Issue
The official reactjs.org website contains an excellent introductory tutorial.
The tutorial snippets are written in JavaScript and I am trying to convert these to TypeScript.
I have managed to get the code working but have a question about using interfaces.
What should the correct "function signature" be for the onClick callback.
Is there a way to replace the 'any' keyword in the IProps_Square interface with an explicit function signature ?
Any help or suggestions would be really appreciated, many thanks Russell
index.html
<!DOCTYPE html>
<html lang="en">
<body>
<div id="reactjs-tutorial"></div>
</body>
</html>
index.tsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
interface IProps_Square {
message: string,
onClick: any,
}
class Square extends React.Component < IProps_Square > {
render() {
return (
<button onClick={this.props.onClick}>
{this.props.message}
</button>
);
}
}
class Game extends React.Component {
render() {
return (
<Square
message = { 'click this' }
onClick = { () => alert('hello') }
/>
);
}
}
ReactDOM.render(
<Game />,
document.getElementById('reactjs-tutorial')
);
Solution
The interface with props should be
interface IProps_Square {
message: string;
onClick: React.MouseEventHandler<HTMLButtonElement>;
}
Notice also that if you use semicolons, the interface items separator is a semicolon, not a comma.
Answered By - Gianluca Casati
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