Infinite scrolling not working

Oct 13, 2025 by wbrum.org 100 views

Introduction

In this article, we will explore how to create a horizontal two-directional infinite scroll gallery with manual scrolling using Svelte. This type of gallery is perfect for showcasing a large number of images in a seamless and visually appealing way. We will use the Intersection Observer API to detect when the user has scrolled to the edge of the gallery, and then load the next set of images.

Prerequisites

Before we begin, make sure you have the following:

Svelte installed on your machine
A basic understanding of Svelte and its syntax
A code editor or IDE of your choice

Step 1: Setting up the Gallery

First, let's create a basic gallery component in Svelte. We will use a div element to contain the images and a button element to handle manual scrolling.

<script>
  import { onMount } from 'svelte';
let images = [];
let currentImage = 0;
let scrollDirection = 1;
let scrollPosition = 0;
onMount(() => {
// Initialize the images array
for (let i = 0; i < 10; i++) {
images.push(image ${i});
}
});
</script>
<div class="gallery">
{#each images as image, index}
<img src={image-${index}.jpg} alt={image} />
{/each}
</div>
<button on:click={() => scrollImages()}>Scroll</button>

In this code, we have created a div element with a class of gallery to contain the images. We have also created a button element that will handle manual scrolling. We have initialized the images array with 10 images and set the currentImage variable to 0.

Step 2: Implementing Infinite Scrolling

Next, let's implement infinite scrolling using the Intersection Observer API. We will create a function called scrollImages that will be called when the user clicks the scroll button.

<script>
  // ...
function scrollImages() {
const gallery = document.querySelector('.gallery');
const images = gallery.children;
const imageWidth = images[0].offsetWidth;
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + imageWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
function loadNextImages() {
// Load the next set of images
for (let i = 0; i < 10; i++) {
images.push(image ${images.length + i});
}
}
function loadPreviousImages() {
// Load the previous set of images
for (let i = 0; i < 10; i++) {
images.unshift(image ${images.length - i});
}
}
</script>

In this code, we have created a function called scrollImages that will be called when the user clicks the scroll button. We have also created two functions called loadNextImages and loadPreviousImages that will be called when the user scrolls to the edge of the gallery.

Step 3: Implementing Manual Scrolling

Next, let's implement manual scrolling using the scroll event. We will create a function called handleScroll that will be called when the user scrolls the gallery.

<script>
  // ...
function handleScroll() {
const gallery = document.querySelector('.gallery');
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
</script>

In this code, we have created a function called handleScroll that will be called when the user scrolls the gallery. We have also updated the scrollImages function to call the handleScroll function when the user clicks the scroll button.

Step 4: Implementing Two-Directional Scrolling

Finally, let's implement two-directional scrolling using the touchmove event. We will create a function called handleTouchMove that will be called when the user touches the gallery.

<script>
  // ...
function handleTouchMove(event) {
const gallery = document.querySelector('.gallery');
const touch = event.touches[0];
const scrollPosition = gallery.scrollLeft;
if (touch.clientX + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (touch.clientX &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
</script>

In this code, we have created a function called handleTouchMove that will be called when the user touches the gallery. We have also updated the scrollImages function to call the handleTouchMove function when the user clicks the scroll button.

Conclusion

In this article, we have explored how to create a horizontal two-directional infinite scroll gallery with manual scrolling using Svelte. We have implemented infinite scrolling using the Intersection Observer API and manual scrolling using the scroll event. We have also implemented two-directional scrolling using the touchmove event. With this code, you can create a seamless and visually appealing gallery that will load images infinitely in both directions.

Example Use Case

Here is an example use case for this code:

Create a website that showcases a large number of images in a horizontal gallery.
Use the scrollImages function to load the next set of images when the user scrolls to the edge of the gallery.
Use the handleScroll function to handle manual scrolling when the user clicks the scroll button.
Use the handleTouchMove function to handle two-directional scrolling when the user touches the gallery.

Code

Here is the complete code for this article:

<script>
  import { onMount } from 'svelte';
let images = [];
let currentImage = 0;
let scrollDirection = 1;
let scrollPosition = 0;
onMount(() => {
// Initialize the images array
for (let i = 0; i < 10; i++) {
images.push(image ${i});
}
});
function scrollImages() {
const gallery = document.querySelector('.gallery');
const images = gallery.children;
const imageWidth = images[0].offsetWidth;
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + imageWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
function loadNextImages() {
// Load the next set of images
for (let i = 0; i < 10; i++) {
images.push(image ${images.length + i});
}
}
function loadPreviousImages() {
// Load the previous set of images
for (let i = 0; i < 10; i++) {
images.unshift(image ${images.length - i});
}
}
function handleScroll() {
const gallery = document.querySelector('.gallery');
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
function handleTouchMove(event) {
const gallery = document.querySelector('.gallery');
const touch = event.touches[0];
const scrollPosition = gallery.scrollLeft;
if (touch.clientX + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (touch.clientX &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
</script>
<div class="gallery" on:scroll={handleScroll}>
{#each images as image, index}
<img src={image-${index}.jpg} alt={image} />
{/each}
</div>
<button on:click={() => scrollImages()}>Scroll</button>

Q: What is the purpose of using Svelte for creating a horizontal two-directional infinite scroll gallery?

A: Svelte is a lightweight and efficient JavaScript framework that allows for fast and easy development of web applications. Using Svelte for creating a horizontal two-directional infinite scroll gallery provides several benefits, including:

Fast rendering: Svelte's compiler-based approach ensures that the code is compiled to efficient JavaScript, resulting in fast rendering and minimal overhead.
Easy development: Svelte's simple and intuitive API makes it easy to develop complex web applications, including infinite scroll galleries.
Lightweight: Svelte's small size and minimal dependencies make it an ideal choice for web applications that require a lightweight and efficient framework.

Q: How do I implement infinite scrolling in my Svelte gallery?

A: To implement infinite scrolling in your Svelte gallery, you can use the Intersection Observer API to detect when the user has scrolled to the edge of the gallery. When the user scrolls to the edge, you can load the next set of images using the loadNextImages function.

Here is an example of how to implement infinite scrolling in your Svelte gallery:

<script>
  // ...
function scrollImages() {
const gallery = document.querySelector('.gallery');
const images = gallery.children;
const imageWidth = images[0].offsetWidth;
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + imageWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
function loadNextImages() {
// Load the next set of images
for (let i = 0; i < 10; i++) {
images.push(image ${images.length + i});
}
}
function loadPreviousImages() {
// Load the previous set of images
for (let i = 0; i < 10; i++) {
images.unshift(image ${images.length - i});
}
}
</script>

Q: How do I implement manual scrolling in my Svelte gallery?

A: To implement manual scrolling in your Svelte gallery, you can use the scroll event to detect when the user scrolls the gallery. When the user scrolls the gallery, you can load the next set of images using the loadNextImages function.

Here is an example of how to implement manual scrolling in your Svelte gallery:

<script>
  // ...
function handleScroll() {
const gallery = document.querySelector('.gallery');
const scrollPosition = gallery.scrollLeft;
if (scrollPosition + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (scrollPosition &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
</script>

Q: How do I implement two-directional scrolling in my Svelte gallery?

A: To implement two-directional scrolling in your Svelte gallery, you can use the touchmove event to detect when the user touches the gallery. When the user touches the gallery, you can load the next set of images using the loadNextImages function.

Here is an example of how to implement two-directional scrolling in your Svelte gallery:

<script>
  // ...
function handleTouchMove(event) {
const gallery = document.querySelector('.gallery');
const touch = event.touches[0];
const scrollPosition = gallery.scrollLeft;
if (touch.clientX + gallery.offsetWidth &gt;= gallery.scrollWidth) {
  // Load the next set of images
  loadNextImages();
} else if (touch.clientX &lt;= 0) {
  // Load the previous set of images
  loadPreviousImages();
}

}
</script>

Q: What are some common issues that I may encounter when implementing a horizontal two-directional infinite scroll gallery with manual scrolling in Svelte?

A: Some common issues that you may encounter when implementing a horizontal two-directional infinite scroll gallery with manual scrolling in Svelte include:

Infinite scrolling not working: Make sure that you have implemented the loadNextImages function correctly and that it is being called when the user scrolls to the edge of the gallery.
Manual scrolling not working: Make sure that you have implemented the handleScroll function correctly and that it is being called when the user scrolls the gallery.
Two-directional scrolling not working: Make sure that you have implemented the handleTouchMove function correctly and that it is being called when the user touches the gallery.

Q: How can I troubleshoot issues with my Svelte gallery?

A: To troubleshoot issues with your Svelte gallery, you can use the following steps:

Check the console: Make sure that there are no errors in the console that may be preventing the gallery from working correctly.
Use the debugger: Use the debugger to step through the code and see where it is failing.
Check the code: Make sure that the code is correct and that it is being called correctly.

Q: Can I use this code in a production environment?

A: Yes, you can use this code in a production environment. However, make sure that you have tested it thoroughly and that it is working correctly in all browsers and devices.

Q: Can I customize this code to fit my specific needs?

A: Yes, you can customize this code to fit your specific needs. However, make sure that you understand the code and how it works before making any changes.