我定义了两个TextInput字段如下:
<TextInput
style = {styles.titleInput}
returnKeyType = {"next"}
autoFocus = {true}
placeholder = "Title" />
<TextInput
style = {styles.descriptionInput}
multiline = {true}
maxLength = {200}
placeholder = "Description" />
但在按下键盘上的“next”按钮后,我的react-native应用程序并没有跳转到第二个TextInput字段。我怎样才能做到呢?
谢谢!
我创建了一个小库来做这件事,除了替换你的包装视图和导入TextInput,不需要更改代码:
import { Form, TextInput } from 'react-native-autofocus'
export default () => (
<Form>
<TextInput placeholder="test" />
<TextInput placeholder="test 2" />
</Form>
)
https://github.com/zackify/react-native-autofocus
详细解释在这里:https://zach.codes/autofocus-inputs-in-react-native/
在React Native的GitHub问题上尝试这个解决方案。
https://github.com/facebook/react-native/pull/2149#issuecomment-129262565
你需要为TextInput组件使用ref道具。
然后你需要创建一个函数,该函数在onSubmitEditing道具上被调用,将焦点移动到第二个TextInput引用上。
var InputScreen = React.createClass({
_focusNextField(nextField) {
this.refs[nextField].focus()
},
render: function() {
return (
<View style={styles.container}>
<TextInput
ref='1'
style={styles.input}
placeholder='Normal'
returnKeyType='next'
blurOnSubmit={false}
onSubmitEditing={() => this._focusNextField('2')}
/>
<TextInput
ref='2'
style={styles.input}
keyboardType='email-address'
placeholder='Email Address'
returnKeyType='next'
blurOnSubmit={false}
onSubmitEditing={() => this._focusNextField('3')}
/>
<TextInput
ref='3'
style={styles.input}
keyboardType='url'
placeholder='URL'
returnKeyType='next'
blurOnSubmit={false}
onSubmitEditing={() => this._focusNextField('4')}
/>
<TextInput
ref='4'
style={styles.input}
keyboardType='numeric'
placeholder='Numeric'
blurOnSubmit={false}
onSubmitEditing={() => this._focusNextField('5')}
/>
<TextInput
ref='5'
style={styles.input}
keyboardType='numbers-and-punctuation'
placeholder='Numbers & Punctuation'
returnKeyType='done'
/>
</View>
);
}
});
下面是如何为reactjs的电话代码输入实现这一点
import React, { useState, useRef } from 'react';
function Header(props) {
const [state , setState] = useState({
phone_number:"",
code_one:'',
code_two:'',
code_three:'',
code_four:'',
submitted:false,
})
const codeOneInput = useRef(null);
const codeTwoInput = useRef(null);
const codeThreeInput = useRef(null);
const codeFourInput = useRef(null);
const handleCodeChange = (e) => {
const {id , value} = e.target
if(value.length < 2){
setState(prevState => ({
...prevState,
[id] : value
}))
if(id=='code_one' && value.length >0){
codeTwoInput.current.focus();
}
if(id=='code_two' && value.length >0){
codeThreeInput.current.focus();
}
if(id=='code_three' && value.length >0){
codeFourInput.current.focus();
}
}
}
const sendCodeToServer = () => {
setState(prevState => ({
...prevState,
submitted : true,
}))
let codeEnteredByUser = state.code_one + state.code_two + state.code_three + state.code_four
axios.post(API_BASE_URL, {code:codeEnteredByUser})
.then(function (response) {
console.log(response)
})
}
return(
<>
<div className="are">
<div className="POP-INN-INPUT">
<input type="text" id="code_one" ref={codeOneInput} value={state.code_one} onChange={handleCodeChange} autoFocus/>
<input type="text" id="code_two" ref={codeTwoInput} value={state.code_two} onChange={handleCodeChange}/>
<input type="text" id="code_three" ref={codeThreeInput} value={state.code_three} onChange={handleCodeChange}/>
<input type="text" id="code_four" ref={codeFourInput} value={state.code_four} onChange={handleCodeChange}/>
</div>
<button disabled={state.submitted} onClick={sendCodeToServer}>
</div>
</>
)
}
export default
有一种方法可以捕获TextInput中的制表符。这很俗气,但总比没有好。
定义一个onChangeText处理程序,比较新输入值和旧输入值,检查是否有\t。如果找到一个,推进字段如@boredgames所示
假设变量username包含用户名的值,setUsername在存储(组件状态,redux存储等)中分派一个动作来更改它,执行如下操作:
function tabGuard (newValue, oldValue, callback, nextCallback) {
if (newValue.indexOf('\t') >= 0 && oldValue.indexOf('\t') === -1) {
callback(oldValue)
nextCallback()
} else {
callback(newValue)
}
}
class LoginScene {
focusNextField = (nextField) => {
this.refs[nextField].focus()
}
focusOnPassword = () => {
this.focusNextField('password')
}
handleUsernameChange = (newValue) => {
const { username } = this.props // or from wherever
const { setUsername } = this.props.actions // or from wherever
tabGuard(newValue, username, setUsername, this.focusOnPassword)
}
render () {
const { username } = this.props
return (
<TextInput ref='username'
placeholder='Username'
autoCapitalize='none'
autoCorrect={false}
autoFocus
keyboardType='email-address'
onChangeText={handleUsernameChange}
blurOnSubmit={false}
onSubmitEditing={focusOnPassword}
value={username} />
)
}
}