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element-plus/website/docs/zh-CN/dropdown.md
kooriookami d7341b0fec
feat(dropdown): add max-height prop of menu (#1436) 
* feat(dropdown): add max-height prop of menu

* feat: delete demo
2021-02-08 15:14:01 +08:00

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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。

<el-dropdown>
  <span class="el-dropdown-link">
    下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
  </span>
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</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。

<el-dropdown>
  <el-button type="primary">
    更多菜单<i class="el-icon-arrow-down el-icon--right"></i>
  </el-button>
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</el-dropdown>
<el-dropdown split-button type="primary" @click="handleClick">
  更多菜单
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</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。

<el-row class="block-col-2">
  <el-col :span="8">
    <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>
      <template #dropdown>
        <el-dropdown-menu>
          <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>
      </template>
    </el-dropdown>
  </el-col>
  <el-col :span="8">
    <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>
      <template #dropdown>
        <el-dropdown-menu>
          <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>
      </template>
    </el-dropdown>
  </el-col>
  <el-col :span="8">
    <span class="demonstration">右键(contextmenu) 激活</span>
    <el-dropdown trigger="contextmenu">
      <span class="el-dropdown-link">
        下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
      </span>
      <template #dropdown>
        <el-dropdown-menu>
          <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>
      </template>
    </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。

<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>
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</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

<el-dropdown @command="handleCommand">
  <span class="el-dropdown-link">
    下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
  </span>
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</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。

<el-dropdown split-button type="primary">
  默认尺寸
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</el-dropdown>

<el-dropdown size="medium" split-button type="primary">
  中等尺寸
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</el-dropdown>

<el-dropdown size="small" split-button type="primary">
  小型尺寸
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</el-dropdown>

<el-dropdown size="mini" split-button type="primary">
  超小尺寸
  <template #dropdown>
    <el-dropdown-menu>
      <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>
  </template>
</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 —
max-height 菜单最大高度 string / number — —
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, contextmenu 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 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 — —