Reactjs 什么';处理未安装组件的错误的最佳方法是什么?正在尝试实现CKEditor,但出现此错误
将CKeditor实现为react模式后,我会出现以下错误: 警告:无法对已卸载的组件执行React状态更新。 这是一个no-op,但它表示应用程序中存在内存泄漏。 若要修复,请取消useEffect中的所有订阅和异步任务 清理功能 CKeditor出现在第132行,以下是实现代码:Reactjs 什么';处理未安装组件的错误的最佳方法是什么?正在尝试实现CKEditor,但出现此错误,reactjs,react-redux,ckeditor,react-state,Reactjs,React Redux,Ckeditor,React State,将CKeditor实现为react模式后,我会出现以下错误: 警告:无法对已卸载的组件执行React状态更新。 这是一个no-op,但它表示应用程序中存在内存泄漏。 若要修复,请取消useEffect中的所有订阅和异步任务 清理功能 CKeditor出现在第132行,以下是实现代码: import { Avatar } from "@material-ui/core"; import { MoreHorizOutlined, ShareOutlined } from &quo
import { Avatar } from "@material-ui/core";
import { MoreHorizOutlined, ShareOutlined } from "@material-ui/icons";
import ArrowUpwardOutlinedIcon from "@material-ui/icons/ArrowUpwardOutlined";
import ArrowDownwardOutlinedIcon from "@material-ui/icons/ArrowDownwardOutlined";
import RepeatOutlinedIcon from "@material-ui/icons/RepeatOutlined";
import ChatBubbleOutlineOutlinedIcon from "@material-ui/icons/ChatBubbleOutlineOutlined";
import React, { useEffect, useState } from "react";
import "../style/Post.css";
import Modal from "react-modal";
import { useDispatch, useSelector } from "react-redux";
import {
selectQuestionId,
selectQuestionName,
setQuestionInfo,
} from "../features/questionSlice";
import db from "../firebase";
import { selectUser } from "../features/userSlice";
import firebase from "firebase";
import ClassicEditor from "@ckeditor/ckeditor5-react";
import { CKEditor } from "@ckeditor/ckeditor5-build-classic";
Modal.setAppElement("#root");
function Post({ Id, question, imageUrl, timestamp, buildFaastUser }) {
const user = useSelector(selectUser);
const [openModal, setOpenModal] = useState(false);
const dispatch = useDispatch();
const questionId = useSelector(selectQuestionId);
const questionName = useSelector(selectQuestionName);
const [answer, setAnswer] = useState("");
const [getAnswer, setGetAnswer] = useState([]);
useEffect(() => {
if (questionId) {
db.collection("questions")
.doc(questionId)
.collection("answer")
.orderBy("timestamp", "desc")
.onSnapshot((snapshot) =>
setGetAnswer(
snapshot.docs.map((doc) => ({ id: doc.id, answers: doc.data() }))
)
);
}
}, [questionId]);
const handleAnswer = (e) => {
e.preventDefault();
if (questionId) {
db.collection("questions").doc(questionId).collection("answer").add({
questionId: questionId,
timestamp: firebase.firestore.FieldValue.serverTimestamp(),
answer: answer,
user: user,
});
console.log(questionId, questionName);
setAnswer("");
setOpenModal(false);
}
};
return (
<div
className="post"
onClick={() =>
dispatch(
setQuestionInfo({
questionId: Id,
questionName: question,
})
)
}
>
<div className="post__info">
<Avatar src={buildFaastUser.photo} />
<h5>
{buildFaastUser.displayName
? buildFaastUser.displayName
: buildFaastUser.email}
</h5>
<small>{new Date(timestamp?.toDate()).toLocaleString()}</small>
</div>
<div className="post__body">
<div className="post__question">
<p>{question}</p>
<button
onClick={() => setOpenModal(true)}
className="post__btnAnswer"
>
Answer
</button>
<Modal
isOpen={openModal}
onRequestClose={() => setOpenModal(false)}
shouldCloseOnOverlayClick={false}
style={{
overlay: {
width: 680,
height: 550,
backgroundColor: "transparent",
boxShadow:
"box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);",
zIndex: "1000",
top: "50%",
left: "50%",
marginTop: "-250px",
marginLeft: "-350px",
},
}}
>
<div className="modal__question">
<h1>{question}</h1>
<p>
asked by{" "}
<span className="name">
{buildFaastUser.displayName
? buildFaastUser.displayName
: buildFaastUser.email}
</span>{" "}
{""}
on{" "}
<span className="name">
{new Date(timestamp?.toDate()).toLocaleString()}
</span>
</p>
</div>
<div className="modal__answer">
<CKEditor
required
editor={ClassicEditor}
data={answer}
onChange={(e, editor) => {
const data = editor.getData();
setAnswer(e.target.data);
}}
placeholder="Enter your answer"
type="text"
/>
</div>
<div className="modal__button">
<button className="cancel" onClick={() => setOpenModal(false)}>
Cancel
</button>
<button onClick={handleAnswer} type="submit" className="add">
Add Answer
</button>
</div>
</Modal>
</div>
<div className="post__answer">
{getAnswer.map(({ id, answers }) => (
<p key={id} style={{ position: "relative", paddingBottom: "5px" }}>
{Id === answers.questionId ? (
<span>
{answers.answer}
<br />
<span
style={{
position: "absolute",
color: "gray",
fontSize: "small",
display: "flex",
right: "0px",
}}
>
<span style={{ color: "lightblue" }}>
{answers.user.displayName
? answers.user.displayName
: answers.user.email}{" "}
on{" "}
{new Date(answers.timestamp?.toDate()).toLocaleString()}
</span>
</span>
</span>
) : (
""
)}
</p>
))}
</div>
<img src={imageUrl} alt="" />
</div>
<div className="post__footer">
<div className="post__footerAction">
<ArrowUpwardOutlinedIcon />
<ArrowDownwardOutlinedIcon />
</div>
<RepeatOutlinedIcon />
<ChatBubbleOutlineOutlinedIcon />
<div className="post__footerLeft">
<ShareOutlined />
<MoreHorizOutlined />
</div>
</div>
</div>
);
}
export default Post;
从“@material ui/core”导入{Avatar}”;
从“@material ui/icons”导入{MoreHorizOutlined,ShareOutlined}”;
从“@material ui/icons/ArrowUpwardOutlinedIcon”导入ArrowUpwardOutlinedIcon;
从“@material ui/icons/ArrowDownwardOutlinedIcon”导入ArrowDownwardOutlinedIcon;
从“@material ui/icons/RepeatOutlinedIcon”导入RepeatOutlinedIcon;
从“@material ui/icons/chatbugbleoutlined”导入chatbugbleoutlinedicon;
从“React”导入React,{useffect,useState};
导入“./style/Post.css”;
从“反应模态”导入模态;
从“react redux”导入{useDispatch,useSelector};
进口{
选择问题ID,
选择问题名称,
setQuestionInfo,
}来自“./features/questionSlice”;
从“./firebase”导入数据库;
从“./features/userSlice”导入{selectUser};
从“firebase”导入firebase;
从“@ckeditor/ckeditor5 react”导入ClassicEditor;
从“@CKEditor/ckeditor5 build classic”导入{CKEditor}”;
Modal.setAppElement(“#根”);
函数Post({Id,question,imageUrl,timestamp,buildFaastUser}){
const user=useSelector(selectUser);
const[openModal,setOpenModal]=useState(false);
const dispatch=usedpatch();
const questionId=useSelector(selectQuestionId);
const questionName=useSelector(selectQuestionName);
const[answer,setAnswer]=useState(“”);
常量[getAnswer,setGetAnswer]=useState([]);
useffect(()=>{
如果(问题ID){
db.收集(“问题”)
.doc(问题ID)
.收集(“答案”)
.orderBy(“时间戳”、“描述”)
.onSnapshot((快照)=>
设定答案(
snapshot.docs.map((doc)=>({id:doc.id,answers:doc.data()}))
)
);
}
},[questionId]);
常数handleAnswer=(e)=>{
e、 预防默认值();
如果(问题ID){
db.集合(“问题”).文档(问题ID).集合(“回答”).添加({
问号:问号,
时间戳:firebase.firestore.FieldValue.serverTimestamp(),
答:答,,
用户:用户,,
});
console.log(questionId、questionName);
设置应答(“”);
SetOpenModel(假);
}
};
返回(
派遣(
设置问题信息({
问题Id:Id,
问题名称:问题,
})
)
}
>
{buildFaastUser.displayName
?buildFaastUser.displayName
:buildFaastUser.email}
{新日期(时间戳?.toDate()).tolocalString()}
{问题}
SetOpenModel(真)}
className=“post\uu btnAnswer”
>
答复
setOpenModel(假)}
shouldCloseOnOverlayClick={false}
风格={{
覆盖:{
宽度:680,
身高:550,
背景色:“透明”,
boxShadow:
“长方体阴影:0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);”,
zIndex:“1000”,
顶部:“50%”,
左:“50%”,
marginTop:“-250px”,
marginLeft:“-350px”,
},
}}
>
{问题}
由{“}提出
{buildFaastUser.displayName
?buildFaastUser.displayName
:buildFaastUser.email}
{" "}
{""}
关于{“}
{新日期(时间戳?.toDate()).tolocalString()}
{
const data=editor.getData();
设置应答(如目标数据);
}}
占位符=“输入您的答案”
type=“text”
/>
setOpenModel(false)}>
取消
添加答案
{getAnswer.map({id,answers})=>(
{Id==answers.questionId(
{答案。答案}
{answers.user.displayName
?answers.user.displayName
:answers.user.email}{“}
关于{“}
{新日期(answers.timestamp?.toDate()).tolocalString()}
) : (
""
)}
))}
);
}
导出默认帖子;
我是一个新的反应,所以可能有一些基本的我错过了在执行方面。我肯定知道问题出在CKeditor实现上,但我不确定问题出在哪里,因为它是一个相当简单的组件。我能够通过将装入的局部变量设置为true来消除未装入的错误,我在效果的清理函数中将其设置为false(如react所建议的)。然后我更新状态,当且仅当该值为真时,即如果
useEffect(() => {
let mounted = true;
if (questionId) {
db.collection("questions")
.doc(questionId)
.collection("answer")
.orderBy("timestamp", "desc")
.onSnapshot((snapshot) => {
if (mounted) {
setGetAnswer(
snapshot.docs.map((doc) => ({ id: doc.id, answers: doc.data() }))
);
}
});
}
return () => (mounted = false);
}, [questionId]);