two way binding react

import React, { useState } from “react”;
import Child from “./Child”;
function Parent(props) {
const [text, setText] = useState(“Hello”);
return (
<div>
<h1>{text}</h1>
<Child changeText={(text) => setText(text)} />
</div>
);
}
export default Parent;



import React from “react”;
function Child(props) {
return (
<div>
<button onClick={() => props.changeText(“World”)}>
Change the text
</button>
</div>
);
}
export default Child;

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0

5

Tairoc 95 points

                                    In our case, it is easy to identify that the state should reside in the &ldquo;Parent&rdquo; component.

const [text, setText] = useState(&ldquo;Hello&rdquo;);

Now, what do we do to the &ldquo;Parent&rdquo; component? We pass the callback function as a prop from the parent component.

&lt;Child changeText={(text) =&gt; setText(text)} /&gt;

Now we need a callback function in the &ldquo;Child&rdquo; component that is triggered when the button is clicked.

&lt;button onClick={() =&gt; props.changeText(&ldquo;World&rdquo;)}&gt;

Thank you! 5

0

0

4.5

8

John 100 points

                                    class App extends React.Component {
  constructor() {
    super();
    this.state = {value : ''}
  }
  handleChange = (e) =&gt;{ 
    this.setState({value: e.target.value});
  }
  render() {
    return (
    &lt;div&gt;
        &lt;input type=&quot;text&quot; value={this.state.value} onChange={this.handleChange}/&gt;
        &lt;div&gt;{this.state.value}&lt;/div&gt;
    &lt;/div&gt;
   )
  }
}
ReactDOM.render(&lt;App/&gt;, document.getElementById('app'));

Thank you! 8

4.5 (8 Votes)

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