1
我在一个视图中监听三个输入的onChangeText
。但不是使用三个单独的处理器onChangeText
。我想将输入的输入状态名称传递给处理程序,并从中设置状态。如何在一个处理程序中处理多个更改事件?
我试过这个例子,但e.target.value返回undefined
。在name
作为第二个参数和e
传递的指针元素:
import React, { Component } from 'react';
import { View, StyleSheet, Alert, Image, TextInput } from 'react-native';
import { Constants } from 'expo';
export default class App extends Component {
state = {
setValue: 0,
travelValue: 0,
runValue: 0
};
_handleTextChange (e, name) {
var change = {};
change[name] = e.target.value;
this.setState(change);
}
render() {
return (
<View style={styles.container}>
<TextInput
value={this.state.setValue}
keyboardType = 'numeric'
onChangeText={this._handleTextChange.bind(this, 'setValue')}
style={{ width: 200, height: 44, padding: 8 }}
/>
<TextInput
value={this.state.travelValue}
keyboardType = 'numeric'
onChangeText={this._handleTextChange.bind(this, 'travelValue')}
style={{ width: 200, height: 44, padding: 8 }}
/>
<TextInput
value={this.state.runValue}
keyboardType = 'numeric'
onChangeText={this._handleTextChange.bind(this, 'runValue')}
style={{ width: 200, height: 44, padding: 8 }}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'space-between',
paddingTop: Constants.statusBarHeight,
paddingBottom: '20%',
backgroundColor: '#ecf0f1',
},
});
问题:在一个处理器
你怎么能处理多个更改事件?