Stack Overflow Asked by Fahd Dev on November 4, 2021
Hi Im just learning react
I’ve small problem
I want to learn how to pass state data to its Child as props
Here’s me code
App.js
import React from "react";
import Clock from "./Clock";
import Test from "./Test";
import "./App.css";
function App() {
return (
<div className="App">
<Clock />,
<Test />
</div>
);
}
export default App;
Clock.js
import React from "react";
import Test from "./Test";
class Clock extends React.Component {
state = {
date: new Date(),
};
componentDidMount() {
this.timerID = setInterval(() => this.tick(), 1000);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState({
date: new Date(),
});
}
render() {
return (
<div>
<h1>Hello, world!</h1>
<h2>It is {this.state.date.toLocaleTimeString()}.</h2>
<h3> Time Now</h3>
<Test date={this.state.date} />
</div>
);
}
}
export default Clock;
Here’s the Child component I want to pass the state I named it test
import React, { Component } from "react";
export class Test extends Component {
render() {
return (
<div>
<p>{this.props.date.toLocaleTimeString()}</p>
</div>
);
}
}
export default Test;
I got this error >>
TypeError: Cannot read property ‘toLocaleTimeString’ of undefined
date undefined although I gave its parent props
Please I need help
thanks in advanced
You've passed props perfectly in Clock.js
however in App.js
you are not passing date
as a prop to <Test />
which is why you're getting the above error.
Answered by Pranav on November 4, 2021
I guess you are seeing the error because of Test
Instance used in App.js
. You are not passing in data over there. Removing it from there may get rid of error.
App.js
import Clock from "./Clock";
import "./App.css";
function App() {
return (
<div className="App">
<Clock />
</div>
);
}
export default App;
Answered by Yash Joshi on November 4, 2021
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