没有使用Context的情况下传递数据,我们可以参考React的文档: Context,它是通过组件属性一级一级往下传递. 这种方式很麻烦,如果组件树比较深,必须在每一个路径上的节点都引入不必要的属性.

定义 Context 的根组件

import React      from 'react';

# React 15.5版本以后,使用PropTypes需要引入外部库,直接使用React.PropTypes 会抛警告
import PropTypes from 'prop-types';

# React Router V4版本要从 react-router-dom 导入需要的组件
import { Route,Link } from 'react-router-dom';

import { Row,Col,Menu,Icon,Dropdown,Layout} from 'antd';
const { Sider,Content } = Layout;

import UserList   from './UserList';
import UserDetail from './UserDetail';
import Sidebar    from '../_layouts/Sidebar';

const avatars = [
  "elyse.png","kristy.png","matthew.png",];

const data = [];
for(let i = 0; i <= avatars.length; i++){
  data.push({key: i,name: '胡彦祖3',age: 42,address: '西湖区湖底公园1号'});
}

const columns = [
  { title: 'ID',dataIndex: 'key',key: 'key'},{ title: '姓名',dataIndex: 'name',key: 'name',render: function(text,record,index) {
    return (<Link to={`/users/${index}`}><div style={{display: 'block'}}>{text}</div></Link>)
  }},{ title: '年龄',dataIndex: 'age',key: 'age'},{ title: '住址',dataIndex: 'address',key: 'address'},{
    title: 'Action',key: 'action',index){
      return (
        <span>
          <a><Icon type="plus" /></a>
          <span className="ant-divider" />
          <a><Icon type="close" /></a>
        </span>
      )
    }
  }
];

class UserIndex extends React.Component {
  constructor(props){
    super(props)
  }

  # 定义Context需要实现的方法

  getChildContext() {
    return {
      data: data,columns: columns
    };
  }
  render(){
    return (
      <Layout>
        <Sider>
          <div id="user-side-bar" className="side-bar">
          <Sidebar/>
          </div>
        </Sider>
        <Content>
          <h2 className="pagetitle">用户信息页</h2>
          <Row gutter={16}>
            <Col span={16}>
              <UserList />
            </Col>
            <Col span={4}>
              <Route path={`${this.props.match.url}/:id`} component={UserDetail}/>
            </Col>
          </Row>
        </Content>
      </Layout>
    )
  }
}

# 声明Context类型

UserIndex.childContextTypes = {
  data: PropTypes.array,columns: PropTypes.array,};

export default UserIndex;

中间组件

中间中间不再通过组件属性一级一级的往下传递了. 我们这里在 render() 函数中定义一个空的 <List/>:

import React from 'react';
import PropTypes from 'prop-types';

import { Table,Icon } from 'antd';

import {
  Link
} from 'react-router-dom';

import List from '../_common/List';



class UserList extends React.Component {
  constructor(props){
    super(props)
  }
  render(){
    return (
      <div>
        <List />
      </div>
    )
  }
}

export default UserList;

子组件,列表

import React from 'react';
import PropTypes from 'prop-types';
import { Layout,Table } from 'antd';
const { Sider,Content } = Layout;
class List extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
    return (
      <Content>
        <Table columns={this.context.columns} dataSource={this.context.data} size="middle" />
      </Content>
    );
  }
}

List.propTypes = {
    data: PropTypes.array,columns: PropTypes.array
};

# 在这里声明 contextTypes 用于访问 UserIndex 组件中定义的Context数据.

List.contextTypes = {
  data: PropTypes.array,columns: PropTypes.array
};

export default List;