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Resize event in react

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by vsasikalabe dot icon Updated: Feb 21, 2023

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Responding to the available visual space, we attempt to create React apps with flexible UIs. Sometimes, this would be more practical. In such instances, When the window or viewport size changes, it can be useful to re-render a React component explicitly. When its props or state changes, React will re-render a component to trigger a re-render of MyComponent in the example, we'll set the internal state on the component if the event is detected. 


When the document view (window) has been resized, the resize event fires. Registering to resize event handlers on any HTML element at some earlier was possible. Getting the current size of the browser window is a prevalent need. An object returns with the window's width and height by this hook. The width and height value will be undefined if this is executed server-side (no window object). addEventListener accepts the event type. We will add the event listener to the useEffect hook to remove an event listener in React. Return a function from the useEffect hook. When the component unmounts, use the removeEventListener method to remove the event listener. 

This can be done with useEffect. The function also returns a function when passing a function to useEffect. The returned function will be called to perform any needed cleanup. To call and bind the new function that returns to the debouncedHandleResize variable, we must wrap handleResize in a debounce(). Then we use this variable both in the event listener setup and cleanup. 


Here is an example of how to create Resize event in Reactjs: 

Preview of the output that you will get on running this code from your IDE.

Code:

In this solution we use the React library.

Resize event in react

JavaScriptdotLines of Code : 37dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
import { useState, useEffect } from "react";
// Usage
function App() {
  const size = useWindowSize();
  return (
    <div>
      {size.width}px / {size.height}px
    </div>
  );
}
// Hook
function useWindowSize() {
  // Initialize state with undefined width/height so server and client renders match
  // Learn more here: https://joshwcomeau.com/react/the-perils-of-rehydration/
  const [windowSize, setWindowSize] = useState({
    width: undefined,
    height: undefined,
  });
  useEffect(() => {
    // Handler to call on window resize
    function handleResize() {
      // Set window width/height to state
      setWindowSize({
        width: window.innerWidth,
        height: window.innerHeight,
      });
    }
    // Add event listener
    window.addEventListener("resize", handleResize);
    // Call handler right away so state gets updated with initial window size
    handleResize();
    // Remove event listener on cleanup
    return () => window.removeEventListener("resize", handleResize);
  }, []); // Empty array ensures that effect is only run on mount
  return windowSize;
}

Instructions

Follow the steps carefully to get the output easily.

  1. Install the Node.js and React on your IDE(preferable Visual Studio Code).
  2. Create React Application using npx create-react-app foldername.
  3. cd foldername.
  4. Open the folder in IDE.
  5. Copy the code using "copy" button above and paste it in App.js file(remove the earlier code from App.js).
  6. Add export default App to the last line of the code.
  7. Open the terminal from IDE.
  8. npm start to run the file.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


I found this code snippet by searching for Resize event in react in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in VS Code 1.73.1 version.
  2. The solution is tested on Nodejs 16.14.2 version.
  3. react 18.2.0 version


Using this solution, we are able to do resize event in react with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to do resize event in react.

Dependent Libraries

create-react-appby facebook

JavaScript doticonstar image 100082 doticonVersion:v5.0.1doticon
License: Permissive (MIT)

Set up a modern web app by running one command.

Support
    Quality
      Security
        License
          Reuse

            create-react-appby facebook

            JavaScript doticon star image 100082 doticonVersion:v5.0.1doticon License: Permissive (MIT)

            Set up a modern web app by running one command.
            Support
              Quality
                Security
                  License
                    Reuse

                      You can search for any dependent library on kandi like react.

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