How to add additional api to a fetch component in React JS - reactjs

There are 2 separate components that fetch data through api. The code below is for the first component and then there is another component that fetch other data of the same company through another api and the code of that one is exactly the same except the api link. How to fetch the data from the other api in this component so there is no need for 2 different components.
import React, { Component, Fragment } from 'react'
import axios from 'axios'
class CompanyProfile extends Component {
constructor(){
super();
this.state={
Company:[]
}
}
componentDidMount(){
axios.get('http://localhost:3000/link').then(response =>{
**/////////for example axios.get('http://localhost:3000/link2') added here.**
this.setState({Company:response.data});
});
}
render() {
const cp = this.state.Company;
const CompanyView = contact.map((cp,i)=>{
**/////then mapped here.**
return <div>
<p>{cp.name}</p>
<p>{cp.type}</p>
<p>...other data</p>
**//// and then displayed here <p>{cp.CompanyProducts.data}</p>**
</div>
});
return (
<div>
{CompanyView}
</div>
)
}
}
export default CompanyProfile

I am not sure about your question. We can use container and presentational components.
A container does data fetching and then renders its corresponding sub-component. That’s it.
Refactor the CompanyProfile component to a stateless presentational component. Pass the company data from the remote API server to it from the container component.
So that we can reuse the CompanyProfile component.
CompanyProfile.jsx:
import React, { Component } from 'react';
class CompanyProfile extends Component {
render() {
const { campany } = this.props;
const CompanyView = campany.map((cp, i) => {
return (
<div>
<p>{cp.name}</p>
<p>{cp.type}</p>
<p>...other data</p>
<p>{cp.CompanyProducts.data}</p>
</div>
);
});
return <div>{CompanyView}</div>;
}
}
export default CompanyProfile;
Parent1.tsx:
import React, { Component } from 'react';
import axios from 'axios';
import CompanyProfile from './CampanyProfile';
export default class Parent extends Component {
constructor(props) {
super(props);
this.state = {
company: [],
};
}
componentDidMount() {
axios.get('http://localhost:3000/link').then((response) => {
this.setState({ company: response.data });
});
}
render() {
return <CompanyProfile company={this.state.company} />;
}
}
Parent2.jsx:
import React, { Component } from 'react';
import axios from 'axios';
import CompanyProfile from './CampanyProfile';
export default class Parent2 extends Component {
constructor(props) {
super(props);
this.state = {
company: [],
};
}
componentDidMount() {
axios.get('http://localhost:3000/link2').then((response) => {
this.setState({ company: response.data });
});
}
render() {
return <CompanyProfile company={this.state.company} />;
}
}

Related

React Redux: Why is this nested component not receiving props from redux state?

I've got a parent component Course that is able to get state from redux and I'm able to log that out successfully:
import React, { Component } from "react";
import { connect } from "react-redux";
import SchoolWrapper from "../SchoolWrapper";
export class Course extends Component {
constructor(props) {
super(props);
console.log("Props in course", props);
}
render() {
return (
<>
<SchoolWrapper>Wrapped component</SchoolWrapper>
</>
);
}
}
const mapStateToProps = (state) => ({
user: state.user,
});
export default connect(mapStateToProps)(Course);
Nested in the Course component is another component SchoolWrapper that is able to get props from redux state:
import React, { Component } from "react";
import { connect } from "react-redux";
import { Nav } from "./Student/Nav";
export class SchoolWrapper extends Component {
constructor(props) {
super(props);
console.log("SchoolWrapper props", props);
}
render() {
return (
<>
<Nav />
</>
);
}
}
const mapStateToProps = (state) => ({
user: state.user,
});
export default connect(mapStateToProps)(SchoolWrapper);
However, the Nav component or any other component nested at this level is not able to access state from redux.
import React, { Component } from "react";
import { connect } from "react-redux";
export class Nav extends Component {
constructor(props) {
super(props);
console.log("Nav props: ", props);
}
render() {
return (
<div>
nav goes here...
</div>
);
}
}
const mapStateToProps = (state) => ({
user: state.user,
});
export default connect(mapStateToProps)(Nav);
Where am I going wrong?
I think you're importing Nav wrong, here you're using a "default" export:
export default connect(mapStateToProps)(Nav);
But you try to use a "named" import:
import { Nav } from "./Student/Nav";
Nav should be imported as a "default":
import Nav from "./Student/Nav"

The data that comes from an API end point is undefined in the child component in React

Good day to all!
I have this situation: I use Apollo client to get data from a GraphQL API endpoint in the parent class component in React. I pass this data to the child class component. The first time everything works fine but after a page refresh the data in the child component becomes undefined and the app crashes.
Here is the representation of the situation:
The ParentComponent
import React, { Component } from 'react'
import { gql } from "apollo-boost";
import {graphql} from 'react-apollo';
import ChildComponent from './ChildComponent'
const getProducts = gql`
{
category {
products {
id
name
gallery
}
}
}
`
class ParentComponent extends Component {
constructor(props) {
super(props)
this.state = {
products: []
}
}
componentDidMount() {
setTimeout(() => {
this.setState({
products: [...this.props.data.category.products]
})
}, 1000)
}
render () {
let products = this.state.products;
return (
<div><ChildComponent theProducts = {products}/></div>
)
}
}
export default graphql(getProducts)(ParentComponent);
The ChildComponent
import React, { Component } from 'react'
class ChildComponent extends Component {
constructor(props) {
super(props)
this.state = {
products: this.props.theProducts
}
}
render () {
let item = this.state.products.find(each => each.id === id);
return (
<div>
<ul>
<li>{item.name}</li>
<li><img src= {item.gallery[0]} alt="product"></img></li>
</ul>
</div>
)
}
}
export default ChildComponent;
So, when the app starts everything seems to work fine. But if I refresh the page it throws an error and says that name is undefined, gallery is undefined. It is clear that the data is not coming through to the ChildComponent. Is there a way to make sure that the data comes in at any time?
Thank you in advance.
You use theProducts in the ChildComponent but you pass theProduct from ParentComponent . And state product also has the same error. Just update to theProducts and product

Getting props via state object

I am trying to get props via state object.
import React, { Component } from 'react';
import Counter from './counter';
class Counters extends Component {
state = {
counters: [
{id:1, value:1},
{id:2, value:2},
]
};
render() {
return(
<div>
this.state.counters.map(counter => (
<Counter key={counter.id} value={counter.value}/>))}
</div>)
}
}
export default Counters;
import React, { Component } from 'react';
class Counter extends Component {
state = {
value: this.props.value
};
constructor(){
super();
}
render() {
console.log(this.props);
return (
<div>
</div>
);
}
}
export default Counter;
Why can't I get props within state object? I am seeing props in render.
I am getting TypeError: Cannot read property 'value' of undefined.
Can someone show me how to pass props correctly to the state object. I have seen props passed this way by other coders.
Thanks,
Rob.
You need to pass props to super and define the state in the constructor or remove the constructor and use state directly.
CODESANDBOX
import React, { Component } from "react";
class Counter extends Component {
constructor(props) {
super(props);
this.state = {
value: this.props.value
};
}
render() {
console.log(this.props);
return <div>{this.state.value}</div>;
}
}
export default Counter;
or CODESANDBOX
import React, { Component } from "react";
class Counter extends Component {
state = {
value: this.props.value
};
render() {
console.log(this.props);
return <div>{this.state.value}</div>;
}
}
export default Counter;

what is best way to get props in React / React Native

I'm really regarding props in React/React-Native. I have a parent view. In this view I'm getting the user data from a LocalStorage.['
import React, { Component } from 'react';
import { Container, Content, View } from 'native-base';
import NutrionalToolbar from '../../components/NutrionalToolbar';
import { AsyncStorage } from 'react-native';
export default class LogsScreen extends Component {
state = {
user: '',
}
componentWillMount() {
this._bootstrapAsync();
}
_bootstrapAsync = async () => {
const user = await AsyncStorage.getItem('user');
this.setState({ user: JSON.parse(user) })
};
render() {
return (
<Container>
<NutrionalToolbar user={this.state.user} />
</Container>
);
}
}
Now inside the NutrionalToolbar component I have this.
import React, { Component } from 'react';
import { View } from 'native-base';
class NutrionalToolbar extends Component {
constructor(props) {
super(props)
console.log(this.props) // This renders an empty user object
}
render() {
console.log(this.props) // This renders the user object with values
return (
<View>
</View>
);
}
}
export default NutrionalToolbar;
How can I get this.props values inside the constructor. I'm getting the values inside render method. Why isn't working inside the constructor?
I would recommend looking into the componentDidUpdate lifecycle hook because, even if you could access the initial user prop in the constructor, you wouldn't be able to access updates to that prop in the constructor.
import React, { Component } from 'react';
import { View } from 'native-base';
class NutrionalToolbar extends Component {
componentDidUpdate() {
console.log(this.props) // This will always log the current props
}
render() {
return (<View></View>);
}
}
export default NutrionalToolbar;

How to use map on multi objects array in React

This is child component as i can you Props here
Child Component:
import React from "react";
const PeopleList = props => {
console.log("child Props :", props.data);
const list = props.data.map(item => item.name);
return <React.Fragment>{"list"}</React.Fragment>;
};
export default PeopleList;
Main Component:
import React, { Component } from "react";
import { connect } from "react-redux";
import { fetchPeople } from "../actions/peopleaction";
import PeopleName from "../containers/peopleName";
class Main extends Component {
constructor(props) {
super(props);
this.state = {};
}
componentDidMount() {
this.props.dispatch(fetchPeople());
}
render() {
const { Error, peoples } = this.props;
console.log("data", peoples);
return (
<div className="main">
{"helo"}
<PeopleName data={peoples.results} />
</div>
);
}
}
const mapStateToProps = state => {
return {
peoples: state.peoples.peoples,
error: state.peoples.error
};
};
export default connect(mapStateToProps)(Main);
If i iterate the props multi objects array i can face Map is not define issue;
I need to iterate the props.data multi objects array in child component and i get object from Redux store. once component loaded the redux store.
can you please some one help me on this.
you can find whole code below mentioned
Try this It works in your codesandbox.
{peoples.results && <PeopleName data={peoples.results} />}

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