Question

我有这种搜索方法，我希望在搜索后重定向用户。问题是它没有做任何事情，我不知道为什么。 this.props.history是已定义但对象“history”的“location”属性似乎没有根据我在push方法（'./connexion'）的参数中的设置而改变... URL不改变。搜索方法是绑定的，我使用export default withRouter(SearchBar);通过道具访问历史记录。知道我在其他文件中使用完全相同的东西（this.props.history.push（）和withRouter）并且它正常工作......我将"react-router-dom": "^4.1.1"与browserHistory一起使用。

search(event) {
if (this.state.location === null) {
    this.setState({ geosuggestId: 'geosuggest-input-alert' });
} else if (this.state.subjects.length === 0) {
    this.setState({ matieresButtonId: 'matieres-button-alert' });
} else {
    console.log(this.props.parent);
    if (this.props.parent === 'Homepage') {
        console.log(this.props.history);
        this.props.history.push('/connexion');
    }
}
}

完整档案：

import React, { Component } from 'react';
import { Field, reduxForm } from 'redux-form';
import { Link } from 'react-router-dom';
import { connect } from 'react-redux';
import Geosuggest from 'react-geosuggest';
import SearchBySubjectsModal from './modals/search_by_subjects_modal';
import { withRouter } from 'react-router-dom';

/**
 * Search bar for parent to search for profs
 */
class SearchBar extends Component {

constructor(props) {

super(props);

this.state = {
    location: null,
    subjects: [],
    level: 'Collège',
    matieresButtonId: 'matieres-button',
    geosuggestId: 'geosuggest-input'
}

this.onSuggestSelect = this.onSuggestSelect.bind(this);
this.setSubjects = this.setSubjects.bind(this);
this.search = this.search.bind(this);
}

/**
 * if the state for subjects and location is not null, then stop     fields warning
 */
componentDidUpdate() {
if (this.state.subjects.length > 0) {
    if (this.state.matieresButtonId !== 'matieres-button')
        this.setState({ matieresButtonId: 'matieres-button' });
}
if (this.state.location !== null) {
    if (this.state.geosuggestId !== 'geosuggest-input')
        this.setState({ geosuggestId: 'geosuggest-input' });
}
}

/**
 * set the state when choosing a location
 * @param {*} suggest 
 */
onSuggestSelect(suggest) {
this.setState({ location: suggest });
}

/**
 * set the state when choosing subjects
 * @param {*} suggest 
 */
setSubjects(subjects, level) {
this.setState({ subjects, level });
}

/**
 * Search method
 * Check if subjects or location are null (is so, show warnings)
 * If no warnings, perform search and redirect to search page
 * @param {*} event 
 */
search(event) {
if (this.state.location === null) {
    this.setState({ geosuggestId: 'geosuggest-input-alert' });
} else if (this.state.subjects.length === 0) {
    this.setState({ matieresButtonId: 'matieres-button-alert' });
} else {
    console.log(this.props.parent);
    if (this.props.parent === 'Homepage') {
        console.log(this.props.history);
        this.props.history.push('/connexion');
    }
}
}

/**
 * Uses GeoSuggest (google places api) to choose a town
 * Uses Search By Subject modal to choose subjects
 */
render() {
return (
    <div className="container" id="search-bar" >
        <div className="text-center">
            <form action="">
                <div className="row">
                    <div className="col">
                        <Geosuggest
                            queryDelay={150}
                            autoActivateFirstSuggest={true}
                            inputClassName={this.state.geosuggestId}
                            placeholder="Où ?"
                            country="fr"
                            onSuggestSelect={this.onSuggestSelect} />
                    </div>
                    <div className="col">
                        <Link to="/">
                            <button data-toggle="modal" data-target=".choose-subject-modal" className="btn clickable" id={this.state.matieresButtonId}>
                                <i className="fa fa-graduation-cap"></i>  Matières ?
                            </button>
                        </Link>
                    </div>
                    <div className="col">
                        <Link to="/">
                            <button type="submit" className="btn clickable" id="search-button" onClick={this.search}>
                                <h5 id="search-btn-txt"><i className="fa fa-search"></i>  Trouver</h5>
                            </button>
                        </Link>
                    </div>
                </div>
            </form>
            <SearchBySubjectsModal search={this.search} location={this.state.location} setSubjects={this.setSubjects} />
        </div>
    </div>
);
};
}





export default withRouter(SearchBar);

非常感谢！

Answer 1

我假设您正在使用react-router v4。这个版本的反应路由器已经转向比以前更多的声明式方法。这种转变如何影响重定向？最简单的重定向方式是渲染<Redirect>反应路由器组件。那整个事情将如何发挥作用？完成后的搜索会将状态部分searchResult:从false更改为例如结果列表。这会导致重新渲染。当你的组件在state中发现非假值时，你的组件就会出现.searchResult将呈现<Redirect>组件指向你的搜索结果路径。

我对状态处理一直很模糊，因为有很多方法可以处理反应中的状态。

您可以查看authentication example in react router docs，它可以根据您的需要做同样的事情（它只执行authenitcation而不是搜索）

无法使用REACT-ROUTER-DOM重定向

1 个答案: