带有 React Bootstrap 的 TypeScript 可重用表单

Question

我正在关注这篇文章以学习反应和打字稿形式。有一个可重用的表单，其中解释了 React Bootstrap，我喜欢实现它。我试图通过编写如下的用户表单来做到这一点。但是我明白了TS7031：绑定元素“取消”隐式具有“任意”类型一旦我解决了这个错误，我就不知道如何使用它了。例如，如果我想实现一个登录表单和一个登录表单，我该如何参考下面的用户表单import React from 'react';import Form from 'react-bootstrap/Form';import Button from 'react-bootstrap/Button';import styled from 'styled-components';const UserForm =    ({        cancel,        errors,        submit,        submitButtonText,        elements,        passwordErrors    }) => {    function handleSubmit(event) {        event.preventDefault();        submit();    }    function handleCancel(event) {        event.preventDefault();        cancel();    }    return (        <React.Fragment>            <ErrorsDisplay errors={errors} passwordErrors={passwordErrors} />            <Form onSubmit={handleSubmit}>                {elements()}                <Button className="mr-1" variant="primary" type="submit">{submitButtonText}</Button>                <Button className="mr-1" variant="secondary" onClick={handleCancel}>Cancel</Button>            </Form>        </React.Fragment>    ); };function ErrorsDisplay({ errors, passwordErrors}) {    let errorDisplay = null;    if (errors.length) {        errorDisplay = (            <React.Fragment>                <ValidiationLabel>Errors:</ValidiationLabel>                <ValidiationUl>                    {errors.map((error, i) => (                        <li key={i}>{error}</li>                    ))}                </ValidiationUl>            </React.Fragment>        );    } else if (!passwordErrors) {        errorDisplay = (            <React.Fragment>                <ValidiationLabel>Errors:</ValidiationLabel>                <ValidiationUl>{<li>Passwords must match</li>}</ValidiationUl>            </React.Fragment>        );    }    return errorDisplay;}

Answer 1

首先，假设您正在使用您所说的 typescript 项目（.tsx 文件扩展名），您需要为 UserForm 输入参数：

// This is just an example, not necessary needs to be this exactly types for the parameters

interface UserFormProps {

  cancel(): void; // cancel is a function that returns nothing

  submit(): void;

  errors: string[]; // errors its an array of strings

  passwordErrors: boolean;

  submitButtonText: string;

  elements(): ReactNode; // elements its a funtion that returns react nodes

}

// Here you are destructuring the object parameter of UserForm function.

// You telling it that its an UserFormProps Type Object on ": UserFormProps"

const UserForm = ({

  cancel,

  submit,

  elements,

  errors,

  submitButtonText,

  passwordErrors,

}: UserFormProps) => { .....

对于 ErrorsDisplay 函数：

interface ErrorsProps {

  errors: string[];

  passwordErrors: boolean;

}

function ErrorsDisplay({ errors, passwordErrors }: ErrorsProps) {...

对于句柄函数，您需要指定事件类型：

// You are saying the handleSubmit function receives an FormEvent from a HTML Form Element

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

// You are saying the handleCancel function receives an MouseEvent from a HTML Button Element

function handleCancel(event: React.MouseEvent<HTMLButtonElement>) { ....

完成此操作后，您可以在任何地方使用您的用户窗体，例如您的登录页面/登录页面。

你只需要导入它：

import React from "react";

import Form from "react-bootstrap/Form";

// here you need to inform the path according to your project

import UserForm from "./UserForms";

const SignIn = () => {

  return (

    <UserForm

      // I'm setting the values hardcoded just as example

      cancel={() => {console.log('cancel')}}

      submit={() => {console.log('submit')}}

      errors={[]}

      passwordErrors={false}

      submitButtonText="test"

      elements={() => (

        <>

          <Form.Group controlId="ControlId">

            <Form.Control

              type="email"

              name="email"

              value={"[e-mail]"}

              placeholder={"email"}

            ></Form.Control>

            <Form.Control

              type="password"

              name="password"

              value={"password"}

              placeholder={"password"}

            ></Form.Control>

          </Form.Group>

        </>

      )}

    ></UserForm>

  );

};

export default SignIn;