What could be causing the delay in scrolling when clicking on a React Router Link?

Question

What could be causing the delay in scrolling when clicking on a React Router Link?

Having an issue with my React Nav bar. When a user clicks on it, it's supposed to scroll to a specific part of the page. However, there's a noticeable delay of about 1.5 seconds before the action takes place. Any suggestions on how to resolve this?

Here is the code for Navbar.js:

import React from "react";
import { Link } from 'react-scroll';
import { FaBars, FaTimes } from 'react-icons/fa';
import { useState, useEffect } from "react";
import '../styles/Navbar.css';

// More code here...

export default Navbar;

Also, here is the snippet from Navbar.css:

.header {
  // CSS styles here
}

// More CSS styles here...

javascript html css reactjs react-scroll

Answer 1

Answer №1

Upon review, the main concern I have identified in this code is an unintended consequence. The code continuously adds a new scroll event listener each time the component re-renders without cleaning up any of them. This results in a growing workload, as it enqueues React state updates with each added listener. Given the intrusive nature of the scroll event, it likely leads to unnecessary and excessive work being generated.

To address this issue, consider moving the window.addEventListener logic into a useEffect hook and include a cleanup function to remove the event listener.

For instance:

const [fix, setFix] = useState(window.scrollY >= 950);

useEffect(() => {
  const setFixed = () => {
    setFix(window.scrollY >= 950);
  };

  window.addEventListener("scroll", setFixed);

  return () => {
    window.removeEventListener("scroll", setFixed);
  };
}, []);

Alternatively, you may opt to directly retrieve the window.scrollY value during rendering and bypass the need for the fix state and additional listeners altogether.

For example:

const fix = window?.scrollY >= 950;

return (
  <div className={fix ? 'header active' : 'header'}>
    <nav className={fix ? 'navbar fixed' : 'navbar'}>
      ...

Answer 2

Upon review, the main concern I have identified in this code is an unintended consequence. The code continuously adds a new scroll event listener each time the component re-renders without cleaning up any of them. This results in a growing workload, as it enqueues React state updates with each added listener. Given the intrusive nature of the scroll event, it likely leads to unnecessary and excessive work being generated.

To address this issue, consider moving the window.addEventListener logic into a useEffect hook and include a cleanup function to remove the event listener.

For instance:

const [fix, setFix] = useState(window.scrollY >= 950);

useEffect(() => {
  const setFixed = () => {
    setFix(window.scrollY >= 950);
  };

  window.addEventListener("scroll", setFixed);

  return () => {
    window.removeEventListener("scroll", setFixed);
  };
}, []);

Alternatively, you may opt to directly retrieve the window.scrollY value during rendering and bypass the need for the fix state and additional listeners altogether.

For example:

const fix = window?.scrollY >= 950;

return (
  <div className={fix ? 'header active' : 'header'}>
    <nav className={fix ? 'navbar fixed' : 'navbar'}>
      ...

What could be causing the delay in scrolling when clicking on a React Router Link?

Answer №1

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