在渲染容器之前react redux dispatch action

IT技术 javascript reactjs redux render setstate
2021-05-17 11:52:53

我对 React-redux 应用程序开发非常陌生，我试图了解如何在页面加载后立即调度另一个操作。以下是我的容器代码。我正在使用这个（https://github.com/jpsierens/webpack-react-redux）样板。

let locationSearch;

const ActivationPage = ({activateUser}) => {
    return (
        <div className="container">
          <h2>Activation Required</h2>
          <p>An Activation Email was sent to your email address. Please check your inbox to find the activation link</p>
          { activateUser() }
        </div>
    );
};


ActivationPage.propTypes = {
    activateUser: PropTypes.func
};


const mapStateToProps = (state) => {
    return {
        message: state.message,
        currentUser: state.currentUser,
        request: state.request
    };
};

const mapDispatchToProps = (dispatch) => {
    return {
        activateUser: () => {
            console.log(location);
            if (location.search !== '') {
                locationSearch = querystring.parse(location.search.replace('?', ''));
                console.log(locationSearch);
                if (locationSearch.hasOwnProperty('user_id') && locationSearch.hasOwnProperty('activation_code')) {
                    // change request state to pending to show loader
                    dispatch(actions.requestActions.requestPending());

                }
            }
        }
    };
};

export default connect(
    mapStateToProps,
    mapDispatchToProps
)(ActivationPage);

这段代码给了我警告：setState(…)：在现有状态转换期间无法更新可能是因为我在渲染函数 (IDK) 期间分派了一个动作。如何在页面加载后立即转换给定代码以自动触发 activateUser() 函数。

2个回答

https://facebook.github.io/react/docs/react-component.html

componentWillMount()和componentDidMount()你。我的意见 - 你应该避免使用componentWillMount并且更喜欢componentDidMount- 如果你某个时候将使用服务器渲染，这是有道理的

在我将组件转换为 a classwhich后得到了它的工作extends Component这里的答案帮助我了解了一些概念 如何将 componentDidMount() 与 react-redux connect() 混合？ 以下是那些可能像我一样对此感到困惑的人的实现。

import React, { Component, PropTypes } from 'react';
import { connect } from 'react-redux';
import actions from '../actions';

let locationSearch;

class ActivationPage extends Component {
    constructor(props) {
        super(props);
    }

    componentDidMount() {
        this.props.activateUser();
    }

    render() {
        return (
        <div className="container">
           <h2>Activation Required</h2>
           <p>An Activation Email was sent to your email address. Please check your inbox to find the activation link</p>
        </div>
        );
    }
}

ActivationPage.propTypes = {
    activateUser: PropTypes.func
};

const mapStateToProps = (state) => {
    return {
        request: state.request
    };
};

const mapDispatchToProps = (dispatch) => {
    return {
        activateUser: () => {
            if (location.search !== '') {
                locationSearch = querystring.parse(location.search.replace('?', ''));
                if (locationSearch.hasOwnProperty('user_id') && locationSearch.hasOwnProperty('activation_code')) {
                    // change request state to pending to show loader
                    dispatch(actions.requestActions.requestPending());
                }
             }
        }
    };
};

export default connect(
    mapStateToProps,
    mapDispatchToProps
)(ActivationPage);
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