Detailed steps to implement virtual scrolling of lists using Vue3

1. What is virtual scrolling?

Virtual scrolling is a technique that can render only the contents of the visual area in the case of large amounts of data, rather than loading all the data directly into the DOM. By dynamically loading and unloading content, the memory usage during page rendering can be reduced and page performance can be improved.

2. The principle of realizing virtual scrolling

The principle of realizing virtual scrolling is mainly to calculate the height and position of the list item, dynamically render the content in the visual area, and update the content in real time according to the scrolling position. In Vue3, we can use some instructions and computed properties to achieve this function.

3. Steps to implement virtual scrolling in Vue3

Step 1: Install dependencies

First, we need to install a dependency package called "vue3-virtual-scroller", which provides the function of implementing virtual scrolling. It can be installed through the following command:

npm install vue3-virtual-scroller

Step 2: Introduce dependencies

Introduce dependencies in the project:

import { createApp } from 'vue';
import VirtualScroller from 'vue3-virtual-scroller';
import 'vue3-virtual-scroller/dist/';

const app = createApp(App);
(VirtualScroller);

Step 3: Use in the template

Where virtual scrolling is required, usev-virtual-scrollerinstruction:

<virtual-scroller v-for="item in items" :key="" :size="50">
  <div>{{  }}</div>
</virtual-scroller>

in,itemsIt's your data list.sizeIndicates the height of each list item.

Step 4: Optimize performance

After using virtual scrolling, you may need some other optimizations to improve page performance. For example, avoid using a large number of computationally expensive operations in list items, and minimize the logical complexity in the loop, etc.

4. Sample code

Here is a simple example code that demonstrates how to implement virtual scrolling of a list in Vue3:

<template>
  <virtual-scroller v-for="item in items" :key="" :size="50">
    <div>{{  }}</div>
  </virtual-scroller>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const items = ref([]);
    
    // Simulate load list data    for (let i = 0; i < 10000; i++) {
      ({
        id: i,
        content: `Item ${i}`,
      });
    }

    return {
      items,
    };
  },
};
</script>

5. Summary

Through the above steps, we can implement virtual scrolling of lists in Vue3 project to improve page performance and user experience. Virtual scrolling is a very practical technique when processing large amounts of data

This is the end of this article about the detailed steps of Vue3 to implement virtual scrolling on list. For more relevant virtual scrolling on lists, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!