Develop Reference

User preferred language saved but the page content language didn't change only after I reload

I'm using ant design pro.
The idea is In the platform we have 2 languages to choose from Fr(French) and En(English),
I want the user when he logs in and change the language to English for example when he logs out and log in again the language should be saved to English so he would be able to see the content in English, I managed to do it, when i login in the backend the preferedLanguage = en, the language toggle in the also changes to en, the only problem the web page content stays in French it's only change in English when i reload the page.
I think the issue is related to the login page, the login page is set to French as default , let's say my preferred language now is English, if i login from the login page. The page content loaded in French only changes when i reload.
-This is the umijs documentation : https://umijs.org/docs/max/i18n#setlocale-%E8%AE%BE%E7%BD%AE%E8%AF%AD%E8%A8%80
-LanguageDropdown (the toggle where you select the language (Fr or En)
import type { FC } from 'react';
import React, { useState, useEffect } from 'react';
import { Menu, Dropdown } from 'antd';
import { CaretDownOutlined, CaretUpOutlined, GlobalOutlined } from '#ant-design/icons';
import styles from './index.less';
import { setLocale, getLocale, getAllLocales } from 'umi';
interface Props {
setUpdateLang: any;
currentLang: string;
}
const LanguageDropdown: FC<Props> = ({ currentLang, setUpdateLang }) => {
const [langvisible, setLangVisible] = useState<boolean>(false);
const [localesList, setLocalesList] = useState<any[]>([]);
const [currentLocale, setCurrentLocale] = useState<string>('');
// useEffect(() => {
// if (currentLang) {
// setLocalesList(getAllLocales());
// setCurrentLocale(getLocale());
// setLocale(currentLang === 'fr' ? 'fr-FR' : 'en-US');
// }
// alert(currentLang);
// alert(getLocale());
// }, [currentLang]);
useEffect(() => {
setLocalesList(getAllLocales());
setCurrentLocale(getLocale());
if (currentLang) {
// alert(222);
const selectedLang = currentLang === 'fr' ? 'fr-FR' : 'en-US';
// setNewLang(selectedLang);
setLocale(selectedLang, false);
setCurrentLocale(getLocale());
}
}, [currentLang]);
const onLangVisibleChange = (visibleLang: boolean) => {
setLangVisible(visibleLang);
};
const langNameHandler = (lang: string) => {
if (lang === 'en-US') return 'EN';
else if (lang === 'fr-FR') return 'FR';
return 'FR';
};
const setNewLang = (lang: string) => {
setUpdateLang({ lang: langNameHandler(lang).toLocaleLowerCase(), updated: true });
setLocale(lang);
};
const Langmenu = (
<Menu>
{localesList?.map((lang: any) => (
<Menu.Item key={lang}>
<a onClick={() => setNewLang(lang)}>{langNameHandler(lang)}</a>
</Menu.Item>
))}
</Menu>
);
return (
<div className={styles.profileDropdownContainer}>
<Dropdown
overlay={Langmenu}
placement="bottomLeft"
trigger={['click']}
onVisibleChange={onLangVisibleChange}
className={styles.dropdown}
>
<div className={styles.langContainer}>
<span>
<GlobalOutlined /> {langNameHandler(currentLocale)}
</span>
{!langvisible ? <CaretDownOutlined /> : <CaretUpOutlined />}
</div>
</Dropdown>
</div>
);
};
export default LanguageDropdown;
-RightContext
import { Tag } from 'antd';
import type { Settings as ProSettings } from '#ant-design/pro-layout';
import React, { useEffect, useState } from 'react';
import type { ConnectProps } from 'umi';
import type { Dispatch } from 'umi';
import { connect } from 'umi';
import type { ConnectState } from '#/models/connect';
import Avatar from './AvatarDropdown';
import styles from './index.less';
import LanguageDropdown from '../languageDropdown';
import moment from 'moment';
export type GlobalHeaderRightProps = {
dispatch: Dispatch;
theme?: ProSettings['navTheme'] | 'realDark';
auth: any;
users: any;
platformLanguage: any;
data: any;
} & Partial<ConnectProps> &
Partial<ProSettings>;
const ENVTagColor = {
dev: 'orange',
test: 'green',
pre: '#87d068',
};
const GlobalHeaderRight: React.FC<GlobalHeaderRightProps> = (props) => {
const [updateLang, setUpdateLang] = useState<{ lang: string; updated: boolean }>({
lang: '',
updated: false,
});
const [currentLang, setCurrentLang] = useState<any>(null);
const { theme, layout, auth, platformLanguage, data, dispatch } = props;
let className = styles.right;
useEffect(() => setCurrentLang(platformLanguage), [platformLanguage]);
useEffect(() => {
if (updateLang.updated) {
const {
organization,
roles,
email,
deleted,
department,
createdById,
organizationId,
...rest
} = data;
const birthdate = moment(rest.birthdate).format('YYYY-MM-DD');
const workversary = moment(rest.workversary).format('YYYY-MM-DD');
dispatch({
type: 'users/updateMe',
payload: {
data: { ...rest, birthdate, workversary, platformLanguage: updateLang.lang },
userId: auth?.currentUser.id,
},
});
setUpdateLang({ ...updateLang, updated: false });
setCurrentLang(updateLang.lang);
}
}, [updateLang]);
if (theme === 'dark' && layout === 'top') {
className = `${styles.right} ${styles.dark}`;
}
return (
<div className={className}>
{currentLang ? (
<LanguageDropdown currentLang={currentLang} setUpdateLang={setUpdateLang} />
) : null}
<Avatar />
{REACT_APP_ENV && (
<span>
<Tag color={ENVTagColor[REACT_APP_ENV]}>{REACT_APP_ENV}</Tag>
</span>
)}
</div>
);
};
export default connect(({ settings, auth, users }: ConnectState) => ({
theme: settings.navTheme,
layout: settings.layout,
auth,
users,
platformLanguage: auth?.currentUser?.membership?.platformLanguage,
data: auth?.currentUser?.membership,
}))(GlobalHeaderRight);
-LoginLayout
import React, { useEffect, useState } from 'react';
import type { ConnectState } from '#/models/connect';
import type { MenuDataItem } from '#ant-design/pro-layout';
import { getMenuData, getPageTitle } from '#ant-design/pro-layout';
import { useIntl, connect } from 'umi';
import type { ConnectProps } from 'umi';
import { Col, Row } from 'antd';
import { Helmet, HelmetProvider } from 'react-helmet-async';
import LoginImage from '../assets/loginImage.png';
import SignUpAdminImage from '../assets/adminSignup.svg';
import styles from './LoginLayout.less';
import LanguageDropdown from '#/components/languageDropdown';
import SignupSideText from '#/components/SignupSideText';
export type UserLayoutProps = {
breadcrumbNameMap: Record<string, MenuDataItem>;
} & Partial<ConnectProps>;
const LoginLayout: React.FC<UserLayoutProps> = (props) => {
const [layoutImage, setLayoutImage] = useState(LoginImage);
const [updateLang, setUpdateLang] = useState<{ lang: string; updated: boolean }>({
lang: '',
updated: false,
});
const [currentLang, setCurrentLang] = useState<any>('');
useEffect(() => {
if (updateLang.updated) {
setUpdateLang({ ...updateLang, updated: false });
setCurrentLang(updateLang.lang);
}
}, [updateLang]);
useEffect(() => {
if (window.location.pathname === '/user/adminSignup/step1') {
setLayoutImage(SignUpAdminImage);
} else if (window.location.pathname === '/user/adminSignup/step2') {
setLayoutImage('TextSignup');
} else setLayoutImage(LoginImage);
}, [window.location.pathname]);
const {
route = {
routes: [],
},
} = props;
const { routes = [] } = route;
const {
children,
location = {
pathname: '',
},
} = props;
const { formatMessage } = useIntl();
const { breadcrumb } = getMenuData(routes);
const title = getPageTitle({
pathname: location.pathname,
formatMessage,
breadcrumb,
...props,
});
return (
<>
<HelmetProvider>
<Helmet>
<title>{title}</title>
<meta name="description" content={title} />
</Helmet>
<div className={styles.container}>
<Col
xl={{ span: 12, order: 1 }}
xs={{ span: 0, order: 2 }}
md={{ span: 0, order: 2 }}
lg={{ span: 0, order: 2 }}
style={{ backgroundColor: '#00bfa5' }}
>
{layoutImage === 'TextSignup' ? (
<SignupSideText />
) : (
<img alt="logo" width="100%" height="100%" src={layoutImage} />
)}
</Col>
<Col
xl={{ span: 12, order: 2 }}
lg={{ span: 24, order: 2 }}
sm={{ span: 24, order: 1 }}
xs={{ span: 24, order: 1 }}
>
{' '}
<Row justify="end" className="languageRow">
<LanguageDropdown currentLang={currentLang} setUpdateLang={setUpdateLang} />
</Row>
{children}
</Col>
</div>
</HelmetProvider>
</>
);
};
export default connect(({ settings }: ConnectState) => ({ ...settings }))(LoginLayout);

High memory usage in React Native FlatList

I am developing an app which allows the user to search for books and then display it in the search results. For displaying the results, I am using a FlatList with 3 columns and displaying the book cover and some basic information about the book.
I am storing the results from the API response in state without the comoponent. As more results are added, the memory consumption increases but the data is in JSON format, no images are store in state.
I have tried, using removeClippedSubviews and few other options that allow setting the window size but that has little to no difference on the memory usage.
Am I missing something here or is there a way to optimise this? Sample code is uploaded to this github repo
Here is the code snippet I am using:
/**
* Sample React Native App
* https://github.com/facebook/react-native
*
* #format
* #flow strict-local
*/
import type { Node } from 'react';
import React, { useEffect, useRef, useState } from 'react';
import {
ActivityIndicator,
FlatList,
Platform,
SafeAreaView,
StatusBar,
StyleSheet,
useColorScheme,
View,
} from 'react-native';
import { Button, SearchBar, useTheme } from 'react-native-elements';
import { searchBooks } from './api/GoogleBooksService';
import HttpClient from './network/HttpClient';
import BookCard from './components/BookCard';
const searchParamsInitialState = {
startIndex: 1,
maxResults: 12,
totalItems: null,
};
let debounceTimer;
const debounce = (callback, time) => {
clearTimeout(debounceTimer);
debounceTimer = setTimeout(callback, time);
};
const isEndOfList = searchParams => {
const { startIndex, maxResults, totalItems } = searchParams;
if (totalItems == null) {
return false;
}
console.log('isEndOfList', totalItems - (startIndex - 1 + maxResults) < 0);
return totalItems - (startIndex - 1 + maxResults) < 0;
};
const App: () => Node = () => {
const isDarkMode = useColorScheme() === 'dark';
const [isLoading, setIsLoading] = useState(false);
const [searchTerm, setSearchTerm] = useState('');
const [globalSearchResults, setGlobalSearchResults] = useState([]);
const [searchParams, setSearchParams] = useState(searchParamsInitialState);
let searchCancelToken;
let searchCancelTokenSource;
// This ref will be used to track if the search Term has changed when tab is switched
const searchRef = useRef();
const clearSearch = () => {
console.log('Clear everything!');
searchRef.current = null;
setGlobalSearchResults([]);
setSearchParams(searchParamsInitialState);
setIsLoading(false);
searchCancelTokenSource?.cancel();
searchCancelToken = null;
searchCancelTokenSource = null;
};
useEffect(() => {
debounce(async () => {
setIsLoading(true);
await searchGlobal(searchTerm);
setIsLoading(false);
}, 1000);
}, [searchTerm]);
/**
* Search method
*/
const searchGlobal = async text => {
if (!text) {
// Clear everything
clearSearch();
return;
}
setIsLoading(true);
try {
// Use the initial state values if the search term has changed
let params = searchParams;
if (searchRef.current !== searchTerm) {
params = searchParamsInitialState;
}
const { items, totalItems } = await searchBooks(
text,
params.startIndex,
params.maxResults,
searchCancelTokenSource?.token,
);
if (searchRef.current === searchTerm) {
console.log('Search term has not changed. Appending data');
setGlobalSearchResults(prevState => prevState.concat(items));
setSearchParams(prevState => ({
...prevState,
startIndex: prevState.startIndex + prevState.maxResults,
totalItems,
}));
} else {
console.log(
'Search term has changed. Updating data',
searchTerm,
);
if (!searchTerm) {
console.log('!searchTerm', searchTerm);
clearSearch();
return;
}
setGlobalSearchResults(items);
setSearchParams({
...searchParamsInitialState,
startIndex:
searchParamsInitialState.startIndex +
searchParamsInitialState.maxResults,
totalItems,
});
}
searchRef.current = text;
} catch (err) {
if (HttpClient.isCancel(err)) {
console.error('Cancelled', err.message);
}
console.error(`Error searching for "${text}"`, err);
}
setIsLoading(false);
};
const renderGlobalItems = ({ item }) => {
return <BookCard book={item} />;
};
const { theme } = useTheme();
return (
<SafeAreaView style={styles.backgroundStyle}>
<StatusBar
barStyle={isDarkMode ? 'light-content' : 'dark-content'}
/>
<View style={styles.container}>
<SearchBar
showLoading={isLoading}
placeholder="Enter search term here"
onChangeText={text => {
setSearchTerm(text);
}}
value={searchTerm}
platform={Platform.OS}
/>
{isLoading && globalSearchResults.length <= 0 && (
<ActivityIndicator animating style={styles.loader} />
)}
{globalSearchResults.length > 0 && (
<FlatList
removeClippedSubviews
columnWrapperStyle={styles.columnWrapper}
data={globalSearchResults}
numColumns={3}
showsHorizontalScrollIndicator={false}
keyExtractor={item => item + item.id}
renderItem={renderGlobalItems}
ListFooterComponent={
<>
{!isLoading &&
!isEndOfList(searchParams) &&
searchParams.totalItems > 0 && (
<Button
type="clear"
title="Load more..."
onPress={async () => {
await searchGlobal(searchTerm);
}}
/>
)}
{isLoading && searchParams.totalItems != null && (
<ActivityIndicator
size="large"
style={{
justifyContent: 'center',
}}
color={theme.colors.primary}
/>
)}
</>
}
/>
)}
</View>
</SafeAreaView>
);
};
const styles = StyleSheet.create({
backgroundStyle: 'white',
container: {
height: '100%',
width: '100%',
},
columnWrapper: {
flex: 1,
},
loader: {
flex: 1,
justifyContent: 'center',
},
});
export default App;

There is something called PureComponent in react native. If you create FlatList as PureComponent, you can see lot of improvement.
It will not rerender items until data has been changed.
for example:
class MyList extends React.PureComponent {
}
For more reference check this

Can you try to chuck your array of list items into small sub-arrays, this package uses this mechanism https://github.com/bolan9999/react-native-largelist
The package has been praised by complex app teams including the Discord Mobile Team - https://discord.com/blog/how-discord-achieves-native-ios-performance-with-react-native

How do I re-load a react component?

I am trying to create an online library, which allows people to issue books. I want to limit the number of issued books to one, i.e a person can have only one issued book at a time. I have a firestore database for this. I read the number of books issued in ComponentDidMount(){}, and I have put an if-else statement to check how many books have been issued. For example, if someone has 1 book issued, it will display a different return(), if someone doesn't have 1 book issued, it will display another return(). It is working fine, but in the same component I have a button that can return the book (NOT return as in return(), return is used here to refer to UN-ISSUE THE BOOK), so I update the number of issued book of each user. But, I am not able to go the else statement. I guess I know why, I mean it checked the value once and entered the condition, but has no command to exit the conditions and check for other conditions. I figured that re-rendering the component should work, so please tell me how I can do this....
Also if there is any other solution to this problem in your mind, please share!
My Code (Sorry, I don't know how to add code in stackoverflow, new here)
import * as React from 'react';
import * as firebase from 'firebase';
import db from '../config'
import { StyleSheet, Text, View, Modal, ScrollView, TextInput , Image, TouchableOpacity, Alert, KeyboardAvoidingView} from 'react-native';
import { Header,Icon } from 'react-native-elements';
export default class AddItemScreen extends React.Component {
constructor(){
super()
this.state = {
itemName:'',
itemDescription:'',
userID : firebase.auth().currentUser.email,
itemID:'',
activeBarters:'',
userDocID : '',
itemDocID:'',
requestedBarter:'',
requestedBarterID:'',
requestedBarterDescription:'',
refresh:'',
}
}
componentDidMount = ()=> {
const userID = this.state.userID
db.collection('users').where('email','==',userID).get().then(snapshot => {
snapshot.forEach(doc => {
var data = doc.data()
this.setState({
activeBarters : data.activeBarters,
userDocID : doc.id
})
})
})
this.getRequestedBarter()
}
updateStatus = ()=> {
const docID = this.state.itemDocID
db.collection('items').doc(docID).update({
'item_status' : 'received'
})
}
addRequestedItem = ()=> {
const itemName = this.state.requestedBarter
const itemDescription = this.state.requestedBarterDescription
const itemID = this.state.requestedBarterID
const user = this.state.userID
db.collection('receivedItems').add({
'item_name' : itemName,
'item_description' : itemDescription,
'item_ID' : itemID,
'item_status' : 'received',
'userID' : user,
})
}
addReceivedNotification = ()=> {
const itemName = this.state.requestedBarter
const userID = this.state.userID
const message = "You received " + itemName + '. Congratulations!'
db.collection('allNotifications').add({
'notification_message' : message,
'senderID' : userID,
'targetedID' : userID,
'notification_status':'unread',
'itemName' : itemName,
})
}
addNotification = ()=> {
const itemName = this.state.itemName
const userID = this.state.userID
const message = 'You just added '+ itemName + ' to our item list! Thanks!'
db.collection('allNotifications').add({
'notification_message' : message,
'senderID' : userID,
'targetedID' : userID,
'notification_status':'unread',
'itemName' : itemName,
})
}
getRequestedBarter = ()=> {
const userID = this.state.userID
db.collection('items').where('userID','==',userID).get().then(snapshot => {
snapshot.forEach(doc => {
if(doc.data().item_status!='received'){
this.setState({
requestedBarter:doc.data().item_name,
requestedBarterDescription:doc.data().item_description,
itemDocID:doc.id,
requestedBarterID:doc.data().item_ID
})
}
})
})
}
addItem = async ()=> {
const name = this.state.itemName
const description = this.state.itemDescription
const itemID = Math.random().toString(36).substring(2)
const user = this.state.userID
if (name && description) {
db.collection('items').add({
"item_name" : name,
"item_description" : description,
"item_ID" : itemID,
"userID" : user,
"item_status" : "available"
})
this.setState({
itemName:'',
itemDescription:'',
})
Alert.alert('Item Added Succesfully')
}
else {
Alert.alert('Please fill Item Name and/or Description')
}
}
updateAcitveBarters = (number)=> {
const docID = this.state.userDocID
const numberArg = number
db.collection('users').doc(docID).update({
activeBarters : numberArg,
})
}
render(){
if (this.state.activeBarters === 1) {
return(
<View style = {styles.container}>
<Header
backgroundColor={'#222831'}
centerComponent={{
text: 'Add Items',
style: { color: '#32e0c4', fontSize: 20 },
}}
leftComponent = {
<Icon
name = 'bars'
type = 'font-awesome'
color = 'white'
onPress = {
()=>{
this.props.navigation.toggleDrawer()
}
}
></Icon>
}
rightComponent = {
<Icon
name = 'plus'
type = 'font-awesome'
color = '#15aabf'
></Icon>
}
></Header>
<Text style = {{color:'#eeeeee', textAlign : 'center', fontSize:18,marginTop:30}}>Sorry, You already have an active request!</Text>
<Text style = {{color:'#eeeeee', textAlign : 'center', fontSize:18,marginTop:30}}>{this.state.requestedBarter}</Text>
<Text style = {{color:'#eeeeee', textAlign : 'center', fontSize:18,marginTop:30}}>{this.state.requestedBarterDescription}</Text>
<TouchableOpacity
style={styles.button}
onPress = {()=>{
this.updateAcitveBarters(0)
this.updateStatus()
this.addReceivedNotification()
this.addRequestedItem()
}}
>
<Text style = {styles.buttonText}>I received the item</Text>
</TouchableOpacity>
</View>
)
}
else {
return (
<View style = {styles.container}>
<Header
backgroundColor={'#222831'}
centerComponent={{
text: 'Add Items',
style: { color: '#32e0c4', fontSize: 20 },
}}
leftComponent = {
<Icon
name = 'bars'
type = 'font-awesome'
color = 'white'
onPress = {
()=>{
this.props.navigation.toggleDrawer()
}
}
></Icon>
}
rightComponent = {
<Icon
name = 'plus'
type = 'font-awesome'
color = '#15aabf'
></Icon>
}
></Header>
<TextInput
style = {styles.textInput}
placeholder = 'Item Name'
onChangeText={
(text)=>{
this.setState({
itemName:text,
})
}
}
value = {this.state.itemName}
></TextInput>
<TextInput
style = {[styles.textInput,{ height:300}]}
placeholder = 'Item Description'
multiline = {true}
onChangeText={
(text)=>{
this.setState({
itemDescription:text,
})
}
}
value = {this.state.itemDescription}
></TextInput>
<TouchableOpacity style = {styles.button} onPress = {()=>{
this.addItem()
this.updateAcitveBarters(1)
this.addNotification()
this.props.navigation.navigate('Notifications')
}}>
<Text style = {styles.buttonText}>Add Item</Text>
</TouchableOpacity>
</View>
)
}
}
}
const styles = StyleSheet.create({
container: {
flex:1,
backgroundColor:'#393e46',
alignSelf:'center',
width:'100%'
},
title:{
backgroundColor:'#222831',
color:'#32e0c4',
fontSize:23,
padding:5,
alignContent:'center',
textAlign:'center',
},
buttonText:{
padding:10,
color:'#32e0c4',
alignSelf:'center',
textAlign:'center',
},
button:{
backgroundColor:'#222831',
width:100,
marginTop:40,
alignSelf:'center',
height:60,
alignItems:'center',
},
textInput:{
marginTop:30,
padding:10,
alignSelf:'center',
borderWidth:5,
borderColor:'#32e0c4',
width:300,
color:"#eeeeee",
},
})

Call your firebase API and re-initialize your state like you did in componentDidMount
updateApi() {
const userID = this.state.userID
db.collection('users').where('email','==',userID).get().then(snapshot => {
snapshot.forEach(doc => {
var data = doc.data()
this.setState({
activeBarters : data.activeBarters,
userDocID : doc.id
})
})
})
this.getRequestedBarter()
}
componentDidMount() {
this.updateApi();
}
updateAcitveBarters = (number)=> {
const docID = this.state.userDocID
const numberArg = number
db.collection('users').doc(docID).update({
activeBarters : numberArg,
})
this.updateApi();
}

How can the render be synced with the state on pagination click with react?

I created a suggestions search and its built to break up the fetch based on the current page. The state is console.loged correctly, but the render is one page click event behind. This is obviously not the behavior we want. It seems like the state is being updated fine. I have tried to refactor the code difference ways, and even tried this.forceUpdate()
Here is the code
SearchOrderBar.js
import React, { Component } from "react";
import {Input, Label, Table, Icon, Header, Menu} from 'semantic-ui-react';
import "./SearchOrderBar.css";
// import { resolve } from "dns";
// import PropTypes from 'prop-types';
import Pagination from '../Search/Pagination';
class SearchOrderBar extends Component {
constructor(props) {
super(props);
this.text = "";
this.state = {
suggestions: [],
addToQuery: false,
Query: [],
pagesNeeded: 0,
page: 1
};
let searchTerm = null;
const {pageLimit = null, keyTimer = null, } = props;
this.pageLimit = typeof pageLimit === 'number' ? pageLimit : 10;
this.handlePageClick = this.handlePageClick.bind(this);
this.fetchCallBack = this.fetchCallBack.bind(this);
// this.addToQuery = this.addToQuery.bind(this);
this.keyUpHandler = this.keyUpHandler.bind(this);
this.keyDownHandler = this.keyDownHandler.bind(this);
}
handlePageClick(page){
this.forceUpdate();
this.setState({
page: page
})
this.fetchCallBack();
}
//This fetch should be called in a dynamic switch case
fetchCallBack() {
let y = this.pageLimit;
let x = this.state.page > 1 ? (this.pageLimit*this.state.page) - this.pageLimit : 0;
// Return a promise
return new Promise((resolve, reject) => {
let searchTerm = this.searchTerm;
return fetch(`http://localhost:5000/api/searchorders/${searchTerm}/${x}/${y}`)
.then(res => {
if (!res.ok) {
throw res;
}
// Convert serialized response into json
return res.json()
}).then(data => {
//Use data
let searchTerm = data.map(data => {
let rData = {};
rData = data;
return rData;
})
this.item = searchTerm;
//console.log('here from callback')
this.setState({
suggestions: []
})
return searchTerm;
}).then( data => {
// console.log(this.totalRecords)sd
//console.log(data)
if (searchTerm.length === 0) {
this.setState({
suggestions: [],
rangeCount_URL: `http://localhost:5000/api/searchorderscount/${searchTerm}`
});
} else {
const suggestions = data.filter(function(v){
if(Object.values(v).includes(searchTerm.toLowerCase()) !== -1 || Object.values(v).includes(searchTerm.toUpperCase()) !== -1){
return v
}
})
console.log(suggestions)
this.text = searchTerm;
this.setState({ suggestions: suggestions.sort()});
}
})
})
}
pageCountCallBack(){
return new Promise((resolve, reject) => {
let searchTerm = this.searchTerm;
return fetch(`http://localhost:5000/api/searchorderscount/${searchTerm}/`)
.then(res => {
if (!res.ok) {
throw res;
}
// Convert serialized response into json
return res.json()
}).then(data => {
//Use data
let searchTerm = data.map(data => {
let rData = {};
rData = data;
return rData;
})
this.item = searchTerm;
// console.log('here from Page Count callback')
this.renderSuggestions();
resolve(searchTerm)
})
})
}
keyUpHandler = (e) => {
if(e.target.value.length >= 3){
this.keyTimer = setTimeout(this.countFetch(e), 1500);
} else {
this.setState(() => {
return {
suggestions : [],
pagesNeeded : 0
}
})
clearTimeout(this.keyTimer);
}
}
keyDownHandler = (e) => {
clearTimeout(this.keyTimer);
}
//Any time text is changed in the text field
countFetch = (e) => {
const value = e.target.value;
this.searchTerm = value;
this.pageCountCallBack().then(data => {
const totalRecords = data[0].rows;
this.setState(() => {
return {pagesNeeded : Math.ceil(totalRecords / this.pageLimit)}
})
//console.log("total" + totalRecords);
//console.log("page limit"+this.pageLimit);
//console.log("Needed" + this.state.pagesNeeded );
})
this.fetchCallBack();
}
renderSuggestions() {
//const { suggestions } = this.state;
const tableStyle = {
'tableLayout': 'fixed',
'overflowWrap': 'break-word'
}
return (
<Table style={tableStyle} celled>
{this.state.suggestions.length === 0 ?
(<Table.Body>
<Table.Cell colSpan="7">
<div className="ui fluid warning icon message">
<Icon name="exclamation triangle" size="huge" color="orange"/>
<div className="content">
<Header>No Records Found</Header>
<p>Try Seaching by one of the following:</p>
<ul>
<dt>Name</dt>
<dt>Order Number</dt>
<dt>Address (Shipping or Billing )</dt>
<dt>Phone Number</dt>
<dt>Email</dt>
</ul>
</div>
</div>
</Table.Cell>
</Table.Body>)
: (
<>
<Table.Header>
<Table.Row>
<Table.HeaderCell>Order#</Table.HeaderCell>
<Table.HeaderCell>Billing Address</Table.HeaderCell>
<Table.HeaderCell>Shipping Address</Table.HeaderCell>
<Table.HeaderCell>Email</Table.HeaderCell>
<Table.HeaderCell>Phone Number</Table.HeaderCell>
<Table.HeaderCell>Sales Channel</Table.HeaderCell>
<Table.HeaderCell>Order Date</Table.HeaderCell>
</Table.Row>
</Table.Header>
<Table.Body>
{this.state.suggestions.map((item, index) => (
<Table.Row className="hoverRow">
<Table.Cell key={index} onClick={() => this.addToQuery(item)}>
{item.customerPO}
</Table.Cell>
<Table.Cell>
{item.billToAddress}
</Table.Cell>
<Table.Cell>{item.shipToAddress}</Table.Cell>
<Table.Cell>{item.email}</Table.Cell>
<Table.Cell>{item.phone}</Table.Cell>
<Table.Cell>{item.customerContact}</Table.Cell>
<Table.Cell>{item.dateCreated}</Table.Cell>
</Table.Row>
))}
</Table.Body>
</>
)
}
<Pagination key={this.state.pagesNeeded} tableCols="7" pagesNeeded={this.state.pagesNeeded} btnLimit={5} pageClick={this.handlePageClick} currPage={this.state.page} pageLimit={this.pageLimit}/>
</Table>
);
}
handleIconClick(){
console.log('icon clicked ' + this.state.Query )
}
render() {
const {text} = this.state
//console.log(this.state)
return (
<>
<div className="App-Component">
<div className="App-Search">
<Input icon={{ name: 'search', circular: true, link: true, onClick: () => this.handleIconClick() }} placeholder="Search" value={text} type="text" onKeyUp={this.keyUpHandler} onKeyDown={this.keyDownHandler} className="App-Search"/>
{this.renderSuggestions()}
</div>
</div>
</>
);
}
}
export default SearchOrderBar;
Here is the pagination but I don't think this matters as much for the solution. It is relevant for the page button click.
import React, {Component} from 'react';
import {Input, Label, Table, Icon, Header, Menu} from 'semantic-ui-react'
/**
* Helper Method for creating a range of Numbers
* Range )( )
*/
const range = (from, to, step = 1) => {
let i = from;
const range = [];
while (i<=to) {
range.push(i);
i+=step;
}
}
export default class Pagination extends Component {
constructor(props){
super(props)
const { totalRecords = null, pageNeighbours = 0, rangeCount_URL = this.props.rangeCount_URL, pageArray = [] } = props;
this.pageArray = typeof pageArray === 'array' ? pageArray : [];
}
renderPagination = () => {
//console.log("hello from pagination");
let n = this.props.pagesNeeded;
let pArray = [];
let page = this.props.currPage;
//console.log(n)
if (page > 1){
pArray.push(<Menu.Item as='a' icon onClick={() => this.props.pageClick(page-1)}>
<Icon name='chevron left' />
</Menu.Item>)
}
for(let i = (page >1 ? page-1: page); pArray.length < (page > this.props.btnLimit ? this.props.btnLimit+1 : this.props.btnLimit); i++){
//console.log(i);
pArray.push(<Menu.Item index={i} className={i == page ? 'active' : ''} onClick={() => this.props.pageClick(i)} as='a'>{i}</Menu.Item>)
}
if (page < n){
pArray.push(<Menu.Item as='a' icon onClick={() => this.props.pageClick(page+1)}>
<Icon name='chevron right' />
</Menu.Item>)
}
this.pageArray = pArray;
return pArray;
}
render(){
const pageCount = (() => {
const totalRecords = this.totalRecords;
if(totalRecords > 0){
return (this.totalPages = Math.ceil(this.totalRecords / this.props.pageLimit))
}
})();
//console.log(this.pageArray);
return(
<Table.Footer>
{ this.props.pagesNeeded > 1 &&
<Table.Row>
<Table.HeaderCell colSpan={this.props.tableCols}>
<Menu floated='right' pagination>
{this.renderPagination()}
</Menu>
</Table.HeaderCell>
</Table.Row>
}
</Table.Footer>
)
}
}

setState is batched and invoked asynchronously, meaning when you call to this.setState({page}) then read this.state.page in fetchCallBack you probably get the "old" page and not the new page.
Either pass the page directly to fetchCallBack
this.fetchCallBack(page)
And read the page from it and not directly from the state
Or call it as the second argument of setState which is a callback that react will invoke right after the state has been updated.
this.setState({ page }, this.fetchCallBack);

At the point fetchCallBack is called, this.state.page is not updated yet because setState is called asynchronously, that's why it's using the old value. Try this:
handlePageClick(page) {
this.setState({ page }, this.fetchCallBack);
}
The callback syntax allows you to run the function in the next iteration.

How to target specific element after mapping and passing onClick function as props

I am facing such problem, i got my array of records fetched from an API, mapped it into single elements and outputting them as single components. I have function which changes state of parent Component, passes value to child component and child component should hide/show div content after button is clicked.
Of course. It is working, but partially - my all divs are being hidden/shown. I have set specific key to each child component but it doesn't work.
App.js
import React, { Component } from 'react';
import './App.css';
import axios from 'axios';
import countries from '../../countriesList';
import CitySearchForm from './CitySearchForm/CitySearchForm';
import CityOutput from './CityOutput/CityOutput';
import ErrorMessage from './ErrorMessage/ErrorMessage';
class App extends Component {
state = {
country: '',
error: false,
cities: [],
infoMessage: '',
visible: false
}
getCities = (e) => {
e.preventDefault();
const countryName = e.target.elements.country.value.charAt(0).toUpperCase() + e.target.elements.country.value.slice(1);
const countryUrl = 'https://api.openaq.org/v1/countries';
const wikiUrl ='https://en.wikipedia.org/w/api.php?action=query&prop=extracts&exintro&explaintext&format=json&category=city&redirects&origin=*&titles=';
const allowedCountries = new RegExp(/spain|germany|poland|france/, 'i');
if (allowedCountries.test(countryName)) {
axios
.get(countryUrl)
.then( response => {
const country = response.data.results.find(el => el.name === countryName);
return axios.get(`https://api.openaq.org/v1/cities?country=${country.code}&order_by=count&sort=desc&limit=10`)
})
.then( response => {
const cities = response.data.results.map(record => {
return { name: record.city };
});
cities.forEach(city => {
axios
.get(wikiUrl + city.name)
.then( response => {
let id;
for (let key in response.data.query.pages) {
id = key;
}
const description = response.data.query.pages[id].extract;
this.setState(prevState => ({
cities: [...prevState.cities, {city: `${city.name}`, description}],
infoMessage: prevState.infoMessage = ''
}))
})
})
})
.catch(error => {
console.log('oopsie, something went wrong', error)
})
} else {
this.setState(prevState => ({
infoMessage: prevState.infoMessage = 'This is demo version of our application and is working only for Spain, Poland, Germany and France',
cities: [...prevState.cities = []]
}))
}
}
descriptionTogglerHandler = () => {
this.setState((prevState) => {
return { visible: !prevState.visible};
});
};
render () {
return (
<div className="App">
<ErrorMessage error={this.state.infoMessage}/>
<div className="form-wrapper">
<CitySearchForm getCities={this.getCities} getInformation={this.getInformation} countries={countries}/>
</div>
{this.state.cities.map(({ city, description }) => (
<CityOutput
key={city}
city={city}
description={description}
show={this.state.visible}
descriptionToggler={this.descriptionTogglerHandler} />
))}
</div>
);
}
}
export default App;
CityOutput.js
import React, { Component } from 'react';
import './CityOutput.css';
class CityOutput extends Component {
render() {
const { city, descriptionToggler, description, show } = this.props;
let descriptionClasses = 'output-record description'
if (show) {
descriptionClasses = 'output-record description open';
}
return (
<div className="output">
<div className="output-record"><b>City:</b> {city}</div>
<button onClick={descriptionToggler}>Read more</button>
<div className={descriptionClasses}>{description}</div>
</div>
)
}
};
export default CityOutput;

Put the visible key and the toggle function in the CityOutput instead of having it in the parent
import React, { Component } from "react";
import "./CityOutput.css";
class CityOutput extends Component {
state = {
visible: true
};
descriptionTogglerHandler = () => {
this.setState({ visible: !this.state.visible });
};
render() {
const { city, description } = this.props;
let descriptionClasses = "output-record description";
if (this.state.visible) {
descriptionClasses = "output-record description open";
}
return (
<div className="output">
<div className="output-record">
<b>City:</b> {city}
</div>
<button onClick={() => this.descriptionTogglerHandler()}>Read more</button>
<div className={descriptionClasses}>{description}</div>
</div>
);
}
}
export default CityOutput;

There are two ways of how I would approach this,
The first one is setting in your state a key property and check and compare that key with the child keys like:
state = {
country: '',
error: false,
cities: [],
infoMessage: '',
visible: false.
currKey: 0
}
descriptionTogglerHandler = (key) => {
this.setState((prevState) => {
return { currKey: key, visible: !prevState.visible};
});
};
// then in your child component
class CityOutput extends Component {
render() {
const { city, descriptionToggler, description, show, currKey, elKey } = this.props;
let descriptionClasses = 'output-record description'
if (show && elKey === currKey) {
descriptionClasses = 'output-record description open';
}
return (
<div className="output">
<div className="output-record"><b>City:</b> {city}</div>
<button onClick={() => descriptionToggler(elKey)}>Read more</button>
<div className={descriptionClasses}>{description}</div>
</div>
)
}
};
The other way is to set an isolated state for every child component
class CityOutput extends Component {
constructor(props) {
this.state = {
show: false
}
}
function descriptionToggler() {
const {show} = this.state;
this.setState({
show: !show
})
}
render() {
const { city, descriptionToggler, description } = this.props;
let descriptionClasses = 'output-record description'
if (this.state.show) {
descriptionClasses = 'output-record description open';
}
return (
<div className="output">
<div className="output-record"><b>City:</b> {city}</div>
<button onClick={descriptionToggler}>Read more</button>
<div className={descriptionClasses}>{description}</div>
</div>
)
}
};
I hope this helps ;)