I face this export error of Cookie using in react - reactjs

I do have this code and I'm going to use Cookies for first time but I get error below , anyone who can help me to fix the problem ?
"ERROR I FACE : Attempted import error: 'react-cookie' does not contain a default export (imported as 'Cookie'). "
import React from 'react';
import ReactDom from 'react-dom';
import './App.css';
import CountDown from './CountDown';
import Basket from './Basket';
import Cookie from 'react-cookie'
class Products extends React.Component{
constructor(props){
super(props);
this.state={
order : []
}
this.shop = this.shop.bind(this);
}
prevstate = [];
`enter code here`shop(evt){
this.prevstate.push(evt.target.id);
this.setState({
order : this.prevstate
})
console.log(Cookie.get('selected'))
Cookie.set('selected' , this.props.cart , {path :' /'});
}
render(){
return(
<div className="prowrap">
{this.props.prolist.map((name) => (
<div className="pro" key={name.id} style={{border:"1px red
solid"}} >
<img src={name.image}/>
<p>{name.name}</p>
<p>{name.detail}</p>
<p className="countdown"><CountDown time={name.date}/></p>
<div className="price">{name.price} Euro</div>
<button className="shop" id={name.id} onClick={this.shop}>Add To
Cart</button>
</div>))}
<Basket cart={this.state.order} allpro={this.props.prolist}/>
</div>
)
}
}
export default Products;

The error is clear react-cookie doesn’t have default export so you cannot import it like
import Cookie from 'react-cookie';
You need to import it like below
import { Cookies } from 'react-cookie';
Also it's not Cookie but Cookies. You are importing it wrongly
When it is default export then you don’t use {} to import but if it is not default export then you use {} to import it.

You need to import like import { withCookies, Cookies } from 'react-cookie'; and then cookies.get('selected'), refer the code below
Read the package readme carefully.
// App.jsx
import React, { Component } from 'react';
import { instanceOf } from 'prop-types';
import { withCookies, Cookies } from 'react-cookie';
import NameForm from './NameForm';
class App extends Component {
static propTypes = {
cookies: instanceOf(Cookies).isRequired
};
constructor(props) {
super(props);
const { cookies } = props;
this.state = {
name: cookies.get('name') || 'Ben'
};
}
handleNameChange(name) {
const { cookies } = this.props;
cookies.set('name', name, { path: '/' });
this.setState({ name });
}
render() {
const { name } = this.state;
return (
<div>
<NameForm name={name} onChange={this.handleNameChange.bind(this)} />
{this.state.name && <h1>Hello {this.state.name}!</h1>}
</div>
);
}
}
export default withCookies(App);

Related

Cannot get value from state - React

Hey this is my code and I want to print the networkType but it is not priniting out anything this code was working in App.js but not in home.js.
I created a class component in home.js
Home.js:
import {Component, React} from 'react';
import { BrowserRouter as Router, Link } from 'react-router-dom';
import Web3 from 'web3';
class Home extends Component
{
state={
person : [
{networkType:'None'}
]
}
componentDidMount()
{
this.loadBlockchainData();
}
async loadBlockchainData()
{
const web3 = new Web3(Web3.givenProvider || "https://localhost:8545");
const network = await web3.eth.net.getNetworkType();
this.setState(
{
person:[
{networkType:network}
]
}
)
}
render()
{
return(
<div>
<h1>Hello</h1>
<h1>Network is: {this.state.networkType}</h1>
</div>
)
}
}
export default Home;
Just update like this:
this.state.person[0].networkType

ReactJS: Problem accessing this.context in a class based consumer component

I have a problem to access this.context in a class based consumer component. I have the following situation:
AppContext.js:
import React from "react";
const ContactContext = React.createContext(); // Create our context
export default ContactContext;
DataProvider.js:
import React, { Fragment } from "react";
import AppContext from "./AppContext";
export default class DataProvider extends React.Component {
state = {
contacts: {
contact1: {
id: 1,
firstName: 'Test User FN',
lastName: 'Test User LN'
}
}
};
render() {
return (
<>
<AppContext.Provider value={{contacts: this.state.contacts}}>
{this.props.children}
</AppContext.Provider>
</>
);
}
}
App.js:
import React from 'react';
import DataProvider from "./DataProvider";
import Contact from './components/contact/contact.component';
export default class App extends React.Component {
render() {
return (
<div>
<div className="container">
<DataProvider>
<Contact contactIndex={0}/>
</DataProvider>
</div>
</div>
);
}
}
The consumer Contact.js:
import React, { Component } from "react";
import AppContext from '../context/AppContext'
export default class Contact extends Component {
static contextType = AppContext;
componentDidMount () {
console.log('My context is: ' + this.context);
}
render() {
return (
<div className="card"></div>
);
}
}
The console output is:
My context is: undefined
Thanks for any help
Regards
Dakir
Only difference I see in the other answer's CodeSandbox is the import path is different.
import AppContext from "./AppContext";
vs:
import AppContext from '../context/AppContext'
Maybe OP has a filepath/import error?
p.s. If this is the error, TypeScript is a lifesaver for avoiding these kind of things in JS.
Your code seems right to me, I tried to replicate it in a Sandbox to find out the error and somehow works like a charm.
https://codesandbox.io/s/interesting-https-emgoz?file=/src/App.js
Tried to spot the difference but I couldn't honestly.

Need help! React Component Export not working >_<

Im having this issue where even though I'm exporting both components
SearchBar & MainCard I keep getting this error message in my
App.js file. Any feedback is appreciated!
Error:
./src/App.js - Attempted import error: 'MainCard' is not exported from './components/ui-componets/SearchBar'.
App.js
import React, { Component } from 'react';
import { Container, Theme } from '#customLibrary/core'
import { connect } from 'react-redux';
import { fetchComponent } from './actions';
import TopMenu from './components/ui-componets/TopMenu';
import {SearchBar,MainCard} from './components/ui-componets/SearchBar';
class App extends Component {
state = {
visible: true,
width: 13,
}
handleClick = () => {
this.setState({ visible: !this.state.visible, width: 16 })
}
render() {
const { userData } = this.props;
const { visible } = this.state;
return <Theme>
<Container width='3379px'>
</Container>
<Container width='3379px'>
<TopMenu onClick={this.handleClick} userData={userData} />
</Container>
<Container width='3379px'>
<SearchBar />
</Container>
<Container width='3379px'>
<MainCard/>
</Container>
</Theme>
}
}
const mapStateToProps = (state) => {
return {
userData: state.user
}
}
export default connect(mapStateToProps, { fetchComponent })(App);
SearchBar.js
import React, { Component } from 'react';
import { IS_FETCHING_DBUSERS, FETCH_DBUSERS_SUCCESS, IS_FETCHING_ROLES, FETCH_ROLES_SUCCESS, IS_FETCHING_RESOURCES, FETCH_RESOURCES_SUCCESS } from '../../actions/keys';
import { users, Roles, Resources } from '../../actions/URI';
import { fetchComponent } from '../../actions/index';
import { connect } from 'react-redux';
import _ from 'lodash';
import {
Theme,
Grid, Form, Icon, Container, Loader,
Card, Typography, Tabs
} from '#customLibrary/core';
class SearchBar extends Component {
...
}
class MainCard extends Component {
...
}
const mapStateToProps = state => {
return {
Users: state.users,
roles: state.roles,
resources: state.resources,
}
}
export default connect(mapStateToProps, { fetchComponent })(SearchBar,MainCard);
import {SearchBar,MainCard} from './components/ui-componets/SearchBar';
You have used default export while exporting, but using the syntax for named imports while importing.
import CustomName from './components/ui-componets/SearchBar';
should work
Issue: You've not correctly exported MainCard, and you export them as a default export (i.e. only one component is exported), but you import them as named exports.
export default connect(mapStateToProps, { fetchComponent })(SearchBar,MainCard);
Solution: From what I know, the connect HOC can only decorate a single component at a time. If you want to export both then you'll need to connect both individually as named exports (i.e. remove the default keyword.
export const ConnectedSearchBar = connect(mapStateToProps, { fetchComponent })(SearchBar);
export const ConnectedMainCard = connect(mapStateToProps, { fetchComponent })(MainCard);
Now the import in App will work
import { SearchBar, MainCard } from './components/ui-componets/SearchBar';

Can access simple react state but not props

I'm new to React so this may be simple to fix, but I cannot access {this.props.AvgRating} in the ReviewsTotalStars.js file. I'm having to use the following state code to access a variable called ratingStars:
this.state = {
ratingStars: 3.5
};
But I don't want to use the above ratingStars, and would instead prefer to use the props.AvgRating. Why cannot I access it? Here is my simple code:
index.js:
import React, { Component } from "react";
import { render } from "react-dom";
import ReviewsLeftArea from "./ReviewsLeftArea";
import "./style.css";
const avgRating = 3.5;
class App extends Component {
constructor() {
super();
this.state = {
name: "React"
};
}
render() {
return (
<div>
<ReviewsLeftArea AvgRating={avgRating} />
</div>
);
}
}
render(<App />, document.getElementById("root"));
ReviewsLeftArea.js:
import React from "react";
import ReviewsTotalStars from "./ReviewsTotalStars";
export default class ReviewsLeftArea extends React.Component {
render() {
return (
<div>
<ReviewsTotalStars avgRating={this.props.AvgRating} />
</div>
);
}
}
ReviewsTotalStars.js:
import React from "react";
export default class ReviewsTotalStars extends React.Component {
constructor() {
super();
this.state = {
ratingStars: 3.5
};
}
render() {
return (
<div>
{this.state.ratingStars} works but this {this.props.AvgRating} doesn't
</div>
);
}
}
Thanks for any help and explanations here.
In ReviewsTotalStars you want to access:
this.props.AvgRating
But it is actually:
this.props.avgRating
By the way, you should not have a props that starts with an upper case letter
Should be simple to fix, in react, you should never create vaiables outside of the class you are working on, instead you should add them to the state object, like this:
Index.js:
import React, { Component } from "react";
import { render } from "react-dom";
import ReviewsLeftArea from "./ReviewsLeftArea";
import "./style.css";
// const avgRating = 3.5;
class App extends Component {
constructor() {
super();
this.state = {
name: "React",
avgRating: 3.5;
};
}
render() {
return (
<div>
<ReviewsLeftArea AvgRating={this.state.avgRating} />
</div>
);
}
}
render(<App />, document.getElementById("root"));
ReviewsTotalStars.js:
import React from "react";
export default class ReviewsTotalStars extends React.Component {
constructor() {
super();
this.state = {};
}
render() {
return (
<div>
{this.props.avgRating} //now this should work
</div>
);
}
}

How to use 'Inject' without decorator in Mobx with ReactJs

I wonder how to use Inject without decorator.
First, I made this as Store.
//Data/imagedb
import { decorate, observable } from 'mobx';
class imageStore {
list = {
keyword : 'yoyo',
}
}
decorate(imageStore, {
list: observable,
})
export default imageStore;
Second, I made this code to inject Store on it.
//components/Image
import React, { Component } from 'react';
import { observer, inject } from 'mobx-react';
class Image extends Component {
render() {
const onPut2 = {onPut};
return (
<div>
{onPut2}
</div>
);
}
}
export default inject(({ imSt }) => ({
onPut: imSt.list.keyword,
}))(observer(Image));
And finally, this is my last code.
The error is "Onput is not defined" in second code.
import React from 'react';
import Image from 'components/Image';
import { Provider } from 'mobx-react';
import imageStore from 'Data/imagedb'
const imSt = new imageStore();
const Home = () => {
return (
<div>
<Provider imSt={imSt}>
<Image />
</Provider>
</div>
);
};
export default Home;

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