在 React 和 React Native 中为正则表达式验证创建自定义输入-js教程-PHP中文网

在 React 和 React Native 中为正则表达式验证创建自定义输入

Mary-Kate Olsen

发布： 2025-01-13 11:14:44

原创

553 人浏览过

Creating Custom Inputs for Regex Validation in React and React Native

验证是表单处理的一个关键方面，确保用户输入遵守特定规则。在本文中，我们将使用电话号码、信用卡和 CVC 等示例，探索如何通过 React 和 React Native 的正则表达式验证创建可重用的自定义输入组件。

链接

源代码
现场演示

为什么要自定义输入？

使用自定义输入可以让您：

标准化跨表单的验证逻辑。
通过输入掩码和清晰的错误消息增强用户体验。
在 React 和 React Native 中重用组件。

入门

先决条件

确保您安装了以下依赖项：

用于表单处理的react-hook-form。
zod 和 @hookform/resolvers/zod 用于基于模式的验证。
react-native-mask-input 用于 React Native 中的屏蔽输入。
用于样式化的样式化组件。

npm install react-hook-form zod @hookform/resolvers zod react-native-mask-input styled-components

登录后复制

自定义输入组件

这是可重用的 StyledInput 组件：

React Native 代码

import React from "react";
import {
  Controller,
  FieldPath,
  FieldValues,
  useFormContext,
} from "react-hook-form";
import { TextInputProps, View } from "react-native";
import styled from "styled-components/native";

const InputContainer = styled.View`
  width: 100%;
`;

const Label = styled.Text`
  font-size: 16px;
  color: ${({ theme }) => theme.colors.primary};
`;

const InputBase = styled.TextInput`
  flex: 1;
  font-size: ${({ theme }) => `${theme.fontSizes.base}px`};
  color: ${({ theme }) => theme.colors.primary};
  height: ${({ theme }) => `${theme.inputSizes.base}px`};
  border: 1px solid ${({ theme }) => theme.colors.border};
  border-radius: 8px;
  padding: 8px;
`;

const ErrorMessage = styled.Text`
  font-size: 12px;
  color: ${({ theme }) => theme.colors.error};
`;

interface StyledInputProps<TFieldValues extends FieldValues>
  extends TextInputProps {
  label: string;
  name: FieldPath<TFieldValues>;
}

export function StyledInput<TFieldValues extends FieldValues>({
  label,
  name,
  ...inputProps
}: StyledInputProps<TFieldValues>) {
  const { control, formState } = useFormContext<TFieldValues>();
  const { errors } = formState;
  const errorMessage = errors[name]?.message as string | undefined;

  return (
    <InputContainer>
      <Label>{label}</Label>
      <Controller
        control={control}
        name={name}
        render={({ field: { onChange, onBlur, value } }) => (
          <InputBase
            onBlur={onBlur}
            onChangeText={onChange}
            value={value}
            {...inputProps}
          />
        )}
      />
      {errorMessage && <ErrorMessage>{errorMessage}</ErrorMessage>}
    </InputContainer>
  );
}

登录后复制

反应代码

应用相同的逻辑，但将 TextInput 替换为 HTML 的并相应地设置样式。

使用 zod 添加正则表达式验证

为电话号码和信用卡等输入定义掩码和验证器：

import * as zod from "zod";
import { Mask } from "react-native-mask-input";

const turkishPhone = {
  mask: [
    "+",
    "(",
    "9",
    "0",
    ")",
    " ",
    /\d/,
    /\d/,
    /\d/,
    " ",
    /\d/,
    /\d/,
    /\d/,
    "-",
    /\d/,
    /\d/,
    "-",
    /\d/,
    /\d/,
  ],
  validator: /^\+\(90\) \d{3} \d{3}-\d{2}-\d{2}$/,
  placeholder: "+(90) 555 555-55-55",
};

const creditCard = {
  mask: [
    /\d/,
    /\d/,
    /\d/,
    /\d/,
    "-",
    /\d/,
    /\d/,
    /\d/,
    /\d/,
    "-",
    /\d/,
    /\d/,
    /\d/,
    /\d/,
    "-",
    /\d/,
    /\d/,
    /\d/,
    /\d/,
  ],
  validator: /^\d{4}-\d{4}-\d{4}-\d{4}$/,
  placeholder: "4242-4242-4242-4242",
};

const cvc = {
  mask: [/\d/, /\d/, /\d/],
  validator: /^\d{3}$/,
  placeholder: "123",
};

const schema = zod.object({
  phone: zod.string().regex(turkishPhone.validator, "Invalid phone number"),
  creditCard: zod
    .string()
    .regex(creditCard.validator, "Invalid credit card number"),
  cvc: zod.string().regex(cvc.validator, "Invalid CVC"),
});

登录后复制

构建表单

使用react-hook-form和zod进行验证：

import { FormProvider, useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";

export default function FormScreen() {
  const form = useForm({
    resolver: zodResolver(schema),
    mode: "onBlur",
  });

  return (
    <FormProvider {...form}>
      <StyledInput
        name="phone"
        label="Phone"
        placeholder={turkishPhone.placeholder}
      />
      <StyledInput
        name="creditCard"
        label="Credit Card"
        placeholder={creditCard.placeholder}
      />
      <StyledInput name="cvc" label="CVC" placeholder={cvc.placeholder} />
      <button type="submit">Submit</button>
    </FormProvider>
  );
}

登录后复制