javascript - Reactjs Listen for scroll end events - Stack Overflow

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I'm working on a small application and I'm wondering how can I listen for the end of the scroll event.

I know that the following code allows me to listen for scroll events, but in my case I'm looking for a way to trigger an event once the user stops scrolling.

window.addEventListener('scroll', () => {
  (!this.state.showScrollWidget) ? this.setState({showScrollWidget: true}) : null;
})

If anyone has an idea about the best way to do it I will appreciate the help, otherwise if there is any third party library that may do the job I will also appreciate any suggestions.

Thanks.

I'm working on a small application and I'm wondering how can I listen for the end of the scroll event.

I know that the following code allows me to listen for scroll events, but in my case I'm looking for a way to trigger an event once the user stops scrolling.

window.addEventListener('scroll', () => {
  (!this.state.showScrollWidget) ? this.setState({showScrollWidget: true}) : null;
})

If anyone has an idea about the best way to do it I will appreciate the help, otherwise if there is any third party library that may do the job I will also appreciate any suggestions.

Thanks.

• javascript
• jquery
• reactjs
• web
• scroll

Share Improve this question Follow edited May 2, 2018 at 9:34 Rory McCrossan 337k4141 gold badges319319 silver badges350350 bronze badges asked May 2, 2018 at 9:26 BenFarhat SouhaibBenFarhat Souhaib 36033 gold badges55 silver badges1717 bronze badges 3

• maybe a interval function should help, which would check last position of scroll and current position of scroll, if they are same, then it means user is not scrolling. What library are you planning to use though? – user1735921 Commented May 2, 2018 at 9:27
• yeah I know that I can do that through an interval function but I was wondering if there is any better solution, concerning the library i'm waiting for some suggestions. – BenFarhat Souhaib Commented May 2, 2018 at 9:32
• Nope. Just use a setTimeout(). There's no point in using another library for something so trivial (if one even exists - which I doubt). – Rory McCrossan Commented May 2, 2018 at 9:34

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3 Answers 3

Sorted by: Reset to default 12

I don't think there's any event to notify you that the scrolling stopped. In general, you need to wait for some time to elapse until the last scroll event. Typically you would use the debounce operation for that - many different utility libs implement it, e.g. lodash (https://lodash.com/docs/4.17.10#debounce):

window.addEventListener(
  "scroll",
  _.debounce(() => {
    console.log("scrolling stopped");
  }, 1000)
);

Solved the problem by using lodash debounce.

1. Attach onScroll event:

 <List onScroll={e => handleScroll(e)}/>

2. useMemo for the endScroll function:

 const handleEndScroll = useMemo(
    () =>
      _.debounce(() => console.log("END SCROLL"), 1000),
    []
  );

3. Handle scroll and endScroll:

 const handleScroll = e => {
    console.log("scroll scroll scroll");
    handleEndScroll();
  };

Note:

• install and import lodash
• import useMemo

The scrollend event was added to FF in 109. Blink/Webkit browsers are expected to get it in mid- to late 2023.

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