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 React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
弹出位置
支持 6 个弹出位置。
import React from 'react';
import ReactDOM from 'react-dom';
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>
其他元素
分割线和不可用菜单项。
import React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
触发方式
默认是点击触发菜单,可以移入触发。
import React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
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 React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
多级菜单
传入的菜单里有多个层级。
import React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
菜单隐藏方式
默认是点击关闭菜单,可以关闭此功能。
import React from 'react';
import ReactDOM from 'react-dom';
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>
右键菜单
默认是移入触发菜单,可以点击触发。
import React from 'react';
import ReactDOM from 'react-dom';
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>,
document.getElementById('container'));
API
属性如下
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
disabled | 菜单是否禁用 | boolean | |
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。示例 | Function(triggerNode) | () => document.body |
overlay | 菜单 | Menu | |
placement | 菜单弹出位置:bottomLeft | bottomCenter | bottomRight | topLeft | topCenter | topRight | String | bottomLeft |
trigger | 触发下拉的行为 | Array<click |hover |contextMenu > | [‘click’, ‘focus’] |
hidden | 菜单是否隐藏 | boolean | |
onHiddenChange | 菜单显示状态改变时调用,参数为 hidden | Function(hidden) | |
onOverlayClick | 点击菜单时调用,参数为 event | Function(event) |
overlay
菜单使用 Menu,还包括菜单项 Menu.Item
,分割线 Menu.Divider
。
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