Javascript 使用React Hook表单未显示验证错误
我使用来验证一些简单的输入:Javascript 使用React Hook表单未显示验证错误,javascript,reactjs,react-hook-form,Javascript,Reactjs,React Hook Form,我使用来验证一些简单的输入: import React from "react"; import useForm from "react-hook-form"; import "./App.css"; function App() { const { register, handleSubmit, errors } = useForm(); const onSubmit = data => { console.
import React from "react";
import useForm from "react-hook-form";
import "./App.css";
function App() {
const { register, handleSubmit, errors } = useForm();
const onSubmit = data => {
console.log(data);
};
return (
<div className="App">
<header className="App-header">
<form onSubmit={handleSubmit(onSubmit)}>
<input
className="mkn-input"
name="firstName"
placeholder="First name"
ref={register({
required: true,
maxlength: 20,
message: "invalid first name"
})}
/>
<span> {errors.firstName && errors.firstName.message}</span>
<input
placeholder="Last name"
className="mkn-input"
name="lastName"
ref={register({
pattern: /^[A-Za-z]+$/i,
message: "Invalid last name"
})}
/>
{errors.lastName && <span> errors.lastName.message</span>}
<input
name="age"
type="number"
placeholder="Age"
className="mkn-input"
ref={register({ min: 18, max: 99 })}
/>
<input type="submit" className="mkn-btn" />
</form>
</header>
</div>
);
}
export default App;
从“React”导入React;
从“react hook form”导入useForm;
导入“/App.css”;
函数App(){
常量{register,handleSubmit,errors}=useForm();
const onSubmit=data=>{
控制台日志(数据);
};
返回(
{errors.firstName&&errors.firstName.message}
{errors.lastName&&errors.lastName.message}
);
}
导出默认应用程序;
但是我面临一个奇怪的问题,在DOM中显示错误,我也尝试将它们登录到控制台中,但没有成功,我遗漏了什么
完整代码:
您需要在
所需
字段中添加消息
,或者只需查询是否有错误:
<>
<input
name="firstName"
placeholder="First name"
ref={register({
required: 'invalid first name'
})}
/>
<span> {errors.firstName && errors.firstName.message}</span>
</>
// Or
<>
<input
placeholder="Last name"
className="mkn-input"
name="lastName"
ref={register({
required: true,
pattern: /^[A-Za-z]+$/i
})}
/>
{errors.lastName && <span>Invalid last name</span>}
</>
// Or https://react-hook-form.com/advanced-usage#ErrorMessage
{errors.firstName&&errors.firstName.message}
//或
{errors.lastName&&Invalid lastName}
//或https://react-hook-form.com/advanced-usage#ErrorMessage
函数应用程序(){
常量{register,handleSubmit,errors}=useForm();
const onSubmit=data=>{
控制台日志(数据);
};
返回(
{errors.firstName&&errors.firstName.message}
{errors.lastName&&Invalid lastName}
);
}
您需要在
所需
字段中添加消息
,或者只需查询是否有错误:
<>
<input
name="firstName"
placeholder="First name"
ref={register({
required: 'invalid first name'
})}
/>
<span> {errors.firstName && errors.firstName.message}</span>
</>
// Or
<>
<input
placeholder="Last name"
className="mkn-input"
name="lastName"
ref={register({
required: true,
pattern: /^[A-Za-z]+$/i
})}
/>
{errors.lastName && <span>Invalid last name</span>}
</>
// Or https://react-hook-form.com/advanced-usage#ErrorMessage
{errors.firstName&&errors.firstName.message}
//或
{errors.lastName&&Invalid lastName}
//或https://react-hook-form.com/advanced-usage#ErrorMessage
函数应用程序(){
常量{register,handleSubmit,errors}=useForm();
const onSubmit=data=>{
控制台日志(数据);
};
返回(
{errors.firstName&&errors.firstName.message}
{errors.lastName&&Invalid lastName}
);
}