我试图使用这个Binding context when calling ES6 method. How to access object from within method called as callback?作为从书中的ES 5到ES6重构的指南;然而,我似乎无法跟踪我意想不到的令牌问题。这些文件都在构造函数完成后给了我一个问题。任何帮助都是感激的。
WeatherProject.js
class WeatherProject extends Component {
constructor(props) {
super(props);
this.state = { zip: '',
forecast: null};
},
_handleTextChange(event){
let zip = event.nativeEvent.text;
this.setState({zip: zip});
fetch('http://api.openweathermap.org/data/2.5/weather?q='
+ zip + '&units=imperial')
.then((response) => response.json())
.then((responseJSON) => {
console.log(responseJSON);
this.setState({
forecast: {
main: responseJSON.weather[0].main,
description: responseJSON.weather[0].description,
temp: responseJSON.main.temp
}
})
})
.catch((error) => {
console.warn(error);
})
},
render() {
let content = null;
if (this.state.forecast !== null) {
content = <Forecast
main={this.state.forecast.main}
description={this.state.forecast.description}
temp={this.state.forecast.temp}/>;
}
return (
<View style={styles.container}>
<Image source={require('image!flowers')}
resizeMode= 'cover'
style={styles.backdrop}>
<View style={styles.overlay}>
<View style={styles.row}>
<Text style={styles.mainText}>
Current weather for
</Text>
<View style={styles.zipContainer}>
<TextInput
style={[styles.zipCode,styles.mainText]}
returnKeyType='go'
onSubmitEditing={this._handleTextChange} />
</View>
</View>
{content}
</View>
</Image>
</View>
);
}
}
字符串
Forecast.js
class Forecast extends Component {
constructor(props) {
super(props);
this.state = {
zip: '',
forecast: {
main: 'Clouds',
description: 'few clouds',
temp: 45.7
}
};
},
render() {
return (
<View>
<Text style={styles.bigText}>
{this.props.main}
</Text>
<Text style={styles.mainText}>
Current conditions: {this.props.description}
</Text>
<Text style={styles.mainText}>
{this.props.temp} F
</Text>
</View>
);
}
}
型
2条答案
按热度按时间v64noz0r1#
删除每个函数末尾的逗号。在ES6语法中,函数后面不再需要逗号
flvtvl502#
无效的节点版本也可能是导致此问题的原因之一
https://github.com/facebook/react-native/issues/34768#issuecomment-1261364555