当我单击“提交”按钮并触发onSubmit事件时,我正在使用Formik和Yup进行响应,并且在事件内部,提取函数调用了两次,
import React, { Component } from 'react';
import Button from '@material-ui/core/Button';
import Container from '@material-ui/core/Container';
import { TextField } from 'formik-material-ui';
import { Formik, Field, Form } from 'formik';
import * as Yup from 'yup';
class LoginForm extends Component {
constructor(props) {
super(props);
this.state = {classes: this.props.classes, isLoading: false }
}
render() {
return (
<Formik
initialValues={initialFormValues}
validationSchema={validationFrom}
onSubmit={(values, actions) => {
this.setState({ isLoading: true });
console.log(values);
actions.setSubmitting(false);
console.log('SUCCESS!! :-)\n\n' + JSON.stringify(values, null, 2));
fetch('http://xx.xx.xx.xx.compute-1.amazonaws.com:9000/api/v1/userAuth', {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify(values)
})
.then(Response => {
console.log(Response);
this.setState({ isLoading: false });
})
}
}
render={({ submitForm, isSubmitting, isValid }) => (
<Form>
<Container component="main" maxWidth="xs" >
<div className={this.state.classes.paper}>
<Field
variant="outlined" margin="normal" fullWidth label="User ID" name="userid" id="userid" type="text"
autoComplete="userid" component={TextField} />
<Field
variant="outlined" margin="normal" fullWidth id="password" name="password" label="Password" type="password"
autoComplete="current-password" component={TextField} />
<Button
type="submit" fullWidth variant="contained" color="primary"
className={this.state.classes.submit} disabled={isSubmitting || !isValid}
> Sign In
</Button>
</div>
</Container>
</Form>
)}
/>
)
}
}
export default LoginForm;
我是React的新手,我在Google上搜索它,但是没有运气,这是我尝试过的代码,我调用了用于用户身份验证的API来验证userId和密码,请建议我采取正确的方法来调用API。
答案 0 :(得分:3)
我看到第一个调用是0个字节。
尽管我看不到您的 XHR 通话的详细信息,但是恕我直言,第一个通话不是 POST 动词,而是 OPTION 。
在 OPTION 调用中,服务器根据 CORS 授权或拒绝对端点的访问。因此,我认为这并不奇怪。