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。

代码演示

基本

最简单的下拉菜单。

import { Menu, Dropdown, Icon, Button } from 'choerodon-ui/pro';
const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">1st menu item</a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">2nd menu item</a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">3rd menu item</a>
    </Menu.Item>
  </Menu>
);
ReactDOM.render(
  <div>
    <Dropdown overlay={menu}>
      <Button>
        Click me <Icon type="arrow_drop_down" />
      </Button>
    </Dropdown>
  </div>,
  mountNode);

其他元素

分割线和不可用菜单项。

import { Menu, Dropdown, Icon, Button } from 'choerodon-ui/pro';
const menu = (
  <Menu>
    <Menu.Item key="0">
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">1st menu item</a>
    </Menu.Item>
    <Menu.Item key="1">
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">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}>
    <Button>
      Click me <Icon type="arrow_drop_down" />
    </Button>
  </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, Button } from 'choerodon-ui/pro';
const onClick = function ({ 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}>
    <Button>
      Click me, Click menu item <Icon type="arrow_drop_down" />
    </Button>
  </Dropdown>,
  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, Button } from 'choerodon-ui/pro';
class OverlayVisible extends React.Component {
  state = {
    hidden: true,
    disabled: true,
  };
  handleMenuClick = (e) => {
    if (e.key === '3') {
      this.setState({ hidden: true });
    }
    if (e.key === '1') {
      this.setState({ disabled: false });
    }
  }
  handleToggleDropdown = () => {
    this.setState({ hidden: !this.state.hidden });
  }
  render() {
    const menu = (
      <Menu onClick={this.handleMenuClick}>
        <Menu.Item key="1">Clicking me will not close the menu.</Menu.Item>
        <Menu.Item key="2" disabled={this.state.disabled}>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}
        hidden={this.state.hidden}
      >
        <Button onClick={this.handleToggleDropdown}>
          Click me <Icon type="arrow_drop_down" />
        </Button>
      </Dropdown>
    );
  }
}
ReactDOM.render(<OverlayVisible />, mountNode);

弹出位置

支持 6 个弹出位置。

import { Menu, Dropdown, Button } from 'choerodon-ui/pro';
const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">1st menu item</a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">2nd menu item</a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer" href="https://choerodon.io">3rd menu item</a>
    </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);

#components-dropdown-demo-placement .c7n-pro-btn {
  margin-right: 8px;
  margin-bottom: 8px;
}

触发方式

默认是点击触发菜单，可以移入触发。

import { Menu, Dropdown, Icon, Button } from 'choerodon-ui/pro';
const menu = (
  <Menu>
    <Menu.Item key="0">
      <a href="https://choerodon.io">1st menu item</a>
    </Menu.Item>
    <Menu.Item key="1">
      <a href="https://choerodon.io">2nd menu item</a>
    </Menu.Item>
    <Menu.Divider key="d" />
    <Menu.Item key="2">3rd menu item</Menu.Item>
  </Menu>
);
ReactDOM.render(
  <div>
    <Dropdown overlay={menu} trigger={['hover']}>
      <Button>
        Hover me <Icon type="arrow_drop_down" />
      </Button>
    </Dropdown>
  </div>,
  mountNode);

多级菜单

传入的菜单里有多个层级。

import { Menu, Dropdown, Icon, Button } from 'choerodon-ui/pro';
const SubMenu = Menu.SubMenu;
const menu = (
  <Menu mode="vertical">
    <Menu.Item>1st menu item</Menu.Item>
    <Menu.Item>2nd menu item</Menu.Item>
    <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}>
    <Button>
      Cascading menu <Icon type="arrow_drop_down" />
    </Button>
  </Dropdown>,
  mountNode);

右键菜单

默认是移入触发菜单，可以点击触发。

import { Menu, Dropdown } from 'choerodon-ui/pro';
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);

API

属性如下

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