How to display HTML on top without altering the viewport in React?

Question

How to display HTML on top without altering the viewport in React?

I am trying to display a component <Top /> above another component <Bottom /> in React. The code structure is as follows:

...
[top, setTop] = useState(false);
[bottom, setBottom] = useState(true);
...

return (
<div>
 top && (<Top />)
 bottom && (<Bottom />)
 <button onClick = { () => setTop(true) } />
</div>
)

The issue I am facing is that when the user clicks the button to render <Top /> while seeing <Bottom />, there is an "instant scrolling" effect that changes the viewport position to <Top />.

Is there a way to render the component without changing the current viewport position?

Should I consider using CSS or javascript techniques to achieve this?

html css reactjs render viewport

Answer 1

Answer №1

If you want to maintain the scroll position, consider using the useEffect hook along with a reference to the specific element. Below is an example:

useEffect(() => {
  // store the current scroll position of the bottom element
  let currentPosition = bottomElementRef.scrollTop // initial run
  if (top) {
    // update the scroll position when a top element is added
    bottomElementRef.scrollTop = currentPosition // second run for top
  }
},[top])

I hope this explanation assists you in resolving the problem.

Answer 2

If you want to maintain the scroll position, consider using the useEffect hook along with a reference to the specific element. Below is an example:

useEffect(() => {
  // store the current scroll position of the bottom element
  let currentPosition = bottomElementRef.scrollTop // initial run
  if (top) {
    // update the scroll position when a top element is added
    bottomElementRef.scrollTop = currentPosition // second run for top
  }
},[top])

I hope this explanation assists you in resolving the problem.

Answer 3

Answer №2

Give this a shot:

try {
  return (
    <div>
      {header && <Header />}
      {footer && <Footer />}
      <button onClick={() => setHeader(true)} />
    </div>
  );
} catch (error) {
  console.log('An error occurred: ' + error);
}

Answer 4

Give this a shot:

try {
  return (
    <div>
      {header && <Header />}
      {footer && <Footer />}
      <button onClick={() => setHeader(true)} />
    </div>
  );
} catch (error) {
  console.log('An error occurred: ' + error);
}

How to display HTML on top without altering the viewport in React?

Answer №1

Answer №2

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