我迈出了第一步,开始学习Rect Native,并且一段时间以来一直被这些错误所困扰。当我单击项目时:
我得到这些错误:
这是我的React Native代码:
import React, { Component } from 'react';
import {
AppRegistry,
Text,
View,
ListView,
StyleSheet,
TouchableHighlight
} from 'react-native';
export default class Component5 extends Component {
constructor(){
super();
const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
this.state = {
userDataSource: ds
};
this._onPress = this._onPress.bind(this);
}
_onPress(user){
console.log(user);
}
renderRow(user, sectionId, rowId, hightlightRow){
return(
<TouchableHighlight onPress={() => {this._onPress(user)}}>
<View style={styles.row}>
<Text style={styles.rowText}>{user.name}: {user.email}</Text>
</View>
</TouchableHighlight>
)
}
fetchUsers(){
fetch('https://jsonplaceholder.typicode.com/users')
.then((response) => response.json())
.then((response) => {
this.setState({
userDataSource: this.state.userDataSource.cloneWithRows(response)
});
});
}
componentDidMount(){
this.fetchUsers();
}
render() {
return (
<ListView
style={styles.listView}
dataSource={this.state.userDataSource}
renderRow={this.renderRow.bind()}
/>
);
}
}
const styles = StyleSheet.create({
listView: {
marginTop: 40
},
row: {
flexDirection: 'row',
justifyContent: 'center',
padding: 10,
backgroundColor: 'blue',
marginBottom: 3
},
rowText: {
flex: 1,
color: 'white'
}
})
AppRegistry.registerComponent('Component5', () => Component5);
非常感谢任何输入!
最佳答案
新秀错误-忘记在组件中正确绑定(bind)renderRow。我写:renderRow={this.renderRow.bind()}
当然应该是:renderRow={this.renderRow.bind(this)}