How to perform virtual scrolling and big data optimization in Vue
In Vue applications, you may experience performance issues when large amounts of data need to be rendered. This is because the browser needs to render a large number of DOM elements, which can lead to slow page loading and high memory consumption. To solve this problem, we can use virtual scrolling and big data optimization techniques to improve the performance and user experience of the application.
What is virtual scrolling?
Virtual scrolling is a technique that only renders a portion of the DOM elements that are currently visible, rather than rendering the entire dataset. This technique can drastically reduce page load time and memory consumption because it only renders what the user really needs to see.
In Vue, we can use third-party libraries to achieve virtual scrolling. Among the more popular libraries are vue-virtual-scrollerand vue-virtual-scroll-list. These libraries provide some components and directives to facilitate virtual scrolling.
Here's an vue-virtual-scrollerexample that implements virtual scrolling using:
<template>
<div>
<virtual-scroller :items="items" item-height="40">
<div slot-scope="{ item }">{
{ item }}</div>
</virtual-scroller>
</div>
</template>
<script>
import {
VirtualScroller } from 'vue-virtual-scroller'
export default {
components: {
VirtualScroller
},
data() {
return {
items: []
}
},
created() {
// 生成10000个数据
for (let i = 0; i < 10000; i++) {
this.items.push(`Item ${
i}`)
}
}
}
</script>
In the above example, we used vue-virtual-scrollerthe library to implement virtual scrolling. We store datasets in itemsarrays and use <virtual-scroller>components to render those data. We also set item-heightproperties to tell the component the height of each element.
Note that in <virtual-scroller>the component, we use slot-scopeto access each data item. This is because vue-virtual-scrollerVue's slot mechanism is used to achieve virtual scrolling.
What is Big Data Optimization?
Big data optimization refers to the adoption of techniques to improve the performance of applications when dealing with large amounts of data. These techniques include data caching, paging, virtual scrolling, and more.
In Vue, we can use third-party libraries such as vue-virtual-scrollerand vue-virtual-scroll-listto achieve big data optimization. These libraries can handle hundreds of thousands or even millions of records without affecting application performance and user experience.
The following is an vue-virtual-scroll-listexample of using to achieve big data optimization:
<template>
<div>
<virtual-scroll-list :size="100" :remain="20" :data-key="dataKey" :data-sources="dataSource">
<template slot-scope="{ data }">
<div>{
{ data }}</div>
</template>
</virtual-scroll-list>
</div>
</template>
<script>
import {
VirtualScrollList } from 'vue-virtual-scroll-list'
export default {
components: {
VirtualScrollList
},
data() {
return {
dataSource: [],
dataKey: 'id'
}
},
created() {
// 生成100000个数据
for (let i = 1; i <= 100000; i++) {
this.dataSource.push({
id: i,
name: `Item ${
i}`
})
}
}
}
</script>
In the above example, we used vue-virtual-scroll-listthe library to achieve big data optimization. We store datasets in dataSourcearrays and use <virtual-scroll-list>components to render those data. We also set sizeproperties to tell the component how many data items to render each time, and remainproperties to tell the component how many data items to keep.
Note that in <virtual-scroll-list>the component, we use slot-scopeto access each data item. This is because vue-virtual-scroll-listVue's slot mechanism is used to achieve big data optimization.
Summarize
In this article, we learned how to implement virtual scrolling and big data optimization in a Vue application. Virtual scrolling can help us improve page load time and memory consumption, while big data optimization can help us handle large amounts of data without affecting application performance and user experience.
In order to achieve virtual scrolling and big data optimization, we can use third-party libraries such as vue-virtual-scrollerand vue-virtual-scroll-list. These libraries provide components and instructions that facilitate virtual scrolling and big data optimization.
In actual development, if we need to render a large amount of data, we should consider using virtual scrolling and big data optimization to improve the performance and user experience of the application.