In order to determine if components linked from anchor elements are visible on the screen in Next.js, a thorough examination of the components

Question

In order to determine if components linked from anchor elements are visible on the screen in Next.js, a thorough examination of the components

Currently, I am in the process of developing my own single-page website using Next.js and Typescript. The site consists of two sections: one (component 1) displaying my name and three anchor elements with a 'sticky' setting for easy navigation, and another section (component 2) containing three components that are linked to by the anchor elements. My goal is to determine if each component is visible on the screen and adjust the style of the corresponding anchor element based on this information.

The main challenge I am facing and seeking help on includes:

As the two sections are separate child components within the main 'page.tsx', how can I pass the reference information of component 2 to component 1?
One of the components in component 2 relies on server-side actions that involve fetching data. Is there a way to use 'useEffect' to continuously monitor the view state of this component?

In my search for a solution, I came across two potential options:

Intersection Observer
useInview

Although I attempted to implement these solutions, I have not been able to resolve the challenges mentioned earlier, and thus, I am still struggling with this issue.

javascript typescript next.js

Answer 1

Answer №1

If you're looking for a way to determine when specific elements become visible on the screen, I highly suggest utilizing the IntersectionObserver tool. This handy feature allows you to pinpoint when an element enters your desired visibility threshold within the viewport. Here's a quick example of how it can be implemented:

"use client";

import { useEffect } from "react";

export default MyClientComponent(): JSX.Element {
  useEffect(() => {
    // Locate your target elements
    const el1 = document.getElementById("el1");
    const el2 = document.getElementById("el2");
    const el3 = document.getElementById("el3");

    const observer = new IntersectionObserver(entries => {
      // Perform actions based on the observed entries
    });

    // Start observing each located element
    if (!!el1) observer.observe(el1);
    if (!!el2) observer.observe(el2);
    if (!!el3) observer.observe(el3);

    // Cease observation upon component unmount
    return () => {
      if (!!el1) observer.unobserve(el1);
      if (!!el2) observer.unobserve(el2);
      if (!!el3) observer.unobserve(el3);
    };
  }, []);

  return <>{/* Insert your markup here */}</>;
}

In addition, you have the option to include a second argument in the IntersectionObserver constructor – the options object, which empowers you to customize its functionality:

root: Specifies the element that serves as the reference point for visibility comparison. It must be the ancestor of the target element. If not defined or explicitly set to null, it defaults to the browser viewport.
rootMargin: Adjusts the boundaries of the root element's box prior to calculating intersections. These values mirror those utilized in CSS margins.
threshold: Either a singular value or an array representing various percentages at which the observer's callback triggers based on target visibility. Quantities range between 0 and 1.0, with 1.0 indicating full visibility inside the viewport.

Answer 2

If you're looking for a way to determine when specific elements become visible on the screen, I highly suggest utilizing the IntersectionObserver tool. This handy feature allows you to pinpoint when an element enters your desired visibility threshold within the viewport. Here's a quick example of how it can be implemented:

"use client";

import { useEffect } from "react";

export default MyClientComponent(): JSX.Element {
  useEffect(() => {
    // Locate your target elements
    const el1 = document.getElementById("el1");
    const el2 = document.getElementById("el2");
    const el3 = document.getElementById("el3");

    const observer = new IntersectionObserver(entries => {
      // Perform actions based on the observed entries
    });

    // Start observing each located element
    if (!!el1) observer.observe(el1);
    if (!!el2) observer.observe(el2);
    if (!!el3) observer.observe(el3);

    // Cease observation upon component unmount
    return () => {
      if (!!el1) observer.unobserve(el1);
      if (!!el2) observer.unobserve(el2);
      if (!!el3) observer.unobserve(el3);
    };
  }, []);

  return <>{/* Insert your markup here */}</>;
}

In addition, you have the option to include a second argument in the IntersectionObserver constructor – the options object, which empowers you to customize its functionality:

root: Specifies the element that serves as the reference point for visibility comparison. It must be the ancestor of the target element. If not defined or explicitly set to null, it defaults to the browser viewport.
rootMargin: Adjusts the boundaries of the root element's box prior to calculating intersections. These values mirror those utilized in CSS margins.
threshold: Either a singular value or an array representing various percentages at which the observer's callback triggers based on target visibility. Quantities range between 0 and 1.0, with 1.0 indicating full visibility inside the viewport.

In order to determine if components linked from anchor elements are visible on the screen in Next.js, a thorough examination of the components

Answer №1

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