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90bc266491
* feat(docs): Loading code for composition * feat(docs): Loading code for ElLoading Co-authored-by: 无星 <32910694@qq.com>
317 lines
8.4 KiB
Markdown
317 lines
8.4 KiB
Markdown
## Loading 加载
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加载数据时显示动效。
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### 区域加载
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在表格等容器中加载数据时显示。
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:::demo Element Plus 提供了两种调用 Loading 的方法：指令和服务。对于自定义指令`v-loading`，只需要绑定`Boolean`即可。默认状况下，Loading 遮罩会插入到绑定元素的子节点，通过添加`body`修饰符，可以使遮罩插入至 DOM 中的 body 上。
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```html
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<template>
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<el-table
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v-loading="loading"
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:data="tableData"
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style="width: 100%">
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<el-table-column
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prop="date"
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label="日期"
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width="180">
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</el-table-column>
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<el-table-column
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prop="name"
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label="姓名"
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width="180">
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</el-table-column>
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<el-table-column
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prop="address"
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label="地址">
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</el-table-column>
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</el-table>
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</template>
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<style>
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body {
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margin: 0;
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}
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</style>
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<script>
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export default {
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data() {
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return {
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tableData: [{
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date: '2016-05-03',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}, {
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date: '2016-05-02',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}, {
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date: '2016-05-04',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}],
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loading: true
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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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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export default defineComponent({
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setup() {
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const state = reactive({
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tableData: [
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{
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date: '2016-05-03',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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{
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date: '2016-05-02',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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{
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date: '2016-05-04',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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],
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loading: true,
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});
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return {
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...toRefs(state),
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 自定义
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可自定义加载文案、图标和背景色。
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:::demo 在绑定了`v-loading`指令的元素上添加`element-loading-text`属性，其值会被渲染为加载文案，并显示在加载图标的下方。类似地，`element-loading-spinner`和`element-loading-background`属性分别用来设定图标类名和背景色值。
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```html
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<template>
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<el-table
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v-loading="loading"
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element-loading-text="拼命加载中"
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element-loading-spinner="el-icon-loading"
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element-loading-background="rgba(0, 0, 0, 0.8)"
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:data="tableData"
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style="width: 100%">
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<el-table-column
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prop="date"
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label="日期"
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width="180">
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</el-table-column>
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<el-table-column
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prop="name"
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label="姓名"
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width="180">
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</el-table-column>
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<el-table-column
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prop="address"
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label="地址">
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</el-table-column>
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</el-table>
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</template>
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<script>
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export default {
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data() {
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return {
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tableData: [{
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date: '2016-05-03',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}, {
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date: '2016-05-02',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}, {
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date: '2016-05-04',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄'
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}],
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loading: true
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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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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export default defineComponent({
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setup() {
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const state = reactive({
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tableData: [
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{
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date: '2016-05-03',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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{
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date: '2016-05-02',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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{
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date: '2016-05-04',
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name: '王小虎',
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address: '上海市普陀区金沙江路 1518 弄',
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},
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],
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loading: true,
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});
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return {
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...toRefs(state),
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 整页加载
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页面数据加载时显示。
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:::demo 当使用指令方式时，全屏遮罩需要添加`fullscreen`修饰符（遮罩会插入至 body 上），此时若需要锁定屏幕的滚动，可以使用`lock`修饰符；当使用服务方式时，遮罩默认即为全屏，无需额外设置。
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```html
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<template>
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<el-button
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type="primary"
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@click="openFullScreen1"
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v-loading.fullscreen.lock="fullscreenLoading">
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指令方式
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</el-button>
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<el-button
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type="primary"
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@click="openFullScreen2">
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服务方式
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</el-button>
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</template>
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<script>
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export default {
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data() {
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return {
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fullscreenLoading: false
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}
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},
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methods: {
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openFullScreen1() {
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this.fullscreenLoading = true;
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setTimeout(() => {
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this.fullscreenLoading = false;
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}, 2000);
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},
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openFullScreen2() {
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const loading = this.$loading({
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lock: true,
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text: 'Loading',
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spinner: 'el-icon-loading',
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background: 'rgba(0, 0, 0, 0.7)'
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});
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setTimeout(() => {
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loading.close();
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}, 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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<setup>
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import { defineComponent, ref } from 'vue';
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import { ElLoading } from 'element-plus';
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export default defineComponent({
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setup() {
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const fullscreenLoading = ref(false);
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const openFullScreen1 = () => {
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fullscreenLoading.value = true;
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setTimeout(() => {
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fullscreenLoading.value = false;
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}, 2000);
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};
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const openFullScreen2 = () => {
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const loading = ElLoading.service({
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lock: true,
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text: 'Loading',
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spinner: 'el-icon-loading',
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background: 'rgba(0, 0, 0, 0.7)',
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});
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setTimeout(() => {
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loading.close();
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}, 2000);
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};
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return {
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fullscreenLoading,
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openFullScreen1,
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openFullScreen2,
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 服务
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Loading 还可以以服务的方式调用。引入 Loading 服务：
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```javascript
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import { ElLoading } from 'element-plus';
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```
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在需要调用时：
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```javascript
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ElLoading.service(options);
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```
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其中 `options` 参数为 Loading 的配置项，具体见下表。`LoadingService` 会返回一个 Loading 实例，可通过调用该实例的 `close` 方法来关闭它：
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```javascript
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let loadingInstance = ElLoading.service(options);
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this.$nextTick(() => { // 以服务的方式调用的 Loading 需要异步关闭
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loadingInstance.close();
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});
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```
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需要注意的是，以服务的方式调用的全屏 Loading 是单例的：若在前一个全屏 Loading 关闭前再次调用全屏 Loading，并不会创建一个新的 Loading 实例，而是返回现有全屏 Loading 的实例：
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```javascript
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let loadingInstance1 = ElLoading.service({ fullscreen: true });
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let loadingInstance2 = ElLoading.service({ fullscreen: true });
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console.log(loadingInstance1 === loadingInstance2); // true
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```
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此时调用它们中任意一个的 `close` 方法都能关闭这个全屏 Loading。
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如果完整引入了 Element，那么 `app.config.globalProperties` 上会有一个全局方法 `$loading`，它的调用方式为：`this.$loading(options)`，同样会返回一个 Loading 实例。
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### Options
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------------- |---------- |-------------------------------- |-------- |
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| target | Loading 需要覆盖的 DOM 节点。可传入一个 DOM 对象或字符串；若传入字符串，则会将其作为参数传入 `document.querySelector`以获取到对应 DOM 节点 | object/string | — | document.body |
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| body | 同 `v-loading` 指令中的 `body` 修饰符 | boolean | — | false |
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| fullscreen | 同 `v-loading` 指令中的 `fullscreen` 修饰符 | boolean | — | true |
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| lock | 同 `v-loading` 指令中的 `lock` 修饰符 | boolean | — | false |
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| text | 显示在加载图标下方的加载文案 | string | — | — |
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| spinner | 自定义加载图标类名 | string | — | — |
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| background | 遮罩背景色 | string | — | — |
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| customClass | Loading 的自定义类名 | string | — | — |
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