layui/package/document-component/src/document/zh-CN/components/dropdown.md

::: anchor
:::

::: title 基本介绍
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::: describe 当页面上的操作命令过多时，用此组件可以收纳操作元素。
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::: title 基础使用
:::

::: demo

<template>
  <lay-dropdown>
    <lay-button type="primary">下拉菜单</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {

    return {
    }
  }
}
</script>

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::: title 触发方式
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::: demo

<template>
  <lay-dropdown trigger="hover">
    <lay-button>Hover 触发</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
  &nbsp;&nbsp;
    <lay-dropdown>
    <lay-button>Click 触发</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
    &nbsp;&nbsp;
    <lay-dropdown trigger="contextMenu">
    <lay-button>contextMenu 触发</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
        &nbsp;&nbsp;
    <lay-dropdown trigger="focus">
    <lay-input placeholder="Focus 触发"></lay-input>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
          &nbsp;&nbsp;
    <lay-dropdown :trigger="['hover','focus','click']">
    <lay-input placeholder="hover focus click"></lay-input>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {

    return {
    }
  }
}
</script>
:::

::: title 手动打开或关闭
:::

::: demo

<template>
  <lay-button @click="manualRef.open()">打开</lay-button>
  <lay-button @click="manualRef.hide()">关闭</lay-button>
  <br><br>
  <lay-dropdown ref="manualRef" :clickOutsideToClose="false" :clickToClose="false">
    <lay-button type="primary">下拉菜单</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {
    const manualRef = ref()

    return {
      manualRef,
    }
  }
}
</script>

:::

::: title 默认打开
:::

::: demo

<template>
  <lay-dropdown :visible="true" updateAtScroll>
    <lay-button type="primary">下拉菜单</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {

    return {
    }
  }
}
</script>

:::


::: title 禁用弹出
:::

::: demo

<template>
  <lay-dropdown disabled>
    <lay-button type="primary" >禁用弹出</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {

    return {
    }
  }
}
</script>


:::
::: title 事件处理
:::

::: demo

<template>
  <lay-dropdown @open="stat='开启'" @hide="stat='关闭'">
    <lay-button type="primary" >当前状态:{{stat}}</lay-button>
    <template #content>
        <lay-dropdown-menu>
          <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
          <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
        </lay-dropdown-menu>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {
    const stat=ref("关闭")
    return {
      stat
    }
  }
}
</script>

:::

::: title 弹出位置
:::

::: demo

<template>
  <lay-dropdown placement="top-left">
    <lay-button type="primary">topLeft</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
  &nbsp;&nbsp;
  <lay-dropdown placement="top">
    <lay-button type="primary">top</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
  &nbsp;&nbsp;
  <lay-dropdown placement="top-right">
    <lay-button type="primary">topRight</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
  &nbsp;&nbsp;
  <lay-dropdown placement="bottom-left">
    <lay-button type="primary">bottomLeft</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
    &nbsp;&nbsp;
  <lay-dropdown placement="bottom">
    <lay-button type="primary">bottom</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
    &nbsp;&nbsp;
  <lay-dropdown placement="bottom-right">
    <lay-button type="primary">bottomRight</lay-button>
    <template #content>
      <div style="width:300px;height:200px;"></div> 
    </template>
  </lay-dropdown>
</template>

<script>
import { ref } from 'vue'

export default {
  setup() {

    const btnSize = ref('')
    const toogleSize = () => {
      btnSize.value =  btnSize.value ? '' : 'lg'
    }

    return {
      btnSize,
      toogleSize
    }
  }
}
</script>

:::

::: title 其它属性
:::

::: demo

<template>
   <lay-dropdown placement="bottom-left" autoFitWidth>
    <lay-button type="primary">autoFitWidth</lay-button>
    <template #content>
      <lay-dropdown-menu>
        <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项二1111111111111111111111</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
      </lay-dropdown-menu>
    </template>
  </lay-dropdown>
  &nbsp;&nbsp;
  <lay-dropdown placement="bottom-left" :autoFitMinWidth="false">
    <lay-button type="primary">关闭 autoFitMinWidth</lay-button>
    <template #content>
      <lay-dropdown-menu>
        <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项二111111111</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
      </lay-dropdown-menu> 
    </template>
  </lay-dropdown>
    &nbsp;&nbsp;
  <lay-dropdown placement="bottom-left" updateAtScroll>
    <lay-button type="primary">updateAtScroll</lay-button>
    <template #content>
      <lay-dropdown-menu>
        <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项二111111111</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
      </lay-dropdown-menu> 
    </template>
  </lay-dropdown>
      &nbsp;&nbsp;
  <lay-dropdown placement="bottom-left" updateAtScroll :contentOffset="8">
    <lay-button type="primary">contentOffset: 8px</lay-button>
    <template #content>
      <lay-dropdown-menu>
        <lay-dropdown-menu-item>选项一</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项二</lay-dropdown-menu-item>
        <lay-dropdown-menu-item>选项三</lay-dropdown-menu-item>
      </lay-dropdown-menu> 
    </template>
  </lay-dropdown>
      &nbsp;&nbsp;
      <br><br>
  <lay-button  @click="triggerHeight += 100">改变触发器尺寸</lay-button>
  <lay-button  @click="contentHeight += 100">改变面板尺寸</lay-button>
  <br><br>
  <lay-dropdown placement="bottom-left" trigger="focus" :autoFitPosition="true" :autoFixPosition="true" :blurToClose="false" :clickOutsideToClose="false">
    <lay-input placeholder="autoFixPosition" :style="{height: triggerHeight + 'px'}"></lay-input>
    <template #content>
     <div :style="{width:'350px', height: contentHeight + 'px'}"></div>
    </template>
  </lay-dropdown>
</template>

<script>
import { ref, computed } from 'vue'

export default {
  setup() {

    const btnSize = ref('')
    const toogleSize = () => {
      btnSize.value =  btnSize.value ? '' : 'lg'
    }

    const triggerHeight = ref(100)
    const contentHeight = ref(200)

    return {
      btnSize,
      toogleSize,
      triggerWidth,
      triggerStyle,
    }
  }
}
</script>

:::

::: title Dropdown 属性
:::

::: table

| 属性    | 描述     | 可选值          |
| ------- | -------- | --------------- |
| visible | 下拉面板是否可见 |`true` `false`|
| trigger | 触发方式,类型 `string` 或 trigger 数组  | `click` `hover` `focus` `contextMenu` |
| disabled | 是否禁用触发 | `true` `false` |
| placement | 下拉面板位置 |`top` `top-left` `top-right` `bottom` `bottom-left` `bottom-right`|
| autoFitPosition| 是否自动调整下拉面板位置，默认 `true` |`true` `false` | 
| autoFitWidth | 是否将下拉面板宽度设置为触发器宽度, 默认 `false` |`true` `false` |
| autoFitMinWidth | 是否将下拉面板最小宽度设置为触发器宽度, 默认 `true` |`true` `false` |
| updateAtScroll | 是否在容器滚动时更新下拉面板的位置,默认 `false` | `true` `false` |
| autoFixPosition | 是否在触发器或下拉面板尺寸变化时更新下拉面板位置,<br>面板尺寸变化参见级联选择器,默认 `true` |`true` `false` |
| clickToClose | 是否在点击触发器时关闭面板,默认 `true` |`true` `false`|
| blurToClose | 是否在触发器失去焦点时关闭面板,默认 `true` |`true` `false`|
| clickOutsideToClose| 是否点击外部关闭下拉面板,默认 `true`|`true` `false`|
| contentOffset | 下拉面板距离触发器的偏移距离，默认 2| -| 


:::

::: title Dropdown 插槽
:::

::: table

| 插槽    | 描述     | 可选值 |
| ------- | -------- | ------ |
| content | 下拉内容 | --     |

:::

 
::: title Dropdown 事件
:::

::: table

| 插槽    | 描述     | 参数 |
| ------- | -------- | ------ |
| hide | 隐藏下拉内容后触发 | --     |
| open | 显示下拉内容后触发 | --     |

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::: contributor dropdown
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::: previousNext dropdown
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