event 用 ts 类型声明

yqcoder2024-12-15 21:32

一、DOM 事件类型声明示例

1. 鼠标点击事件（`MouseEvent`）

使用 React.MouseEvent<HTMLButtonElement> 定义

javascript 复制代码

import React from "react";



const MyComponent: React.FC = () => {

  const handleClick = (event: React.MouseEvent<HTMLButtonElement>) => {

    // 这里可以访问MouseEvent的相关属性，比如获取鼠标点击的坐标

    console.log("Client X:", event.clientX);

    console.log("Client Y:", event.clientY);

  };



  return <button onClick={handleClick}>Click Me</button>;

};



export default MyComponent;

2. 键盘输入事件（`KeyboardEvent`）

使用 React.KeyboardEvent<HTMLInputElement> 定义

javascript 复制代码

import React from "react";



const MyComponent: React.FC = () => {

  const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => {

    if (event.key === "Enter") {

      console.log("用户按下了回车键");

    }

  };



  return <input onKeyDown={handleKeyDown} placeholder="请输入内容" />;

};



export default MyComponent;

3. 表单提交事件（`FormEvent`）

使用 React.FormEvent<HTMLFormElement> 定义

javascript 复制代码

import React from "react";



interface FormData {

  username: string;

  password: string;

}



const MyComponent: React.FC = () => {

  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {

    event.preventDefault();

    const formData: FormData = {

      username: (

        event.currentTarget.elements.namedItem("username") as HTMLInputElement

      ).value,

      password: (

        event.currentTarget.elements.namedItem("password") as HTMLInputElement

      ).value,

    };

    console.log("提交的表单数据:", formData);

  };



  return (

    <form onSubmit={handleSubmit}>

      <input type="text" name="username" placeholder="用户名" />

      <input type="password" name="password" placeholder="密码" />

      <button type="submit">提交</button>

    </form>

  );

};



export default MyComponent;