ReactJS 中 onClick 事件的 TypeScript 接口签名
[英]TypeScript interface signature for the onClick event in ReactJS
问题描述
The official reactjs.org website contains an excellent introductory tutorial.
官方reactjs.org网站包含一个优秀的介绍性教程。
The tutorial snippets are written in JavaScript and I am trying to convert these to TypeScript.教程片段是用 JavaScript 编写的，我正在尝试将它们转换为 TypeScript。
I have managed to get the code working but have a question about using interfaces.我设法使代码正常工作，但对使用接口有疑问。
What should the correct "function signature" be for the onClick callback. onClick 回调的正确“函数签名”应该是什么。
Is there a way to replace the 'any' keyword in the IProps_Square interface with an explicit function signature ?有没有办法用显式函数签名替换 IProps_Square 接口中的“any”关键字？
Any help or suggestions would be really appreciated, many thanks Russell任何帮助或建议将不胜感激，非常感谢罗素
index.html索引.html
<!DOCTYPE html>
<html lang="en">
<body>
<div id="reactjs-tutorial"></div>
</body>
</html>
index.tsx索引.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')
);
2 个解决方案
解决方案1
53 已采纳 2020-04-21 10:19:11
The interface with props should be带有道具的界面应该是
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.另请注意，如果您使用分号，则界面项分隔符是分号，而不是逗号。
解决方案2
6 2019-01-30 04:02:36
Is there a way to replace the 'any' keyword in the IProps_Square interface with an explicit function signature
I would just () => void ie a function that takes no arguments and you don't care if it returns anything.我只是() => void即一个不带参数的函数，你不在乎它是否返回任何东西。
import * as React from 'react';
import * as ReactDOM from 'react-dom';
interface IProps_Square {
message: string,
onClick: () => void,
}
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')
);
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