a functional component `App` that initializes `viewportHeight` state using the `useState` hook with the initial value set to `window.innerHeight`. We also utilize the `useEffect` hook to add a resize event listener to the window that updates the `viewportHeight` state whenever the window is resized. This ensures that our component always reflects the current viewport window height.

By updating the `viewportHeight` state dynamically, our React component stays in sync with the actual viewport window height, making it easy to build responsive designs and components that adjust based on the available screen space.

It's important to note that accessing the `window` object directly in React components can lead to potential issues, especially server-side rendering or testing environments where the `window` object may not be available. In such cases, you may consider using libraries like `react-viewport-height` that provide a more robust solution for calculating viewport dimensions in a React-friendly way.

In conclusion, obtaining the viewport window height in ReactJS is a crucial aspect of building responsive web applications that can adapt to different devices and screen sizes. By leveraging the `window.innerHeight` property and utilizing React hooks like `useState` and `useEffect`, you can easily retrieve and update the viewport height within your components. Remember to handle edge cases and consider using libraries for more complex scenarios to ensure a smooth user experience across various devices.