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!
当前回答
我的场景是< CustomBoladonesTextInput />包装一个RN < TextInput />。
我是这样解决这个问题的:
我的表单是这样的:
<CustomBoladonesTextInput
onSubmitEditing={() => this.customInput2.refs.innerTextInput2.focus()}
returnKeyType="next"
... />
<CustomBoladonesTextInput
ref={ref => this.customInput2 = ref}
refInner="innerTextInput2"
... />
在CustomBoladonesTextInput的组件定义中，我像这样将refField传递给内部的ref道具:
export default class CustomBoladonesTextInput extends React.Component {
render() {
return (< TextInput ref={this.props.refInner} ... />);
}
}
瞧。一切恢复正常。 希望这能有所帮助
其他回答
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} />
)
}
}
我就是这样做到的。下面的例子使用了React 16.3中引入的React. createref () API。
class Test extends React.Component {
constructor(props) {
super(props);
this.secondTextInputRef = React.createRef();
}
render() {
return(
<View>
<TextInput
placeholder = "FirstTextInput"
returnKeyType="next"
onSubmitEditing={() => { this.secondTextInputRef.current.focus(); }}
/>
<TextInput
ref={this.secondTextInputRef}
placeholder = "secondTextInput"
/>
</View>
);
}
}
我想这对你有帮助。
import React, { useState, useEffect, useRef, } from 'react';
const OTP = (props) => {
const OTP = [];
const ref_input = [];
ref_input[0] = useRef();
ref_input[1] = useRef();
ref_input[2] = useRef();
ref_input[3] = useRef();
const focusNext = (text, index) => {
if (index < ref_input.length - 1 && text) {
ref_input[index + 1].current.focus();
}
if (index == ref_input.length - 1) {
ref_input[index].current.blur();
}
OTP[index] = text;
}
const focusPrev = (key, index) => {
if (key === "Backspace" && index !== 0) {
ref_input[index - 1].current.focus();
}
}
return (
<SafeAreaView>
<View>
<ScrollView contentInsetAdjustmentBehavior="automatic" showsVerticalScrollIndicator={false}>
<View style={loginScreenStyle.titleWrap}>
<Title style={loginScreenStyle.titleHeading}>Verify OTP</Title>
<Subheading style={loginScreenStyle.subTitle}>Enter the 4 digit code sent to your mobile number</Subheading>
</View>
<View style={loginScreenStyle.inputContainer}>
<TextInput
mode="flat"
selectionColor={Colors.primaryColor}
underlineColorAndroid="transparent"
textAlign='center'
maxLength={1}
keyboardType='numeric'
style={formScreenStyle.otpInputStyle}
autoFocus={true}
returnKeyType="next"
ref={ref_input[0]}
onChangeText={text => focusNext(text, 0)}
onKeyPress={e => focusPrev(e.nativeEvent.key, 0)}
/>
<TextInput
mode="flat"
selectionColor={Colors.primaryColor}
underlineColorAndroid="transparent"
textAlign='center'
maxLength={1}
keyboardType='numeric'
style={formScreenStyle.otpInputStyle}
ref={ref_input[1]}
onChangeText={text => focusNext(text, 1)}
onKeyPress={e => focusPrev(e.nativeEvent.key, 1)}
/>
<TextInput
mode="flat"
selectionColor={Colors.primaryColor}
underlineColorAndroid="transparent"
textAlign='center'
maxLength={1}
keyboardType='numeric'
style={formScreenStyle.otpInputStyle}
ref={ref_input[2]}
onChangeText={text => focusNext(text, 2)}
onKeyPress={e => focusPrev(e.nativeEvent.key, 2)}
/>
<TextInput
mode="flat"
selectionColor={Colors.primaryColor}
underlineColorAndroid="transparent"
textAlign='center'
maxLength={1}
keyboardType='numeric'
style={formScreenStyle.otpInputStyle}
ref={ref_input[3]}
onChangeText={text => focusNext(text, 3)}
onKeyPress={e => focusPrev(e.nativeEvent.key, 3)}
/>
</View>
</ScrollView>
</View>
</SafeAreaView >
)
}
export default OTP;
我想分享我的解决方案使用功能组件…“这个”不需要!
React 16.12.0和React Native 0.61.5
这是我的组件的一个例子:
import React, { useRef } from 'react'
...
const MyFormComponent = () => {
const ref_input2 = useRef();
const ref_input3 = useRef();
return (
<>
<TextInput
placeholder="Input1"
autoFocus={true}
returnKeyType="next"
onSubmitEditing={() => ref_input2.current.focus()}
/>
<TextInput
placeholder="Input2"
returnKeyType="next"
onSubmitEditing={() => ref_input3.current.focus()}
ref={ref_input2}
/>
<TextInput
placeholder="Input3"
ref={ref_input3}
/>
</>
)
}
此处为具有:focus属性的输入组件的试剂溶液。
只要这个道具设置为true，字段就会被聚焦;如果这个道具设置为false，字段就不会有焦点。
不幸的是，这个组件需要定义一个:ref，我找不到其他方法来调用.focus()。我很高兴听到建议。
(defn focusable-input [init-attrs]
(r/create-class
{:display-name "focusable-input"
:component-will-receive-props
(fn [this new-argv]
(let [ref-c (aget this "refs" (:ref init-attrs))
focus (:focus (ru/extract-props new-argv))
is-focused (.isFocused ref-c)]
(if focus
(when-not is-focused (.focus ref-c))
(when is-focused (.blur ref-c)))))
:reagent-render
(fn [attrs]
(let [init-focus (:focus init-attrs)
auto-focus (or (:auto-focus attrs) init-focus)
attrs (assoc attrs :auto-focus auto-focus)]
[input attrs]))}))
https://gist.github.com/Knotschi/6f97efe89681ac149113ddec4c396cc5
