reactjs - React 路由器主从 : children component don't render new view until page refresh

Question

我正在创建一个主从导航，就像这里的示例 the react router example ;

我有一个容器组件 OneCheckpointContainer，它呈现一个导航面板 CheckpointNav (链接)和一个数据组件 OneCheckpointData (这个家伙加载时获取数据，并呈现 OneCheckpointView。

当我单击 CheckpointNav 中的链接之一时，除了浏览器中的 URL 发生变化之外，没有任何反应。直到我刷新页面才获取新数据，然后在 subview 中呈现一个新组件。 (也没有错误)

我不确定这个错误是否是因为子组件还负责获取数据以及 View 。

以下是我如何设置路线:

  <Route path="/modules/:id" component={OneCheckpointContainer}>
    <Route path="/modules/:id/checkpoints/:cp_id" component={OneCheckpointData} />
  </Route>

OneCheckpointContainer

import React from 'react';
import CheckpointNav from './CheckpointNav';

class OneCheckpointContainer extends React.Component {
  constructor(props, context) {
    super(props, context);

    this.state = {
      checkpoints: null,
      user: null
    };

  }

  componentWillMount() {
    this.loadCheckpoints();
    this.context.getUser((data) => this.setState({ user: data }));
  }

  loadCheckpoints() {
    $.ajax({
      url: `/api/v1/modules/student/${this.props.params.id}/checkpoints`,
      method: 'GET',
    }).done((data) => {
      this.setState({ checkpoints: data });
    });
  }

  render() {
    return (
      <div>
        <div className="col-xs-3">
          <CheckpointNav mid={this.props.params.id} checkpoints={this.state.checkpoints} />
        </div>
        <div className="col-xs-9">
          { this.props.children || <div>No Children Yet</div>}
        </div>
      </div>
    )
  }
}

OneCheckpointContainer.displayName = OneCheckpointContainer;

OneCheckpointContainer.contextTypes = {
  getUser: React.PropTypes.func.isRequired
};

export default OneCheckpointContainer;

这是CheckpointNav，但我不相信错误就在这里:

import React from 'react';
import NavLink from '../widgets/NavLink';

const CheckpointNav = (props) => {
  const checkpointList = props.checkpoints && props.checkpoints.length > 0 ?
    props.checkpoints.map((item) => {
      return <li key={item.cp._id} className="list-group-item">
      <NavLink className="nav-link" to={"/modules/" + props.mid + "/checkpoints/" + item.cp._id}>
      { item.cp.title}</NavLink></li>
    }) : <div>No CPS</div>;
  return (
    <div className="card one-module-card">
      <div className="card-block modules-card-body">
        <ul className="list-group tags-group">
          { checkpointList }
          <li className="list-group-item new-cp"><NavLink className=""
            to={'/post/checkpoint/' + props.mid}
          >
            New Checkpoint
          </NavLink></li>
        </ul>
      </div>
    </div>
  );

};

export default CheckpointNav;

OneCheckpointData除非刷新，否则不会获取新数据并呈现新数据

import React from 'react';
import CheckpointView from './CheckpointView';

class OneCheckpointData extends React.Component {
  constructor(props, context) {
    super(props, context);

    this.state = {
      checkpoint: null,
      user: null
    };

  }

  componentWillMount() {
    this.loadCheckpoint();
    this.context.getUser((data) => this.setState({ user: data }));
  }

  loadCheckpoint() {
    $.ajax({
      url: `/api/v1/modules/three/cp/${this.props.params.cp_id}`,
      method: 'GET',
    }).done((data) => {
      this.setState({ checkpoint: data });
    });
  }

  render() {
    return this.state.checkpoint ? <CheckpointView user={this.state.user} checkpoint={this.state.checkpoint} /> : null;
  }
}

OneCheckpointData.displayName = OneCheckpointData;

OneCheckpointData.contextTypes = {
  getUser: React.PropTypes.func.isRequired
};

export default OneCheckpointData;

** 我遗漏了 OneCheckpointView，因为它应该是无关的 **

Answer 1

在这种情况下，您可以将 props 作为 loadCheckpoing(props) 函数的参数获取，并且可以在 componentWillReceiveProps 上发送新的 props，如下所示

componentWillMount(this.props) {
  this.loadCheckpoint(this.props);
}

componentWillReceiveProps(nextprops) {
  this.loadCheckpoint(nextprops);
}

loadCheckpoint(props) {
  this.context.getUser((data) => this.setState({ user: data }));
  $.ajax({
    url: `/api/v1/modules/three/cp/${props.params.cp_id}`, //please check i have replace the this.props to props as we have props as a parameter
    method: 'GET',
  }).done((data) => {
    this.setState({ checkpoint: data });
  });
}

我更喜欢使用react-redux或reflux库来处理你的ajax数据查询，但我提出的解决方案应该可以为你完成这项工作。