Dropdown下拉菜单

向下弹出的列表。

何时使用#

当页面上的操作命令过多时，用此组件可以收纳操作元素。点击或移入触点，会出现一个下拉菜单。可在列表中进行选择，并执行相应的命令。

用于收罗一组命令操作。
Select 用于选择，而 Dropdown 是命令集合。

代码演示

基本

最简单的下拉菜单。

import { Menu, Dropdown } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item icon={<DownOutlined />} disabled>
      <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
        2nd menu item (disabled)
      </a>
    </Menu.Item>
    <Menu.Item disabled>
      <a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
        3rd menu item (disabled)
      </a>
    </Menu.Item>
    <Menu.Item danger>a danger item</Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
      Hover me <DownOutlined />
    </a>
  </Dropdown>,
  mountNode,
);

箭头

可以展示一个箭头。

import { Menu, Dropdown, Button } from 'sld';

const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
        2nd menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
        3rd menu item
      </a>
    </Menu.Item>
  </Menu>
);

ReactDOM.render(
  <>
    <Dropdown overlay={menu} placement="bottomLeft" arrow>
      <Button>bottomLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottom" arrow>
      <Button>bottom</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottomRight" arrow>
      <Button>bottomRight</Button>
    </Dropdown>
    <br />
    <Dropdown overlay={menu} placement="topLeft" arrow>
      <Button>topLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="top" arrow>
      <Button>top</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="topRight" arrow>
      <Button>topRight</Button>
    </Dropdown>
  </>,
  mountNode,
);
#components-dropdown-demo-arrow .ant-btn {
  margin-right: 8px;
  margin-bottom: 8px;
}
.ant-row-rtl #components-dropdown-demo-arrow .ant-btn {
  margin-right: 0;
  margin-bottom: 8px;
  margin-left: 8px;
}

箭头指向

设置 arrow 为 { pointAtCenter: true } 后，箭头将指向目标元素的中心。

import { Menu, Dropdown, Button } from 'sld';

const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
        2nd menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
        3rd menu item
      </a>
    </Menu.Item>
  </Menu>
);

ReactDOM.render(
  <>
    <Dropdown overlay={menu} placement="bottomLeft" arrow={{ pointAtCenter: true }}>
      <Button>bottomLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottom" arrow={{ pointAtCenter: true }}>
      <Button>bottom</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottomRight" arrow={{ pointAtCenter: true }}>
      <Button>bottomRight</Button>
    </Dropdown>
    <br />
    <Dropdown overlay={menu} placement="topLeft" arrow={{ pointAtCenter: true }}>
      <Button>topLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="top" arrow={{ pointAtCenter: true }}>
      <Button>top</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="topRight" arrow={{ pointAtCenter: true }}>
      <Button>topRight</Button>
    </Dropdown>
  </>,
  mountNode,
);
#components-dropdown-demo-arrow-center .ant-btn {
  margin-right: 8px;
  margin-bottom: 8px;
}
.ant-row-rtl #components-dropdown-demo-arrow-center .ant-btn {
  margin-right: 0;
  margin-bottom: 8px;
  margin-left: 8px;
}

触发事件

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。

import { Menu, Dropdown, message } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const onClick = ({ key }) => {
  message.info(`Click on item ${key}`);
};

const menu = (
  <Menu onClick={onClick}>
    <Menu.Item key="1">1st menu item</Menu.Item>
    <Menu.Item key="2">2nd menu item</Menu.Item>
    <Menu.Item key="3">3rd menu item</Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
      Hover me, Click menu item <DownOutlined />
    </a>
  </Dropdown>,
  mountNode,
);

多级菜单

传入的菜单里有多个层级。

import { Menu, Dropdown } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const { SubMenu } = Menu;

const menu = (
  <Menu>
    <Menu.ItemGroup title="Group title">
      <Menu.Item>1st menu item</Menu.Item>
      <Menu.Item>2nd menu item</Menu.Item>
    </Menu.ItemGroup>
    <SubMenu title="sub menu">
      <Menu.Item>3rd menu item</Menu.Item>
      <Menu.Item>4th menu item</Menu.Item>
    </SubMenu>
    <SubMenu title="disabled sub menu" disabled>
      <Menu.Item>5d menu item</Menu.Item>
      <Menu.Item>6th menu item</Menu.Item>
    </SubMenu>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
      Cascading menu <DownOutlined />
    </a>
  </Dropdown>,
  mountNode,
);

右键菜单

默认是移入触发菜单，可以点击鼠标右键触发。

import { Menu, Dropdown } from 'sld';

const menu = (
  <Menu>
    <Menu.Item key="1">1st menu item</Menu.Item>
    <Menu.Item key="2">2nd menu item</Menu.Item>
    <Menu.Item key="3">3rd menu item</Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu} trigger={['contextMenu']}>
    <div
      className="site-dropdown-context-menu"
      style={{
        textAlign: 'center',
        height: 200,
        lineHeight: '200px',
      }}
    >
      Right Click on here
    </div>
  </Dropdown>,
  mountNode,
);
.site-dropdown-context-menu {
  color: #777;
  background: #f7f7f7;
}

弹出位置

支持 6 个弹出位置。

import { Menu, Dropdown, Button, Space } from 'sld';

const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
        2nd menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
        3rd menu item
      </a>
    </Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Space direction="vertical">
    <Space wrap>
      <Dropdown overlay={menu} placement="bottomLeft">
        <Button>bottomLeft</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="bottom">
        <Button>bottom</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="bottomRight">
        <Button>bottomRight</Button>
      </Dropdown>
    </Space>
    <Space wrap>
      <Dropdown overlay={menu} placement="topLeft">
        <Button>topLeft</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="top">
        <Button>top</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="topRight">
        <Button>topRight</Button>
      </Dropdown>
    </Space>
  </Space>,
  mountNode,
);

其他元素

分割线和不可用菜单项。

import { Menu, Dropdown } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const menu = (
  <Menu>
    <Menu.Item key="0">
      <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item key="1">
      <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
        2nd menu item
      </a>
    </Menu.Item>
    <Menu.Divider />
    <Menu.Item key="3" disabled>
      3rd menu item（disabled）
    </Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
      Hover me <DownOutlined />
    </a>
  </Dropdown>,
  mountNode,
);

触发方式

默认是移入触发菜单，可以点击触发。

import { Menu, Dropdown } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const menu = (
  <Menu>
    <Menu.Item key="0">
      <a href="https://www.antgroup.com">1st menu item</a>
    </Menu.Item>
    <Menu.Item key="1">
      <a href="https://www.aliyun.com">2nd menu item</a>
    </Menu.Item>
    <Menu.Divider />
    <Menu.Item key="3">3rd menu item</Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Dropdown overlay={menu} trigger={['click']}>
    <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
      Click me <DownOutlined />
    </a>
  </Dropdown>,
  mountNode,
);

带下拉框的按钮

左边是按钮，右边是额外的相关功能菜单。可设置 icon 属性来修改右边的图标。

import { Menu, Dropdown, Button, message, Space, Tooltip } from 'sld';
import { DownOutlined, UserOutlined } from '@sld-icon/icons';

function handleButtonClick(e) {
  message.info('Click on left button.');
  console.log('click left button', e);
}

function handleMenuClick(e) {
  message.info('Click on menu item.');
  console.log('click', e);
}

const menu = (
  <Menu onClick={handleMenuClick}>
    <Menu.Item key="1" icon={<UserOutlined />}>
      1st menu item
    </Menu.Item>
    <Menu.Item key="2" icon={<UserOutlined />}>
      2nd menu item
    </Menu.Item>
    <Menu.Item key="3" icon={<UserOutlined />}>
      3rd menu item
    </Menu.Item>
  </Menu>
);

ReactDOM.render(
  <Space wrap>
    <Dropdown.Button onClick={handleButtonClick} overlay={menu}>
      Dropdown
    </Dropdown.Button>
    <Dropdown.Button overlay={menu} placement="bottom" icon={<UserOutlined />}>
      Dropdown
    </Dropdown.Button>
    <Dropdown.Button onClick={handleButtonClick} overlay={menu} disabled>
      Dropdown
    </Dropdown.Button>
    <Dropdown.Button
      overlay={menu}
      buttonsRender={([leftButton, rightButton]) => [
        <Tooltip title="tooltip" key="leftButton">
          {leftButton}
        </Tooltip>,
        React.cloneElement(rightButton, { loading: true }),
      ]}
    >
      With Tooltip
    </Dropdown.Button>
    <Dropdown overlay={menu}>
      <Button>
        Button <DownOutlined />
      </Button>
    </Dropdown>
  </Space>,
  mountNode,
);

菜单隐藏方式

默认是点击关闭菜单，可以关闭此功能。

import { Menu, Dropdown } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

class OverlayVisible extends React.Component {
  state = {
    visible: false,
  };

  handleMenuClick = e => {
    if (e.key === '3') {
      this.setState({ visible: false });
    }
  };

  handleVisibleChange = flag => {
    this.setState({ visible: flag });
  };

  render() {
    const menu = (
      <Menu onClick={this.handleMenuClick}>
        <Menu.Item key="1">Clicking me will not close the menu.</Menu.Item>
        <Menu.Item key="2">Clicking me will not close the menu also.</Menu.Item>
        <Menu.Item key="3">Clicking me will close the menu.</Menu.Item>
      </Menu>
    );
    return (
      <Dropdown
        overlay={menu}
        onVisibleChange={this.handleVisibleChange}
        visible={this.state.visible}
      >
        <a className="ant-dropdown-link" onClick={e => e.preventDefault()}>
          Hover me <DownOutlined />
        </a>
      </Dropdown>
    );
  }
}

ReactDOM.render(<OverlayVisible />, mountNode);

加载中状态

添加 loading 属性即可让按钮处于加载状态，最后两个按钮演示点击后进入加载状态。

import { Menu, Dropdown, Space } from 'sld';
import { DownOutlined } from '@sld-icon/icons';

const menu = (
  <Menu>
    <Menu.Item key="1">Submit and continue</Menu.Item>
  </Menu>
);
class App extends React.Component {
  state = {
    loadings: [],
  };

  enterLoading = index => {
    const newLoadings = [...this.state.loadings];
    newLoadings[index] = true;
    this.setState({
      loadings: newLoadings,
    });
    setTimeout(() => {
      newLoadings[index] = false;
      this.setState({ loadings: newLoadings });
    }, 6000);
  };

  render() {
    const { loadings } = this.state;
    return (
      <Space direction="vertical">
        <Dropdown.Button type="primary" loading overlay={menu}>
          Submit
        </Dropdown.Button>
        <Dropdown.Button type="primary" size="small" loading overlay={menu}>
          Submit
        </Dropdown.Button>
        <Dropdown.Button
          type="primary"
          loading={loadings[0]}
          overlay={menu}
          onClick={() => this.enterLoading(0)}
        >
          Submit
        </Dropdown.Button>
        <Dropdown.Button
          icon={<DownOutlined />}
          loading={loadings[1]}
          overlay={menu}
          onClick={() => this.enterLoading(1)}
        >
          Submit
        </Dropdown.Button>
      </Space>
    );
  }
}
ReactDOM.render(<App />, mountNode);

API#

属性如下

参数	说明	类型	默认值
arrow	下拉框箭头是否显示	boolean \| { pointAtCenter: boolean }	false
disabled	菜单是否禁用	boolean	-
destroyPopupOnHide	关闭后是否销毁 Dropdown	boolean	false
getPopupContainer	菜单渲染父节点。默认渲染到 body 上，如果你遇到菜单滚动定位问题，试试修改为滚动的区域，并相对其定位。	(triggerNode: HTMLElement) => HTMLElement	() => document.body
overlay	菜单	Menu \| () => Menu	-
overlayClassName	下拉根元素的类名称	string	-
overlayStyle	下拉根元素的样式	CSSProperties	-
placement	菜单弹出位置：`bottom` `bottomLeft` `bottomRight` `top` `topLeft` `topRight`	string	`bottomLeft`
trigger	触发下拉的行为, 移动端不支持 hover	Array<`click`\|`hover`\|`contextMenu`>	[`hover`]
visible	菜单是否显示	boolean	-
onVisibleChange	菜单显示状态改变时调用，参数为 `visible`。点击菜单按钮导致的消失不会触发	(visible: boolean) => void	-

overlay 菜单使用 Menu，还包括菜单项 Menu.Item，分割线 Menu.Divider。

注意： Menu.Item 必须设置唯一的 key 属性。
Dropdown 下的 Menu 默认不可选中。如果需要菜单可选中，可以指定 <Menu selectable>。

参数	说明	类型	默认值
buttonsRender	自定义左右两个按钮	(buttons: ReactNode[]) => ReactNode[]	-
loading	设置按钮载入状态	boolean \| { delay: number }	false
disabled	菜单是否禁用	boolean	-
icon	右侧的 icon	ReactNode	-
overlay	菜单	Menu	-
placement	菜单弹出位置：`bottom` `bottomLeft` `bottomRight` `top` `topLeft` `topRight`	string	`bottomLeft`
size	按钮大小，和 Button 一致	string	`default`
trigger	触发下拉的行为	Array<`click`\|`hover`\|`contextMenu`>	[`hover`]
type	按钮类型，和 Button 一致	string	`default`
visible	菜单是否显示	boolean	-
onClick	点击左侧按钮的回调，和 Button 一致	(event) => void	-
onVisibleChange	菜单显示状态改变时调用，参数为 `visible`	(visible: boolean) => void	-

基本
弹出位置
箭头
其他元素
箭头指向
触发方式
触发事件
带下拉框的按钮
多级菜单
菜单隐藏方式
右键菜单
加载中状态
API

Dropdown下拉菜单

何时使用#

代码演示

API#

Dropdown.Button#