我正在使用Flux + React Router + Firebase在React中创建一个基本博客。我在尝试撰写一篇博客文章时遇到麻烦。当我单击单个帖子的链接时,我尝试从所有帖子列表中过滤掉所有其他帖子,并仅显示我的Firebase数据库中的单个帖子。
我尝试通过将firebase项的键与url参数(如if (this.props.routeParams.key===key)
)进行匹配来实现。我真的不知道该怎么做。欢迎任何建议。
下面是Blogger.jsx,该页面允许用户创建博客文章,然后在该博客文章下方显示所有博客文章标题的列表。
import AltContainer from 'alt-container';
import React from 'react';
import { Link } from 'react-router';
import List from './List.jsx'
import Firebase from 'firebase'
import BlogStore from '../stores/BlogStore'
import BlogActions from '../actions/BlogActions';
const rootURL = 'https://incandescent-fire-6143.firebaseio.com/';
export default class Blogger extends React.Component {
constructor(props) {
super(props);
BlogStore.getState();
BlogStore.mountFirebase();
{console.log(this.props.location.query)}
};
componentDidMount() {
BlogStore.listen((state) => {
this.setState(state)
})
this.firebaseRef = new Firebase(rootURL + 'items/');
}
componentWillMount() {
BlogStore.unlisten((state) => {
this.setState(state)
})
}
renderList = (key) => {
return (
<Link to={`blogshow/${key}`}> <List key={key} blog={this.state.blog[key]} /> </Link>
)
}
handleInputChange = () => {
BlogStore.setState({
title: this.refs.title.value,
text: this.refs.text.value});
}
handleClick = () => {
BlogStore.handleClick();
}
render() {
return (
<div>
<div className="row panel panel-default">
<div className="col-md-8 col-md-offset-2">
<h2>
Create a New Blog Post
</h2>
</div>
</div>
<h2>Blog Title</h2>
<div className="input-group">
<input
ref="title"
value={BlogStore.state.title}
onChange = {this.handleInputChange}
type="text"
className="form-control"/>
<span className="input-group-btn">
</span>
</div>
<h2>Blog Entry</h2>
<div className="input-group">
<textarea
ref="text"
value={BlogStore.state.text}
onChange = {this.handleInputChange}
type="text"
className="form-control"/>
</div>
<div className="blog-submit input-group-btn">
<button onClick={this.handleClick}
className="btn btn-default" type="button">
Publish Blog Post
</button>
</div>
{/*<List blog={this.state.blog} />*/}
{Object.keys(BlogStore.state.blog)
.map(this.renderList)}
</div>
);
}
}
当用户单击指向单个博客文章的链接时,应该将他们传送到仅显示单个博客文章的页面。我称这个组件为BlogShow。我无法呈现BlogShow,因为我不断收到错误
invariant.js?4599:45未捕获的不变违规:BlogShow.render():A
必须返回有效的React元素(或null)。您可能已经回来
未定义,数组或其他无效对象。
这是BlogShow.jsx:
import AltContainer from 'alt-container';
import React from 'react';
import { Link } from 'react-router';
import Blogger from './Blogger'
import List from './List'
const rootURL = 'https://incandescent-fire-6143.firebaseio.com/';
import BlogStore from '../stores/BlogStore'
import BlogActions from '../actions/BlogActions';
export default class BlogShow extends React.Component {
constructor(props) {
super(props);
{console.log(this.props.routeParams.key)}
this.filterList = this.filterList.bind(this);
}
filterList(key) {
if (this.props.routeParams.key===key) {
return (<List key={key} blog={BlogStore.state.blog[key]} />)
}
}
render() {
<div> {Object.keys(BlogStore.state.blog).map(this.filterList)} </div>
}
}
最佳答案
因为您的组件BlogShow
没有返回任何内容,所以您收到该错误。
render() {
<div> {Object.keys(BlogStore.state.blog).map(this.filterList)} </div>
}
应该:
render() {
return <div> {Object.keys(BlogStore.state.blog).map(this.filterList)} </div>
}