Dropdown下拉菜单

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。

基本

最简单的下拉菜单。

分割线和不可用菜单项。

const menu = (
  <Menu>
    <Menu.Item key="0">
      <a target="_blank" rel="noopener noreferrer" href="http://www.alipay.com/">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item key="1">
      <a target="_blank" rel="noopener noreferrer" href="http://www.taobao.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" href="#">
      Hover me <Icon type="down" />
    </a>
  </Dropdown>,
  mountNode,
);

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, Icon, message } from 'antd';
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 memu item</Menu.Item>
    <Menu.Item key="3">3rd menu item</Menu.Item>
  </Menu>
);
ReactDOM.render(
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" href="#">
      Hover me, Click menu item <Icon type="down" />
    </a>
  </Dropdown>,
  mountNode,
);

传入的菜单里有多个层级。

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 'antd';
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']}>
    <span style={{ userSelect: 'none' }}>Right Click on Me</span>
  </Dropdown>,
  mountNode,
);

支持 6 个弹出位置。

import { Menu, Dropdown, Button } from 'antd';
const menu = (
  <Menu>
      <a target="_blank" rel="noopener noreferrer" href="http://www.alipay.com/">
        1st menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="http://www.taobao.com/">
        2nd menu item
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="http://www.tmall.com/">
        3rd menu item
    </Menu.Item>
  </Menu>
);
ReactDOM.render(
  <div>
    <Dropdown overlay={menu} placement="bottomLeft">
      <Button>bottomLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottomCenter">
      <Button>bottomCenter</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="bottomRight">
      <Button>bottomRight</Button>
    </Dropdown>
    <br />
    <Dropdown overlay={menu} placement="topLeft">
      <Button>topLeft</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="topCenter">
      <Button>topCenter</Button>
    </Dropdown>
    <Dropdown overlay={menu} placement="topRight">
      <Button>topRight</Button>
    </Dropdown>
  </div>,
  mountNode,
);

触发方式

import { Menu, Dropdown, Icon } from 'antd';
const menu = (
  <Menu>
    <Menu.Item key="0">
      <a href="http://www.alipay.com/">1st menu item</a>
    </Menu.Item>
    <Menu.Item key="1">
      <a href="http://www.taobao.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" href="#">
      Click me <Icon type="down" />
    </a>
  </Dropdown>,
  mountNode,
);

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, Icon, message } from 'antd';
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 type="user" />
      1st menu item
    </Menu.Item>
    <Menu.Item key="2">
      <Icon type="user" />
      2nd menu item
    </Menu.Item>
    <Menu.Item key="3">
      <Icon type="user" />
      3rd item
    </Menu.Item>
  </Menu>
);
ReactDOM.render(
  <div id="components-dropdown-demo-dropdown-button">
      Dropdown
    </Dropdown.Button>
    <Dropdown.Button overlay={menu} icon={<Icon type="user" />}>
      Dropdown
    </Dropdown.Button>
    <Dropdown.Button onClick={handleButtonClick} overlay={menu} disabled>
      Dropdown
    </Dropdown.Button>
    <Dropdown overlay={menu}>
      <Button>
        Button <Icon type="down" />
      </Button>
    </Dropdown>
  </div>,
  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, Icon } from 'antd';
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" href="#">
          Hover me <Icon type="down" />
        </a>
      </Dropdown>
    );
  }
}

属性如下

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