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element-ui/examples/docs/zh-CN/dropdown.md

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2021-06-07 11:56:04 +08:00
## Dropdown 下拉菜单
将动作或菜单折叠到下拉菜单中。
### 基础用法
移动到下拉菜单上，展开更多操作。
:::demo 通过组件`slot`来设置下拉触发的元素以及需要通过具名`slot`为`dropdown` 来设置下拉菜单。默认情况下，下拉按钮只要`hover`即可，无需点击也会显示下拉菜单。
```html
<el-dropdown>
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item disabled>双皮奶</el-dropdown-item>
<el-dropdown-item divided>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<style>
.el-dropdown-link {
cursor: pointer;
color: #409EFF;
}
.el-icon-arrow-down {
font-size: 12px;
}
</style>
```
:::
### 触发对象
可使用按钮触发下拉菜单。
:::demo 设置`split-button`属性来让触发下拉元素呈现为按钮组，左边是功能按钮，右边是触发下拉菜单的按钮，设置为`true`即可。
```html
<el-dropdown>
<el-button type="primary">
更多菜单<i class="el-icon-arrow-down el-icon--right"></i>
</el-button>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<el-dropdown split-button type="primary" @click="handleClick">
更多菜单
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<style>
.el-dropdown {
vertical-align: top;
}
.el-dropdown + .el-dropdown {
margin-left: 15px;
}
.el-icon-arrow-down {
font-size: 12px;
}
</style>
<script>
export default {
methods: {
handleClick() {
alert('button click');
}
}
}
</script>
```
:::
### 触发方式
可以配置 click 激活或者 hover 激活。
:::demo 在`trigger`属性设置为`click`即可。
```html
<el-row class="block-col-2">
<el-col :span="12">
<span class="demonstration">hover 激活</span>
<el-dropdown>
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item icon="el-icon-plus">黄金糕</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-plus">狮子头</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-plus-outline">螺蛳粉</el-dropdown-item>
<el-dropdown-item icon="el-icon-check">双皮奶</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-check">蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
</el-col>
<el-col :span="12">
<span class="demonstration">click 激活</span>
<el-dropdown trigger="click">
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item icon="el-icon-plus">黄金糕</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-plus">狮子头</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-plus-outline">螺蛳粉</el-dropdown-item>
<el-dropdown-item icon="el-icon-check">双皮奶</el-dropdown-item>
<el-dropdown-item icon="el-icon-circle-check">蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
</el-col>
</el-row>
<style>
.el-dropdown-link {
cursor: pointer;
color: #409EFF;
}
.el-icon-arrow-down {
font-size: 12px;
}
.demonstration {
display: block;
color: #8492a6;
font-size: 14px;
margin-bottom: 20px;
}
</style>
```
:::
### 菜单隐藏方式
可以`hide-on-click`属性来配置。
:::demo 下拉菜单默认在点击菜单项后会被隐藏，将`hide-on-click`属性默认为`false`可以关闭此功能。
```html
<el-dropdown :hide-on-click="false">
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item disabled>双皮奶</el-dropdown-item>
<el-dropdown-item divided>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<style>
.el-dropdown-link {
cursor: pointer;
color: #409EFF;
}
.el-icon-arrow-down {
font-size: 12px;
}
</style>
```
:::
### 指令事件
点击菜单项后会触发事件，用户可以通过相应的菜单项 key 进行不同的操作
:::demo
```html
<el-dropdown @command="handleCommand">
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item command="a">黄金糕</el-dropdown-item>
<el-dropdown-item command="b">狮子头</el-dropdown-item>
<el-dropdown-item command="c">螺蛳粉</el-dropdown-item>
<el-dropdown-item command="d" disabled>双皮奶</el-dropdown-item>
<el-dropdown-item command="e" divided>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<style>
.el-dropdown-link {
cursor: pointer;
color: #409EFF;
}
.el-icon-arrow-down {
font-size: 12px;
}
</style>
<script>
export default {
methods: {
handleCommand(command) {
this.$message('click on item ' + command);
}
}
}
</script>
```
:::
### 不同尺寸
Dropdown 组件提供除了默认值以外的三种尺寸，可以在不同场景下选择合适的尺寸。
:::demo 额外的尺寸：`medium`、`small`、`mini`，通过设置`size`属性来配置它们。
```html
<el-dropdown split-button type="primary">
默认尺寸
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<el-dropdown size="medium" split-button type="primary">
中等尺寸
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<el-dropdown size="small" split-button type="primary">
小型尺寸
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
<el-dropdown size="mini" split-button type="primary">
超小尺寸
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>黄金糕</el-dropdown-item>
<el-dropdown-item>狮子头</el-dropdown-item>
<el-dropdown-item>螺蛳粉</el-dropdown-item>
<el-dropdown-item>双皮奶</el-dropdown-item>
<el-dropdown-item>蚵仔煎</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
```
:::
### Dropdown Attributes
| 参数 | 说明 | 类型 | 可选值 | 默认值 |
|------------- |---------------- |---------------- |---------------------- |-------- |
| type | 菜单按钮类型，同 Button 组件(只在`split-button`为 true 的情况下有效) | string | — | — |
| size | 菜单尺寸，在`split-button`为 true 的情况下也对触发按钮生效 | string | medium / small / mini | — |
| split-button | 下拉触发元素呈现为按钮组 | boolean | — | false |
| placement | 菜单弹出位置 | string | top/top-start/top-end/bottom/bottom-start/bottom-end | bottom-end |
| trigger | 触发下拉的行为 | string | hover, click | hover |
| hide-on-click | 是否在点击菜单项后隐藏菜单 | boolean | — | true |
| show-timeout | 展开下拉菜单的延时（仅在 trigger 为 hover 时有效）| number | — | 250 |
| hide-timeout | 收起下拉菜单的延时（仅在 trigger 为 hover 时有效）| number | — | 150 |
| tabindex | Dropdown 组件的 [tabindex](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex) | number | — | 0 |
### Dropdown Slots
| Name | 说明 |
|------|--------|
| — | 触发下拉列表显示的元素。 注意： 必须是一个元素或者或者组件 |
| dropdown | 下拉列表，通常是 `<el-dropdown-menu>` 组件 |
### Dropdown Events
| 事件名称 | 说明 | 回调参数 |
|---------- |-------- |---------- |
| click | `split-button` 为 true 时，点击左侧按钮的回调 | — |
| command | 点击菜单项触发的事件回调 | dropdown-item 的指令 |
| visible-change | 下拉框出现/隐藏时触发 | 出现则为 true，隐藏则为 false |
### Dropdown Menu Item Attributes
| 参数 | 说明 | 类型 | 可选值 | 默认值 |
|------------- |---------------- |---------------- |---------------------- |-------- |
| command | 指令 | string/number/object | — | — |
| disabled | 禁用 | boolean | — | false |
| divided | 显示分割线 | boolean | — | false |
| icon | 图标类名 | string | — | — |
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