javascript - redux saga 和 history.push

Question

背景:
我正在创建一个 Login 组件。

saga.js 由 3 个函数组成
1. rootSaga。它将执行sagas里面的列表
2. watchSubmitBtn。它会观察提交按钮的点击并发送一个 Action 。
3. shootApiTokenAuth 会接收派发的action 并处理axios.post 返回值为promise 对象

在行动:
后端返回 400 给 React。这种情况没问题，我可以轻松读取 payload 并在 render() 中显示。但是当返回 200 时。 我需要让用户转到 url /companies。

尝试:
我曾尝试将 this.props.history.push('/companies'); 放在 componentWillUpdate() 中，但它不起作用。我必须点击 Submit 两次才能让 React 知道 token 已保存。

登录.js

import React, {Component} from 'react';
import ErrorMessage from "../ErrorMessage";
import {Field, reduxForm} from 'redux-form';
import {connect} from 'react-redux';
import {validate} from '../validate';
import {SUBMIT_USERNAME_PASSWORD} from "../../constants";

class Login extends Component {

  constructor(props) {
    //Login is stateful component, but finally action will change
    //reducer state
    super(props);
    const token = localStorage.getItem('token');
    const isAuthenticated = !((token === undefined) | (token === null));
    this.state = {
      token,
      isAuthenticated,
      message: null,
      statusCode: null
    };
  }

  onSubmit(values) {
    const {userid, password} = values;
    const data = {
      username: userid,
      password
    };
    this.props.onSubmitClick(data);
  }

  componentWillUpdate(){
    console.log('componentWillUpdate');
    if(this.props.isAuthenticated){
      this.props.history.push('/companies');
    }
  }

  renderField(field) {
    const {meta: {touched, error}} = field;
    const className = `'form-group' ${touched && error ? 'has-danger' : ''}`;

    console.log('renderField');

    return (
      <div className={className}>
        <label>{field.label}</label>
        <input
          className="form-control"
          type={field.type}
          placeholder={field.placeholder}
          {...field.input}
        />
        <div className="text-help">
          {touched ? error : ''}
        </div>
      </div>
    );
  }

  render() {
    const {handleSubmit} = this.props;

    return (
      <div>
        <ErrorMessage
          isAuthenticated={this.props.isAuthenticated}
          message={this.props.message}
        />

        <form onSubmit={handleSubmit(this.onSubmit.bind(this))}>
          <Field
            name="userid"
            component={this.renderField}
            placeholder="User ID"
            type="text"
          />
          <Field
            name="password"
            component={this.renderField}
            placeholder="Password"
            type="password"
          />
          <button type="submit" className="btn btn-primary">Submit</button>
        </form>
        <a className='btn btn-primary' href="https://www.magicboxasia.com/">Sign up</a>
      </div>
    );
  }
}


const onSubmitClick = ({username, password}) => {
  return {
    type: SUBMIT_USERNAME_PASSWORD,
    payload: {username, password}
  };
};

const mapStateToProps = (state, ownProps) => {
  return {
    ...state.login
  }
};

export default reduxForm({
  validate,
  form: 'LoginForm'
})(
  connect(mapStateToProps, {onSubmitClick})(Login)
);

传奇.ja

const shootApiTokenAuth = (values) =>{
  const {username, password} = values;
  return axios.post(`${ROOT_URL}/api-token-auth/`,
    {username, password});
};

function* shootAPI(action){
  try{
    const res = yield call(shootApiTokenAuth, action.payload);
    yield put({
      type: REQUEST_SUCCESS,
      payload: res
    });
  }catch(err){
    yield put({
      type: REQUEST_FAILED,
      payload: err
    });
  }
}

function * watchSubmitBtn(){
  yield takeEvery(SUBMIT_USERNAME_PASSWORD, shootAPI);
}

// single entry point to start all Sagas at once
export default function* rootSaga() {
  yield all([
    watchSubmitBtn()
  ])
}

问题:
如何设置组件状态并将 push 发送到 url /companies？在后端返回 200 之后？

Answer 1

我通常像传奇中那样处理条件导航。

现有代码的最简单答案是在 SUBMIT_USERNAME_PASSWORD 操作中将历史对象作为 Prop 传递，并在传奇成功案例中调用 history.push()，类似于:

const onSubmitClick = ({username, password}) => {
  const { history } = this.props;

  return {
    type: SUBMIT_USERNAME_PASSWORD,
    payload: {username, password, history}
  };
};

.......

function* shootAPI(action){
  try{
    const res = yield call(shootApiTokenAuth, action.payload);
    const { history } = action.payload;

    yield put({
      type: REQUEST_SUCCESS,
      payload: res
    });

    history.push('/companies');
  }catch(err){
    yield put({
      type: REQUEST_FAILED,
      payload: err
    });
  }
}