Question

Backgrond：
我正在创建一个Login组件。

saga.js由3个函数组成 1. rootSaga。它将执行内部sagas的列表 2. watchSubmitBtn。它将观察提交按钮上的点击并发送一个动作 3. shootApiTokenAuth将收到已发送的action和流程axios.post，返回值为promise对象

在行动中：
后端将400返回React。这种情况没问题我可以阅读payload并轻松地在render()中显示。但是当返回200时。我需要让用户转到网址/companies。

尝试：
我曾尝试将this.props.history.push('/companies');放入componentWillUpdate()，但它不起作用。我必须点击Submit 2次才能让React了解token已保存。

Login.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)
);

saga.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设置为url /companies？后端返回200后？

Answer 1

我通常会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saga的成功案例中执行history.push（）调用，如：

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
    });
  }
}

Answer 2

React有额外的生命周期。我今天才知道。他们中有很多人。

componentDidUpdate() {
    this.props.history.push('/companies');
  }

Answer 3

我的反应经验不足，但是您可以通过以下方式实现它：

1。创建一个新模块： history-wrapper.ts

export class HistoryWrapper {
  static history;
  static init(history){
    HistoryWrapper.history = history;
  }
}

2。在您内 login.jsx

  HistoryWrapper.init(history);//initialize history in HistoryWrapper

3。随后在您应用中的任何地方

  HistoryWrapper.history.push('/whatever');

Answer 4

yield put(push('/path-to-go'));

解决了我的问题

redux saga and history.push

4 个答案: