3
对于情况下,我对这个React Native Tutorial阵营机更改国家突发记录
此日志混淆我的方式工作。以下是通过键入“a”然后“b”更改空输入字段时的控制台输出。
这是我的SearchPage类。为什么console.log('searchString = ' + this.state.searchString);
显示以前的值this.state.searchString
?
class SearchPage extends Component {
constructor(props) {
super(props);
this.state = {
searchString: 'london'
};
}
onSearchTextChanged(event) {
console.log('onSearchTextChanged');
console.log('searchString = ' + this.state.searchString +
'; input text = ' + event.nativeEvent.text);
this.setState({ searchString: event.nativeEvent.text });
console.log('Changed State');
console.log('searchString = ' + this.state.searchString);
}
render() {
console.log('SearchPage.render');
return (
<View style={styles.container}>
<Text style = { styles.description }>
Search for houses to Buy!
</Text>
<Text style = {styles.description}>
Search by place name or search near your location.
</Text>
<View style={styles.flowRight}>
<TextInput
style = {styles.searchInput}
value={this.state.searchString}
onChange={this.onSearchTextChanged.bind(this)}
placeholder='Search via name or postcode'/>
<TouchableHighlight style ={styles.button}
underlayColor = '#99d9f4'>
<Text style ={styles.buttonText}>Go</Text>
</TouchableHighlight>
</View>
<TouchableHighlight style={styles.button}
underlayColor= '#99d9f4'>
<Text style={styles.buttonText}>Location</Text>
</TouchableHighlight>
<Image source={require('image!house')} style={styles.image}/>
</View>
);
}
}
谢谢科林。这绝对有帮助。我主要来自Objective-C背景下的React Native开发。所以JavaScript和React的世界是相当新的。你会推荐任何网站学习JavaScript /反应超越文档? –
我的主要建议是学习JavaScript的基础知识,然后在其上放置React。为此目的:http://stackoverflow.com/questions/11246/best-resources-to-learn-javascript –