Javascript 如何获取input-reac本机的值?
我试图在用户单击submit后获取输入值,我有一个简单的表单要求用户签名 当用户在handleLogin中单击submit时,我调用handleSignature并将签名传递给输入,但下面是我丢失了如何获取此字段的值,即包含signature.led的字段Javascript 如何获取input-reac本机的值?,javascript,reactjs,forms,react-native,Javascript,Reactjs,Forms,React Native,我试图在用户单击submit后获取输入值,我有一个简单的表单要求用户签名 当用户在handleLogin中单击submit时,我调用handleSignature并将签名传递给输入,但下面是我丢失了如何获取此字段的值,即包含signature.led的字段 export default function Form({navigation}) { const handleLogin = (data, setSubmitting) => { handle
export default function Form({navigation}) {
const handleLogin = (data, setSubmitting) => {
handleSignature();
}
return (
<>
<Formik
initialValues = {{first_name: '', last_name:' }}
onSubmit = { (values, {setSubmitting }) => {
handleLogin(values, setSubmitting);
}}>
{({handleChange, handleBlur, handleSubmit, values, isSubmitting, errors, touched}) => (
<>
<View style={styles.CONTENT}>
<View style={styles.INPUTS}>
<MyTextInput
label = "First Name"
onChangeText = {handleChange('first_name')}
onBlur = {handleBlur('first_name')}
values = {values.first_name || ''}
returnKeyType = "next"
innerRef = {input1}
/>
<MyTextInput
label = "Last Name"
onChangeText = {handleChange('last_name')}
onBlur = {handleBlur('last_name')}
values = {values.last_name}
returnKeyType = "next"
refInner = {input2}
/>
<MyTextInput
values = {signature}
/>
</View>
</>
</Formik>
)
导出默认函数表单({navigation}){
常量handleLogin=(数据,设置提交)=>{
手签名();
}
报税表(
如果要获取输入值,需要将值绑定到状态,如下所示
constructor(props) {
super(props);
this.state = {
first_name: '', // state
last_name: ''
};
}
<MyTextInput
label="First Name"
onBlur={handleBlur('first_name')}
values={values.first_name || ''}
returnKeyType="next"
innerRef={input1}
onChangeText={e => this.setState({first_name: e})} // binding value
/>
const handleLogin = (data, setSubmitting) => {
handleSignature();
console.log(this.state.first_name) // the value of input
}
如果您使用类组件,上述方法将有效,但在您的情况下,您使用的是功能组件,因此您可以使用下面的snippt解决问题
import React, {useState, useEffect} from 'react';
export default function Form({navigation}) {
const [firstName, setFirstName] = useState('');
const [lastName, setlastName] = useState('');
const handleLogin = (data, setSubmitting) => {
handleSignature();
console.log(firstName); // output the firstname
console.log(lastName); // output the lastname
};
return (
<>
<MyTextInput
label="First Name"
onBlur={handleBlur('first_name')}
values={values.first_name || ''}
returnKeyType="next"
innerRef={input1}
onChangeText={e => setFirstName(e)} // binding value
/>
</>
);
}
import React,{useState,useffect}来自“React”;
导出默认函数窗体({navigation}){
const[firstName,setFirstName]=useState(“”);
const[lastName,setlastName]=useState(“”);
常量handleLogin=(数据,设置提交)=>{
手签名();
console.log(firstName);//输出firstName
console.log(lastName);//输出lastName
};
返回(
setFirstName(e)}//绑定值
/>
);
}
Sortry关于这个问题,Mohamend,但是我需要在哪里声明“this.state”我放的每一个地方都会收到一个错误“Unexpexted token,expected”,。我已经更新了我问题的代码。谢谢你回答更新@PedroThank you:)终于开始工作了欢迎你@Pedro