Update a prop in a child component after an event in parent component?

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Take 2 components:

ParentComponent ChildComponent

ParentComponent sets up ChildComponent within render:

render() {
    return (
        <ChildComponent x='default value' />
    )
}

Then, ParentComponent wants to change x='default value' to 'hello', maybe in response to an onClick event.

My confusion I think is, I know how to set up the initial variable x, but not how to change it later on.


You can manage this in Parent state and then pass the state value as a prop to Child.

Child Component.

const ChildComponent = props => {
   return <div>{props.x}</div>;
};

Parent Component

class Parent extends Component {
  constructor(props) {
    super(props);
    this.state = {
       x: "default value"
    };
}

changeX = x => {
   this.setState({
      x: x
   });
};

render() {
  return (
    <div>
     <ChildComponent x={this.state.x} />
     <button
        onClick={() => {
          this.changeX("x");
       }}
     >
       Change X
     </button>
    </div>
   );
 }
}

Here is the codepen.

How to update parent state from child component in React, props.children}. How would <parent> be notified? Is there an event bubbling pattern or some such way for <parent> to be notified the "  To achieve the child-parent communication, you can send a function as a Prop to the child component. This function should do whatever it needs to in the component e.g change the state of some property. Consider the following Parent component:


Lift your state up to your Parent and pass it to Child via props

const Parent = () =>{
    const [title, setTitle] = useState('foo')

    return(
        <>
            <Child title={title} />
            <button onClick={() => setTitle('bar')}>Change to bar</button>
        </>
    )
}

const Child = ({ title }) => <div>{title}</div>

For class based components

class Parent extends React.Component {
    state = { title: 'foo' }

    render() {
        const { title } = this.state
        return (
            <>
                <button onClick={() => this.setState({ title: 'bar' })}>Change to bar</button>
                <Child title={title} />
            </>
        )
    }
}

class Child extends React.Component {
    render() {
        const { title } = this.props
        return <div>{title}</div>
    }
}

How to Pass Props Object from Child Component to Parent , pass a props object from a child component to a parent component. they haven't yet updated the API for React class based components. Perhaps there's a way to bind the component to the event? UPDATE – 9/1/2015. After using React for over a year, and spurred on by Sebastien Lorber's answer, I've concluded passing child components as arguments to functions in parents is not in fact the React way, nor was it ever a good idea. I've switched the answer.


I'll write here an example of the parent component, hopefully it will solve your problem:


const y = 'hello';

const handleClick = () => {
   y= 'there'
}

render() {
   return(
      <div>
        < Child x={y} />
        <button onClick={handleClick} />
      </div>
   ) 
}

In first load, Child component {x} holds 'hello', After click it gonna hold 'there' <

How to Pass, Access & Update Parent State from Child Components , How to Pass, Access & Update Parent State from Child Components in React The parent component displays an HTML table of data which gets retrieved from a PHP API backend You can send the state of the parent component as a prop to the child component: handleFormSubmit( event ) { event. So what I do is pass a function from the parent to the child called updateFilter(). If the filter component has an update in state, it calls up to the parent and runs updateFilter(). One of the values updated is included in a useEffect() dependency array, so the parent then requests the new data with the new filters.


Updating Parent Component State from Children Components in , Many people wonder how to make variables in a child component available in a parent. If we can only pass props down from the parent to the  React hooks are introduced in React 16.8. If you are familiar with the class components then there is no difference to change the parent component state from child component. In both cases, you have to pass the callback function to the parent. Let’s take a very simple example to understand it. We will take two components, Parent and Child.


How to access childs state from parent component in React, The best way to access child state from a parent component is through callback The method above covers how to pass the child state over a click event. provided a prop called onChange() , and if so, pass the updated child component state object. Is there a more recommended way after React state has changed? I am also having a similar issue. Is it normal to have watchers to update local component data() on prop changes. I am coming from React, and component will re-render every time props passed to component are updated. The code I am working on is set up using the extend API.


How correctly update Parent component state in the Child , And then when I click the button in Btns I want to update App state value. How correctly Component { state = { value: null }; handleValue(e) { e. preventDefault(); this.props.value = e.target.name; }; render() { return ( <div  The child component will be responsible for displaying the list of messages on our page. Child components are important if you are reusing code on different parts of the parent component as it allows you to store the code in one place. As a result, it means you can reuse the same code in different areas. With our child component, we are going