Contact.render
F:/React/confusion/src/components/ContactComponent.js:133
<Input type="text" id="firstname" name="firstname"
placeholder="First Name"
value={this.state.firstname}
valid={errors.firstname === ''}
invalid={errors.firstname !== ''}
onBlur={this.handleBlur('firstname')}
onChange={this.handleInputChange} />
github:https://github.com/KhushalAbrol/KhushalAbrol--Ristorante-Con-Fusion-React-
请告诉我为什么会出现此错误?
答案 0 :(得分:0)
您正在第133行访问未定义对象的某个值firstname
,即errors
必须 。沿着小路走...
valid={errors.firstname === ''}
您不会从validate
函数返回errors
,因此在line 82上未定义它。
const errors = this.validate(
this.state.firstname,
this.state.lastname,
this.state.telnum,
this.state.email
);
在验证功能的末尾返回errors
。
validate(firstname, lastname, telnum, email) {
const errors = {
firstname: '',
lastname: '',
telnum: '',
email: '',
};
if (this.state.touched.firstname && firstname.length <=3)
errors.firstname = 'First Name should be >=3 characters'
else if (this.state.touched.firstname && firstname.length >=10)
errors.firstname = 'First Name should be <=10 characters'
if (this.state.touched.lastname && lastname.length <=3)
errors.lastname = 'Last Name should be >=3 characters'
else if (this.state.touched.lastname && lastname.length >=10)
errors.lastname = 'Last Name should be <=10 characters'
const reg = /^\d+$/;
if (this.state.touched.telnum && !reg.test(telnum))
errors.telnum = 'Last Name should contain only '
if (this.state.touched.email && email.split('').filter(x => x === '@').length !==1)
errors.email = 'mail should contain a \'@\' '
return errors; // <-- return errors object for consumption
}
遇到错误时,请阅读所有消息,它们通常包括行号和堆栈跟踪,并告诉您问题出在哪里。这就是他们的目的。请同时附上您的相关代码 IN 您的问题,因为git repos可能会发生变异或时间变化,甚至会完全迁移,但此代码应包含在此处,以供将来的读者使用。 / p>