javascript - 是的，选择字段（下拉菜单）react-hook-form 上的验证不起作用

Question

我是 ReactJs 的新手，所以我正在使用 react-hook-form 和 Yup 模式验证，我需要验证我的“选择字段”，当我的“选择字段”onChange 时我需要做一些事情。但是模式验证不起作用。For example: when the submit button cliked and the value on "Select field" is null/empty the error message is appear, but when the select field value change to not null/ not empty value, the error message is not disapear, and error消息仍然退出。我的目标是当“选择字段”值不为空时，错误消息就会消失。有人知道怎么修这个东西吗？在此先感谢并为我的英语不好感到抱歉。下面是我的代码和codesandbox中的链接。 代码沙盒

import React from "react";
import ReactDOM from "react-dom";
import { useForm } from "react-hook-form";
import { yupResolver } from "@hookform/resolvers/yup";
import * as yup from "yup";

import "./styles.css";

const SignupSchema = yup.object().shape({
  select: yup.string().required()
});

function App() {
  const {
    register,
    handleSubmit,
    formState: { errors }
  } = useForm({
    mode: "onChange",
    resolver: yupResolver(SignupSchema)
  });
  const onSubmit = (data) => {
    alert(JSON.stringify(data));
  };

  const doSomething = (value) => {
    // do something with my select value onChange
  };

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <div>
        <label>Select</label>
        <select
          {...register("select")}
          onChange={(e) => doSomething(e.target.value)}
        >
          <option value="">Null</option>
          <option value="1">1</option>
          <option value="2">2</option>
        </select>
        {errors.select && <p>{errors.select.message}</p>}
      </div>
      <input type="submit" />
    </form>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

标签： javascriptreactjsreact-hooksyupreact-hook-form

Answer 1

您可以使用触发器触发手动验证，也可以设置值和触发器验证

设置值和触发验证

import React from "react";
import ReactDOM from "react-dom";
import { useForm } from "react-hook-form";
import { yupResolver } from "@hookform/resolvers/yup";
import * as yup from "yup";

import "./styles.css";

const SignupSchema = yup.object().shape({
  select: yup.string().required()
});

function App() {
  const {
    register,
    setValue,
    handleSubmit,
    formState: { errors }
  } = useForm({
    mode: "onChange",
    resolver: yupResolver(SignupSchema)
  });
  const onSubmit = (data) => {
    alert(JSON.stringify(data));
  };

  const doSomething = async (value) => {
    // do something with my select value onChange
  };

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <div>
        <label>Select</label>
        <select
          {...register("select")}
          onChange={(e) => setValue('select', e.target.value, { shouldValidate: true })} // Using setValue
        >
          <option value="">Null</option>
          <option value="1">1</option>
          <option value="2">2</option>
        </select>
        {errors.select && <p>{errors.select.message}</p>}
      </div>
      <input type="submit" />
    </form>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

手动验证

import React from "react";
import ReactDOM from "react-dom";
import { useForm } from "react-hook-form";
import { yupResolver } from "@hookform/resolvers/yup";
import * as yup from "yup";

import "./styles.css";

const SignupSchema = yup.object().shape({
  select: yup.string().required()
});

function App() {
  const {
    register,
    trigger,
    handleSubmit,
    formState: { errors }
  } = useForm({
    mode: "onChange",
    resolver: yupResolver(SignupSchema)
  });
  const onSubmit = (data) => {
    alert(JSON.stringify(data));
  };

  const doSomething = async (value) => {
    // do something with my select value onChange
    await trigger(['select']) // Trigger validation on select
  };

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <div>
        <label>Select</label>
        <select
          {...register("select")}
          onChange={(e) => doSomething(e.target.value)}
        >
          <option value="">Null</option>
          <option value="1">1</option>
          <option value="2">2</option>
        </select>
        {errors.select && <p>{errors.select.message}</p>}
      </div>
      <input type="submit" />
    </form>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);