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I have two components App and SomeComponent.

I want to get access variable in App from SomeComponent.

App:

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

var places = [];

class App extends Component {

  state = {isLoading:true}
   render(){
bla-bla...}
}

export default App;

SomeComponent:

import React from 'react'
import App from '../App'

class SomeComponent extends React.Component {
  componentDidMoint(){
    console.log('Check access places array',App.places)
  }
  render(){
    bla-bla...

  }
}

export { SomeComponent }

But its coughed out places is Undefined, instead of show empty array. Whats wrong here ? Yes, I've tried different variants... but no success. Thanks!

you need to export place from App

export const places = [];

And also in child.app

import React from 'react'
import { places } from '../App'

class Child extends React.Component {
  componentDidMoint(){
    console.log('Check access places array',places)
  }
  render(){
    bla-bla...

  }

Access variable from one component into another, If such a relation between the components doesnt exist (for example routed components), then the most common option is to create a service� In short, it creates a centralized data store that is accessible by all components. In the methods we used previously (props / emitting events), each component has its own data state that we then share between components. However, Vuex lets us extract all the shared data into a single state that each component can access easily.

The way to pass data from a parent component to a child component in React is through props. You can e.g. pass the array as the places prop to your Child component and access it from this.props.

Example

class App extends React.Component {
  state = { isLoading: true, places: ['foo', 'bar'] }

  render() {
    return <Child places={this.state.places} />
  }
}

class Child extends React.Component {
  componentDidMount() {
    console.log('Check access places array', this.props.places)
  }
  render() {
    return <div>Child</div>
  }
}

ReactDOM.render(<App />, document.getElementById("root"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

<div id="root"></div>

Sharing Data between Angular Components, Sharing Data between Angular Components - Four Methods ViewChild allows a one Duration: 5:19 Posted: Apr 20, 2017 Create Two Blazor Components. To demonstrate the passing of values between two Blazor components on the same page, I have created two Razor Component items, InputComponent.razor and DisplayComponent.razor. These files are located them in a Components folder in my project. InputComponent.razor

Don't import App into Child. In App, use React's render method with JSX to declare an instance of child. In App's Child JSX, the attributes will become available as "props" within Child. See https://reactjs.org/docs/components-and-props.html React expects a programmatic structure that's not as "free" as straight JS, but React then provides a concise, integrated way to make widgets and SPAs.

Sharing Data between Angular Components, Sharing Data between Angular Components Child component now has access to the value of “parentMessage” from the parent component. In the service, we create a private Subject variable “myMessage” that will hold� Using variables, business data is passed between process application components at run time. Depending on the components that are involved, the data is passed either by value or by reference. Variables capture business data. If the business data is a simple type (for example, a String) then the variable contains a value of the business data.

Sharing Data between Components in Angular, In the AfterViewInit function we can access the message variable defined in the child. Child to Duration: 5:19 Posted: Apr 30, 2017 Passing Variables Between Components In React.js. Ask Question Asked 3 years, So React's state allows you to access variables throughout your component.

Sharing Data Between Angular Components, Data sharing between components is an essential knowledge that and in the child component, we declare a messageEvent variable with the� How to communicate between components? This is the topic I saw many new Angular developers to struggle with. I will show you 3 most common approaches with examples that fits different use cases.

Passing Data Between React Components, If I have access to data in my parent component that I need my child Component { render() { [ somewhere in here I define a variable� Passing data between React components can be a little tricky at first (without using Redux that is), but once you practice these three techniques you’ll be able to pass data between whichever

Comments
  • Ok. But this string: export var places = []; You assign empty value. I actually need get current value of places when I'll call this places.
  • if your places change in run time and also need to pass to child component, you should pass that as props of that child component.
  • I just tested your suggestion... both of them: export var places = []; and *export var places * - the same undefined
  • add some value to places like export var places = ['London','Paris']; like something, then you will able to do that.
  • Nope. Just tested. the same - Undefined
  • Sorry. I know about props. I was wrong in questions. I need transfer data between components that not relation parent-child but like next each other.
  • @kd Ah, I see. Have you tried putting the places array in a third separate module, and import that third module into your App and Child files?