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304 lines
9.0 KiB
Markdown
304 lines
9.0 KiB
Markdown
## Drawer 抽屉
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有些时候, `Dialog` 组件并不满足我们的需求, 比如你的表单很长, 亦或是你需要临时展示一些文档, `Drawer` 拥有和 `Dialog` 几乎相同的 API, 在 UI 上带来不一样的体验.
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:::tip
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因为 Vue 提供了 `v-model` 的原生支持，所以以前的 `visible.sync` 已经不再适用，请使用 `v-model="visibleBinding"` 的表达式来绑定是否显示抽屉组件
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:::
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### 基本用法
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呼出一个临时的侧边栏, 可以从多个方向呼出
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:::demo 需要设置 `model-value` 属性，它的**类型**是 `boolean`,当为 **true** 时显示 Drawer。Drawer 分为两个部分：`title` 和 `body`，`title` 需要具名为 **title** 的 `slot`, 也可以通过 `title` 属性来定义，默认值为空。需要注意的是, Drawer 默认是从右往左打开, 当然可以设置对应的 `direction`, 详细请参考 `direction` 用法 最后，本例还展示了 `before-close` 的用法
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```html
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<el-radio-group v-model="direction">
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<el-radio label="ltr">从左往右开</el-radio>
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<el-radio label="rtl">从右往左开</el-radio>
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<el-radio label="ttb">从上往下开</el-radio>
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<el-radio label="btt">从下往上开</el-radio>
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</el-radio-group>
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<el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
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点我打开
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</el-button>
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<el-drawer
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title="我是标题"
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v-model="drawer"
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:direction="direction"
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:before-close="handleClose" destroy-on-close>
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<span>我来啦!</span>
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</el-drawer>
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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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drawer: false,
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direction: 'rtl',
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};
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},
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methods: {
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handleClose(done) {
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this.$confirm('确认关闭？')
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.then(_ => {
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done();
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})
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.catch(_ => {});
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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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### 不添加 Title
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当你不需要标题到时候, 你还可以去掉标题
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:::demo 当遇到不需要 title 的场景时, 可以通过 `withHeader` 这个属性来关闭掉 title 的显示, 这样可以留出更大的空间给到用户, 为了用户的可访问性, 请务必设定 `title` 的值
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```html
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<el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
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点我打开
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</el-button>
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<el-drawer
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title="我是标题"
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v-model="drawer"
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:with-header="false">
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<span>我来啦!</span>
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</el-drawer>
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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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drawer: false,
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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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### 自定义内容
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和 `Dialog` 组件一样, `Drawer` 同样可以在其内部嵌套各种丰富的操作
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:::demo
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```html
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<el-button type="text" @click="table = true">打开嵌套表格的 Drawer</el-button>
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<el-button type="text" @click="dialog = true">打开嵌套 Form 的 Drawer</el-button>
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<el-drawer
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title="我嵌套了表格!"
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v-model="table"
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direction="rtl"
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size="50%">
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<el-table :data="gridData">
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<el-table-column property="date" label="日期" width="150"></el-table-column>
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<el-table-column property="name" label="姓名" width="200"></el-table-column>
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<el-table-column property="address" label="地址"></el-table-column>
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</el-table>
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</el-drawer>
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<el-drawer
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title="我嵌套了 Form !"
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:before-close="handleClose"
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v-model="dialog"
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direction="ltr"
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custom-class="demo-drawer"
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ref="drawer"
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>
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<div class="demo-drawer__content">
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<el-form :model="form">
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<el-form-item label="活动名称" :label-width="formLabelWidth">
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<el-input v-model="form.name" autocomplete="off"></el-input>
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</el-form-item>
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<el-form-item label="活动区域" :label-width="formLabelWidth">
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<el-select v-model="form.region" placeholder="请选择活动区域">
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<el-option label="区域一" value="shanghai"></el-option>
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<el-option label="区域二" value="beijing"></el-option>
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</el-select>
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</el-form-item>
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</el-form>
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<div class="demo-drawer__footer">
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<el-button @click="cancelForm">取 消</el-button>
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<el-button type="primary" @click="$refs.drawer.closeDrawer()" :loading="loading">{{ loading ? '提交中 ...' : '确 定' }}</el-button>
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</div>
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</div>
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</el-drawer>
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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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table: false,
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dialog: false,
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loading: false,
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gridData: [{
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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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date: '2016-05-01',
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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: '2016-05-03',
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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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form: {
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name: '',
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region: '',
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date1: '',
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date2: '',
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delivery: false,
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type: [],
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resource: '',
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desc: ''
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},
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formLabelWidth: '80px',
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timer: null,
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};
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},
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methods: {
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handleClose(done) {
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if (this.loading) {
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return;
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}
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this.$confirm('确定要提交表单吗？')
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.then(_ => {
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this.loading = true;
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this.timer = setTimeout(() => {
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done();
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// 动画关闭需要一定的时间
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setTimeout(() => {
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this.loading = false;
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}, 400);
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}, 2000);
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})
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.catch(_ => {});
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},
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cancelForm() {
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this.loading = false;
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this.dialog = false;
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clearTimeout(this.timer);
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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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### 多层嵌套
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`Drawer` 组件也拥有多层嵌套的方法
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:::demo 同样, 如果你需要嵌套多层 `Drawer` 请一定要设置 `append-to-body` 属性为 **true**
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```html
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<el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
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点我打开
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</el-button>
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<el-drawer
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title="我是外面的 Drawer"
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v-model="drawer"
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size="50%">
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<div>
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<el-button @click="innerDrawer = true">打开里面的!</el-button>
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<el-drawer
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title="我是里面的"
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:append-to-body="true"
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:before-close="handleClose"
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v-model="innerDrawer">
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<p>_(:зゝ∠)_</p>
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</el-drawer>
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</div>
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</el-drawer>
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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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drawer: false,
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innerDrawer: false,
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};
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},
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methods: {
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handleClose(done) {
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this.$confirm('还有未保存的工作哦确定关闭吗？')
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.then(_ => {
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done();
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})
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.catch(_ => {});
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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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:::tip
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Drawer 的内容是懒渲染的，即在第一次被打开之前，传入的默认 slot 不会被渲染到 DOM 上。因此，如果需要执行 DOM 操作，或通过 `ref` 获取相应组件，请在 `open` 事件回调中进行。
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:::
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:::tip
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Drawer 提供一个 `destroyOnClose` API, 用来在关闭 Drawer 时销毁子组件内容, 例如清理表单内的状态, 在必要时可以将该属性设置为 **true** 用来保证初始状态的一致性
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:::
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### Drawer Attributes
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Drawer has almost identical attributes as Dialog.
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------------- |---------- |-------------------------------- |-------- |
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| append-to-body | Drawer 自身是否插入至 body 元素上。嵌套的 Drawer 必须指定该属性并赋值为 true | boolean | — | false |
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| before-close | 关闭前的回调，会暂停 Drawer 的关闭 | function(done)，done 用于关闭 Drawer | — | — |
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| close-on-press-escape | 是否可以通过按下 ESC 关闭 Drawer | boolean | — | true |
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| custom-class | Drawer 的自定义类名 | string | — | — |
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| destroy-on-close | 控制是否在关闭 Drawer 之后将子元素全部销毁 | boolean | - | false |
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| modal | 是否需要遮罩层 | boolean | — | true |
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| direction | Drawer 打开的方向 | Direction | rtl / ltr / ttb / btt | rtl |
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| show-close | 是否显示关闭按钮 | boolean | — | true |
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| size | Drawer 窗体的大小, 当使用 `number` 类型时, 以像素为单位, 当使用 `string` 类型时, 请传入 'x%', 否则便会以 `number` 类型解释 | number / string | - | '30%' |
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| title | Drawer 的标题，也可通过具名 slot （见下表）传入 | string | — | — |
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| model-value / v-model | 是否显示 Drawer | boolean | — | false |
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| withHeader | 控制是否显示 header 栏, 默认为 true, 当此项为 false 时, title attribute 和 title slot 均不生效 | boolean | - | true |
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### Drawer Slot
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| name | 说明 |
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|------|--------|
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| — | Drawer 的内容 |
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| title | Drawer 标题区的内容 |
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### Drawer Methods
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| name | 说明 |
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| ---- | --- |
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| handleClose | 用于关闭 Drawer, 该方法会调用传入的 `before-close` 方法 |
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### Drawer Events
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| 事件名称 | 说明 | 回调参数 |
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|---------- |-------- |---------- |
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| open | Drawer 打开的回调 | — |
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| opened | Drawer 打开动画结束时的回调 | — |
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| close | Drawer 关闭的回调 | — |
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| closed | Drawer 关闭动画结束时的回调 | — |
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