React – mouse button press and hold example

This content originally appeared on DEV Community and was authored by Dirask-React

Hi there! ??

In this article, I would like to show you mouse button press and hold example in React. ?

Before we start, I would highly recommend you to check out the runnable example for the solution on our website:
React - mouse button press and hold example

In the beginning, I wanted to tell you that unfortunately there is no press and hold mouse button event in React. ?
However, I will show you how to perform some logic when the mouse button is pressed and held, and how to break this logic when we stop pressing the button or when our cursor leaves the button field.

Final result:

Below example presents how to create a counter which increments on button press and hold every 0.1s. As the counter increases, the height and width of my element also increase, as they depend precisely on the counter.

In the example I've used:

useState hook - to manage the counter as App component's state,
useRef hook - to create a reference that will help us to set and clear the interval,
onMouseDown event - to start incrementing the counter,
onMouseUp / onMouseLeave events - to stop incrementing the counter,
useEffect hook - to stop the counter when App component is destroyed.

Practical example:

import React from 'react';

const App = () => {
  const [counter, setCounter] = React.useState(100);
  const intervalRef = React.useRef(null);

  React.useEffect(() => {
    return () => stopCounter(); // when App is unmounted we should stop counter
  }, []);

// styles --------------------------------------

  const containerStyle = {
    height: '300px',
    width: '300px',
  };

  const elementStyle = {
    margin: '5px',
    height: `${counter}px`,
    width: `${counter}px`,
    background: 'radial-gradient(at 25% 25%, #2b86c5, #562b7c, #ff3cac)',
    border: '2px solid black',
    borderRadius: '50%',
    boxShadow: '10px 5px 5px #BEBEBE',
  };

// functions -----------------------------------

  const startCounter = () => {
    if (intervalRef.current) return;
    intervalRef.current = setInterval(() => {
      setCounter((prevCounter) => prevCounter + 1);
    }, 10);
  };

  const stopCounter = () => {
    if (intervalRef.current) {
      clearInterval(intervalRef.current);
      intervalRef.current = null;
    }
  };

  return (
    <div style={containerStyle}>
      <div
        onMouseDown={startCounter}
        onMouseUp={stopCounter}
        onMouseLeave={stopCounter}
        style={elementStyle}
      />
    </div>
  );
};

export default App;

You can run this example here

That's my version of handling mouse press and hold event in React.
Let me know what you think in the comments. ?
Maybe you have a better solution? I would be glad if you share it with me! ?

Thanks for your time and see you in the next posts! ?

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This content originally appeared on DEV Community and was authored by Dirask-React

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