96 lines
3.0 KiB
Markdown
96 lines
3.0 KiB
Markdown
<cn>
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#### 滚动加载无限长列表
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结合 [vue-virtual-scroller](https://github.com/Akryum/vue-virtual-scroller) 实现滚动加载无限长列表，带有虚拟化（[virtualization](https://blog.jscrambler.com/optimizing-react-rendering-through-virtualization/)）功能，能够提高数据量大时候长列表的性能。
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可以结合 [vue-infinite-scroll](https://github.com/ElemeFE/vue-infinite-scroll) 实现滚动自动加载无限长列表。
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`virtualized` 是在大数据列表中应用的一种技术，主要是为了减少不可见区域不必要的渲染从而提高性能，特别是数据量在成千上万条效果尤为明显。
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</cn>
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<us>
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#### Infinite & virtualized
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An example of infinite list & virtualized loading using [vue-virtual-scroller](https://github.com/Akryum/vue-virtual-scroller).
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`Virtualized` rendering is a technique to mount big sets of data. It reduces the amount of rendered DOM nodes by tracking and hiding whatever isn't currently visible.
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</us>
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```html
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<template>
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<a-list>
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<virtual-scroller
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style="height: 400px"
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:items="data"
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item-height="73"
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v-infinite-scroll="handleInfiniteOnLoad"
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:infinite-scroll-disabled="busy"
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:infinite-scroll-distance="10"
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>
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<a-list-item slot-scope="{item}">
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<a-list-item-meta :description="item.email">
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<a slot="title" :href="item.href">{{item.name.last}}</a>
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<a-avatar slot="avatar" src="https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png" />
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</a-list-item-meta>
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<div>Content {{item.index}}</div>
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</a-list-item>
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</virtual-scroller>
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<a-spin v-if="loading" class="demo-loading" />
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</a-list>
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</template>
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<script>
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import reqwest from 'reqwest'
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import infiniteScroll from 'vue-infinite-scroll'
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import { VirtualScroller } from 'vue-virtual-scroller'
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const fakeDataUrl = 'https://randomuser.me/api/?results=10&inc=name,gender,email,nat&noinfo'
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export default {
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directives: { infiniteScroll },
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data () {
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return {
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data: [],
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loading: false,
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busy: false,
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}
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},
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beforeMount () {
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this.fetchData((res) => {
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this.data = res.results.map((item, index) => ({ ...item, index }))
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})
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},
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methods: {
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fetchData (callback) {
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reqwest({
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url: fakeDataUrl,
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type: 'json',
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method: 'get',
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contentType: 'application/json',
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success: (res) => {
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callback(res)
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},
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})
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},
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handleInfiniteOnLoad () {
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const data = this.data
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this.loading = true
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if (data.length > 100) {
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this.$message.warning('Infinite List loaded all')
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this.busy = true
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this.loading = false
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return
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}
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this.fetchData((res) => {
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this.data = data.concat(res.results).map((item, index) => ({ ...item, index }))
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this.loading = false
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})
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},
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},
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components: {
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'virtual-scroller': VirtualScroller,
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},
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}
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</script>
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<style>
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.demo-loading {
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position: absolute;
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bottom: 40px;
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width: 100%;
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text-align: center;
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}
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</style>
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```
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