React Router master-detail:子组件在页面刷新之前不呈现新视图

Question

我正在创建一个主 - 细节导航,就像这里的示例反应路由器示例 ;

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(这个人在加载时获取数据,并呈现OneCheckpointView.

当我单击其中一个链接CheckpointNav时,除了浏览器中的URL发生更改外,没有任何反应.直到我刷新页面才会获取新数据,然后在子视图中呈现新组件.(也没有错误)

我不确定这个错误是否因为子组件还负责获取数据以及视图.

以下是我设置路线的方法:

  <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虽然我不相信这里的错误:

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;

除非我刷新,否则OneCheckpointData 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,因为它应该是无关紧要的**

Answer 1

在那种情况下,您可以将道具作为loadCheckpoing(props)函数的参数,您可以在componentWillReceiveProps下面 发送新的道具

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 });
  });
}

我更愿意使用react-redux或回流库来处理你的ajax数据查询,但我建议的解决方案应该为你完成这项工作.