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326 lines
9.6 KiB
Markdown
326 lines
9.6 KiB
Markdown
## Skeleton 骨架屏
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在需要等待加载内容的位置设置一个骨架屏，某些场景下比 Loading 的视觉效果更好。
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### 基础用法
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基础的骨架效果。
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:::demo
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```html
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<template>
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<el-skeleton />
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</template>
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```
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:::
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### 更多参数
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可以配置骨架屏段落数量，以便更接近真实渲染效果。显示的数量会比传入的数量多 1，首行会被渲染一个长度 33% 的段首。
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:::demo
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```html
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<el-skeleton :rows="5" />
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```
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:::
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### 动画效果
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显示动画效果。
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:::demo
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```html
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<el-skeleton :rows="5" animated />
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```
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:::
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### 自定义样式
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ElementPlus 提供的排版模式有时候并不满足要求，当您想要用自己定义的模板时，可以通过一个具名 Slot 来自己设定模板。
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我们提供了不同的模板单元可供使用，具体可选值请看 API 详细描述。 建议在描述模板的时候，尽量靠近真实的 DOM 结构，这样可以避免 DOM 高度差距引起的抖动。
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:::demo
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```html
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<template>
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<el-skeleton style="width: 240px">
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<template #template>
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<el-skeleton-item variant="image" style="width: 240px; height: 240px;" />
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<div style="padding: 14px;">
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<el-skeleton-item variant="p" style="width: 50%" />
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<div
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style="display: flex; align-items: center; justify-items: space-between;"
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>
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<el-skeleton-item variant="text" style="margin-right: 16px;" />
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<el-skeleton-item variant="text" style="width: 30%;" />
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</div>
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</div>
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</template>
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</el-skeleton>
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</template>
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```
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:::
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### Loading 状态
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当 Loading 结束之后，我们往往需要显示真实的 UI，可以通过 `loading` 的值来控制是否显示真实的 DOM。然后通过
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具名 Slot 来设置当 loading 结束之后需要展示的 UI。
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:::demo
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```html
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<template>
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<el-space direction="vertical" alignment="flex-start">
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<div>
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<label style="margin-right: 16px;">切换 Loading</label>
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<el-switch v-model="loading" />
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</div>
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<el-skeleton style="width: 240px" :loading="loading" animated>
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<template #template>
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<el-skeleton-item
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variant="image"
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style="width: 240px; height: 240px;"
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/>
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<div style="padding: 14px;">
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<el-skeleton-item variant="h3" style="width: 50%;" />
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<div
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style="display: flex; align-items: center; justify-items: space-between; margin-top: 16px; height: 16px;"
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>
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<el-skeleton-item variant="text" style="margin-right: 16px;" />
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<el-skeleton-item variant="text" style="width: 30%;" />
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</div>
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</div>
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</template>
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<template #default>
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<el-card :body-style="{ padding: '0px', marginBottom: '1px' }">
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<img
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src="https://shadow.elemecdn.com/app/element/hamburger.9cf7b091-55e9-11e9-a976-7f4d0b07eef6.png"
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class="image"
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/>
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<div style="padding: 14px;">
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<span>好吃的汉堡</span>
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<div class="bottom card-header">
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<span class="time">{{ currentDate }}</span>
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<el-button type="text" class="button">操作按钮</el-button>
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</div>
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</div>
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</el-card>
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</template>
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</el-skeleton>
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</el-space>
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</template>
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<script>
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import { defineComponent } from 'vue'
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const dayjs = require('dayjs')
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export default defineComponent({
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data() {
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return {
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loading: true,
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currentDate: dayjs().format('YYYY-MM-DD'),
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}
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},
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})
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</script>
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```
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:::
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### 渲染多条数据
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大多时候, 骨架屏都被用来渲染列表, 当我们需要在从服务器获取数据的时候来渲染一个假的 UI。利用 `count` 这个属性就能控制渲染多少条假的数据在页面上
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:::tip
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请注意, 请尽可能的将 `count` 的大小保持在最小状态, 即使是假的 UI, DOM 元素多了之后, 照样会引起性能问题, 并且在骨架屏销毁时所消耗的时间也会更长(相对的)。
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:::
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:::demo
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```html
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<template>
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<el-space direction="vertical" alignment="flex-start">
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<el-button @click="setLoading">点我重新加载</el-button>
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<el-skeleton style="width: 240px" :loading="loading" animated :count="3">
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<template #template>
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<el-skeleton-item
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variant="image"
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style="width: 400px; height: 267px;"
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/>
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<div style="padding: 14px;">
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<el-skeleton-item variant="h3" style="width: 50%;" />
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<div
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style="display: flex; align-items: center; justify-items: space-between; margin-top: 16px; height: 16px;"
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>
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<el-skeleton-item variant="text" style="margin-right: 16px;" />
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<el-skeleton-item variant="text" style="width: 30%;" />
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</div>
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</div>
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</template>
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<template #default>
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<el-card
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:body-style="{ padding: '0px', marginBottom: '1px' }"
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v-for="item in lists"
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>
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<img :src="item.imgUrl" class="image multi-content" />
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<div style="padding: 14px;">
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<span>{{ item.name }}</span>
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<div class="bottom card-header">
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<span class="time">{{ currentDate }}</span>
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<el-button type="text" class="button">操作按钮</el-button>
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</div>
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</div>
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</el-card>
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</template>
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</el-skeleton>
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</el-space>
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</template>
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<script>
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import { defineComponent } from 'vue'
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const dayjs = require('dayjs')
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export default defineComponent({
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data() {
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return {
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loading: true,
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currentDate: dayjs().format('YYYY-MM-DD'),
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lists: [],
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}
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},
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mounted() {
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this.loading = false
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this.lists = [
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{
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imgUrl:
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'https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg',
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name: '鹿',
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},
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{
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imgUrl:
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'https://fuss10.elemecdn.com/1/34/19aa98b1fcb2781c4fba33d850549jpeg.jpeg',
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name: '马',
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},
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{
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imgUrl:
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'https://fuss10.elemecdn.com/0/6f/e35ff375812e6b0020b6b4e8f9583jpeg.jpeg',
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name: '山狮',
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},
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]
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},
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methods: {
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setLoading() {
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this.loading = true
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setTimeout(() => (this.loading = false), 2000)
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},
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},
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})
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</script>
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```
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:::
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### 防止渲染抖动
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有的时候，API 的请求回来的特别快，往往骨架占位刚刚被渲染，真实的数据就已经回来了，用户的界面会突然一闪，此时为了避免这种情况，就需要通过 `throttle` 属性来避免这个问题。
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:::demo
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```html
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<template>
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<el-space direction="vertical" alignment="flex-start">
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<div>
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<label style="margin-right: 16px;">切换 Loading</label>
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<el-switch v-model="loading" />
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</div>
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<el-skeleton
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style="width: 240px"
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:loading="loading"
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animated
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:throttle="500"
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>
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<template #template>
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<el-skeleton-item
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variant="image"
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style="width: 240px; height: 240px;"
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/>
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<div style="padding: 14px;">
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<el-skeleton-item variant="h3" style="width: 50%;" />
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<div
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style="display: flex; align-items: center; justify-items: space-between; margin-top: 16px; height: 16px;"
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>
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<el-skeleton-item variant="text" style="margin-right: 16px;" />
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<el-skeleton-item variant="text" style="width: 30%;" />
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</div>
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</div>
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</template>
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<template #default>
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<el-card :body-style="{ padding: '0px', marginBottom: '1px' }">
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<img
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src="https://shadow.elemecdn.com/app/element/hamburger.9cf7b091-55e9-11e9-a976-7f4d0b07eef6.png"
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class="image"
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/>
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<div style="padding: 14px;">
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<span>好吃的汉堡</span>
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<div class="bottom card-header">
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<span class="time">{{ currentDate }}</span>
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<el-button type="text" class="button">操作按钮</el-button>
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</div>
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</div>
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</el-card>
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</template>
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</el-skeleton>
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</el-space>
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</template>
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<script>
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import { defineComponent } from 'vue'
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const dayjs = require('dayjs')
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export default defineComponent({
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data() {
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return {
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loading: false,
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currentDate: dayjs().format('YYYY-MM-DD'),
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}
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},
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})
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</script>
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```
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:::
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### Skeleton Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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| -------- | ------------------------------------------- | ------- | ------------ | ------ |
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| animated | 是否使用动画 | boolean | true / false | false |
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| count | 渲染多少个 template, 建议使用尽可能小的数字 | number | integer | 1 |
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| loading | 是否显示真实的 DOM 结构 | boolean | true / false | false |
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| rows | 骨架屏段落数量 | number | 正整数 | 3 |
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| throttle | 延迟占位 DOM 渲染的时间, 单位是毫秒 | number | 正整数 | 0 |
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### Skeleton Item Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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| ------- | ------------------------ | ------------ | -------------------------------------------------------------------- | ------ |
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| variant | 当前显示的占位元素的样式 | Enum(string) | p / text / h1 / h3 / text / caption / button / image / circle / rect | text |
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### Skeleton Slots
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| name | description |
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| -------- | -------------------- |
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| default | 用来展示真实 UI |
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| template | 用来展示自定义占位符 |
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