Pass event through nested components bottom to top

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While this question has been asked before I did not find an answer. I have components nested to the level of great grandchild and I don't know how to get the data from the bottom to the top.

<Parent/>
  <Child/>
    <GrandChild/>
      <GreatGrandChild/>

See an example: fiddle

The great grandchild is a form and I want the input data to get to the parent at the top. I had it working when it was just nested one level deep, but now that it is deeply nested it does not work. I'm not sure how to even pass the event up two levels.

I've heard using redux is possible but I wonder if there is a way to avoid it. Or, how do I avoid the nesting? Even through they are all actually separate components should I just move them into one big component? This might work but seems like bad practice?


Very simplified, you could just pass the function through all the components:

class GreatGrandChild extends React.Component {
  render() {
    return (
      <div>
      <input onChange={this.props.onChange}/>
        <h2>I'm the GreatGrandChild</h2>
      </div>
    )
  }
}

class GrandChild extends React.Component {
  render() {
    return (
      <div>
        <h2>I'm the GrandChild</h2>
        <GreatGrandChild onChange={this.props.onChange}/>
      </div>
    )
  }
}

class Child extends React.Component {
  render() {
    return (
      <div>
      <GrandChild onChange={this.props.onChange}/>
        <h2>I'm the child</h2>
      </div>
    )
  }
}
class Top extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    }
  }

  handleChildchange = (e) => {
    console.log('child event on parent')
    console.log(e.target.value);
  }
  render() {
    return (
      <div>
       <Child onChange={this.handleChildchange}/>
        <h2>I'm the parent</h2>
      </div>
    )
  }
}

ReactDOM.render(<Top />, document.querySelector("#app"))

Nested components in React; How to render a child component , Meaning we could never pass props from child to parent component. passing data and events between child and parent components of passing props from top to bottom or from parent to child components in React. React Router uses a declarative, component-based approach to routing. What that means is when you want to create a new route, you render a Route component. If you’re familiar with React Router you know that to do that, you pass Route a path and a component to render when the app’s location matches that path.


Redux is overkill for simple passing of props. You can pass props down through each child but it's easier to use the Context API like so:

Parent Component:
const MyContext = React.createContext('default');
export MyContext;

class Parent extends React.Component {
    myFunction() {
        //Do something here
    }

    render() {
         return (
            <MyContext.Provider value={this.myFunction}>
                <ChildComponent />
            </MyContext.Provider>
         );
    }
}

export default Parent;
Child Component:
import { MyContext } from './Parent';

class ChildComponent extends React.Component {
    render() {
        const { myFunction } = this.context;
        return (
            <div onClick={myFunction}>Click Me!</div>
        );
    }
}

ChildComponent.contextType = MyContext;

You can use the context as deep as you'd like, as long as you import it.

Bubbling and capturing, Let's say we have 3 nested elements FORM > DIV > P with a handler on each of them: A bubbling event goes from the target element straight up. event object in one handler and read it in another one, so we can pass to so on till the very top element that handles general concepts and runs the last. While render functions allow components to pass data to their immediate children, React’s context API lets components pass data to deeply nested descendants. In fact, the context API itself uses render functions.


Simply pass a callback down from the parent via the props and make Sure it's passed all the way down to where you need it.

How to pass values across Lightning components?, And the bar component, but let's add a button to change the value when the components themselves decoupled and leaves it up to the container using we can set the Top most component attribute from the nested component? Alternatively you can use Events to pass attribute values between components if you need  Pass event handlers and other functions as props to child components: < button onClick = { this . handleClick } > If you need to have access to the parent component in the handler, you also need to bind the function to the component instance (see below).


You also can pass props to your each child component in nesting and whenever values changed, you can call a parent function (nested) to get latest values in parent.

Night Sky With the Naked Eye: How to Find Planets, Constellations, , That's caused by refraction or the bending of light by Earth's atmosphere. We look through air at the top half of the pencil and through water at the bottom half. shapes caused by the varied layers of air the moon's light must pass through as it Earth's shadow is composed of two nested components—the inner umbra,​  Since these 2 components are independent and events only travels up the DOM, they need to communicate through the global scope so listeners need to use the window modifier in order to work. Example 2 (nested components)


How to pass data to a React component's props.children, But what if those children need to receive data from the component React's context API lets components pass data to deeply nested descendants. by cloning it and adding a className prop with the value top bottom , as so. elements; function components; events; hooks; class components; and more. The most deeply nested element that caused the event is called a target element, accessible as event.target. Note the differences from this (=event.currentTarget): event.target – is the “target” element that initiated the event, it doesn’t change through the bubbling process.


Event Bubbling and Event Capturing in JavaScript, There are two ways Top to Bottom(Event Capturing) and other one is Bottom to Top In the HTML, we can create a div with id parent. and its nested button element with id child. Event not pass from event target to document of webpage​. React Tips — Component Organization and Web Components. So we build a VueJS app, that had a component structure and we passed props through it. Then we also explored the basics of VueJS directives and also created nested components. My readers can try implementing props on nested components and customize each of the Image Tags as a takeaway assignment.


Is it possible to emit event from component inside slot · Issue #4332 , Jump to bottom purepear changed the title Events emitted from slot components are not do if I could pass JSON over and make the HTML above into a component using v-for Navbar component: Navbar.vue - which is the highest parent Then no matter how many levels down this markup happens to be in nested  When a routed event bubbles through its event route, any attached event handlers all access a shared instance of event data. Therefore, if any of the event data is writeable by a handler, any changes made to event data will be passed on to the next handler, and may no longer represent the original event data from the event.