Javascript React Native onPress功能不工作
我正在做一个图书信息展示的项目。我已经成功地从服务器获取了数据,并希望通过onPress功能使模式弹出并消失。但它不起作用。情态秀,但不会让人失望 我试着把这个.togglePopoff.bind(这个)放在构造函数中,但它不起作用。 我还使用函数“togglePopoff”中的console.log(“我正在按按钮”)检查日志,但日志也没有显示 这是我的构造函数Javascript React Native onPress功能不工作,javascript,react-native,react-native-android,Javascript,React Native,React Native Android,我正在做一个图书信息展示的项目。我已经成功地从服务器获取了数据,并希望通过onPress功能使模式弹出并消失。但它不起作用。情态秀,但不会让人失望 我试着把这个.togglePopoff.bind(这个)放在构造函数中,但它不起作用。 我还使用函数“togglePopoff”中的console.log(“我正在按按钮”)检查日志,但日志也没有显示 这是我的构造函数 constructor(props) { super(props); this.state = {
constructor(props) {
super(props);
this.state = {
currentDate: new Date(),
markedDate: moment(new Date()).format(),
isPopVisible: false,
apiData: [],
activeSwitch: 1,
}
this.ISBN = null;
this.book_name = null;
this.img_src = null;
this.author = null;
this.publisher = null;
this.public_date = null;
this.more_url = null;
this.read_rate = null;
this.read_date = null;
this.category = null;
this.best = null;
this.togglePopoff = this.togglePopoff.bind(this);
}
这是我的功能消失模态
togglePopoff = () => {
this.setState({ isPopVisible: false });
}
saveBook = () => {
this.setState({ isPopVisible: false });
}
这是我的搜索簿功能
searchBook = () => {
this.setState({ isPopVisible: true });
// popup - onoff
if(this.ISBN == null){
this.setState({ isPopVisible: false});
alert("please input ISBN code");
//return 0;
}
else {
fetch('http://220.149.242.12:10001/search/book/' + (this.ISBN), {
method: 'GET'
}).then((responseData) => {
return responseData.json();
}).then((jsonData) => {
console.log(jsonData);
this.setState({ apiData: jsonData })
console.log(this.state.apiData)
}).done();
this.ISBN = null;
this.book_name = null;
this.img_src = null;
this.author = null;
this.publisher = null;
this.public_date = null;
this.more_url = null;
this.read_rate = null;
this.read_date = null;
this.category = null;
this.best = null;
};
}
这就是onPress的发展方向
render() {
const data = this.state.apiData;
const today = this.state.currentDate;
var dataDisplay = null;
if (data && data.items) {
dataDisplay = data.items.map(function (item) {
//var image = "'" + item.image + "'";
var image = item.image;
console.log(image);
return (
<View key={item.user_name} style={styles.popfirst}>
<View style={styles.popsecond}>
<View style={styles.popthird}>
<View style={{ paddingTop: 30, }}>
<Text style={{ color: '#52C8B2', fontSize: 20, }}>book information</Text>
</View>
<View style={{ paddingTop: 20, }}>
<Image style={{ height: 250, width: 150, resizeMode: 'contain', }}
source={{ uri: image }}>
</Image>
</View>
<View style={{ paddingTop: 10, }}>
<Text style={{ fontSize: 18, }}>{item.title}</Text>
</View>
<View style={{ paddingTop: 10, }}>
<Text style={{ color: '#D7D7D7' }}>{item.author} | {item.publisher} | {item.pubdate}</Text>
</View>
<View style={styles.popbtn}>
<View style={{ width: 10, }}></View>
<View style={styles.popbtnleft}>
<SwitchButton
onValueChange={(val) => this.activeSwitch(val)}
text1='reading'
text2='done'
switchWidth={120}
switchHeight={30}
switchdirection='ltr'
switchBorderRadius={0}
switchSpeedChange={500}
switchBorderColor='#52C8B2'
switchBackgroundColor='#F2F2F2'
btnBorderColor='#52C8B2'
btnBackgroundColor='#52C8B2'
fontcolor='#333'
activeFontColor='#FFF'
/>
</View>
</View>
<View style={styles.popbtnbig}>
<TouchableOpacity style={styles.bigbtn} onPress={this.togglePopoff}><Text style={{ fontSize: 16, color: '#FFF' }}>cancle</Text></TouchableOpacity>
<TouchableOpacity style={styles.bigbtn} onPress={this.saveBook}><Text style={{ fontSize: 16, color: '#FFF' }}>save</Text></TouchableOpacity>
</View>
</View>
</View>
</View>
)
});
};
return (
<View style={cstyle.greycontainer}>
<View style={styles.firstbox}>
<Text style={{ color: '#FFF', fontSize: 20 }}>input ISBN code</Text>
</View>
<View style={styles.secondbox}>
<TextInput style={styles.input}
placeholder="Enter ISBN"
onChangeText={(text) => { this.ISBN = text }}
value={this.ISBN}
/>
<TouchableOpacity style={styles.searchbtn} onPress={this.searchBook}>
<IonIcon name="ios-search" size={30} color='#FFF' />
</TouchableOpacity>
</View>
<View style={styles.firstbox}>
<TouchableOpacity style={styles.greenbtn}>
<Text style={{ color: '#FFF', fontSize: 20 }}>cancle</Text>
</TouchableOpacity>
</View>
<Modal isVisible={this.state.isPopVisible}>
{dataDisplay}
</Modal>
</View>
);
}
}
render(){
const data=this.state.apiData;
const today=this.state.currentDate;
var-dataDisplay=null;
if(数据和数据项){
dataDisplay=data.items.map(函数(项){
//var image=“””+item.image+“”;
var image=item.image;
console.log(图像);
返回(
图书信息
{item.title}
{item.author}{item.publisher}{item.pubdate}
this.activeSwitch(val)}
text1='reading'
text2='done'
开关宽度={120}
开关高度={30}
开关方向='ltr'
switchBorderRadius={0}
switchSpeedChange={500}
switchBorderColor='#52C8B2'
switchBackgroundColor='#f2f2'
btnBorderColor='#52C8B2'
btnBackgroundColor='#52C8B2'
fontcolor='#333'
activeFontColor='#FFF'
/>
癌变
拯救
)
});
};
返回(
输入ISBN码
{this.ISBN=text}
值={this.ISBN}
/>
癌变
{dataDisplay}
);
}
}
我怎样才能把这辆车开走
this.togglepopfoff=this.togglepopfoff.bind(this)代码>
由于您已经在使用arrow函数,所以不需要绑定函数。绑定方法已存在于箭头函数中
这是正确的,只需从构造函数中删除bind方法。编辑
尝试在构造函数中绑定所有函数,如下所示:
constructor(props) {
super(props);
this.state = {
currentDate: new Date(),
markedDate: moment(new Date()).format(),
isPopVisible: false,
apiData: [],
activeSwitch: 1,
}
this.ISBN = null;
this.book_name = null;
this.img_src = null;
this.author = null;
this.publisher = null;
this.public_date = null;
this.more_url = null;
this.read_rate = null;
this.read_date = null;
this.category = null;
this.best = null;
this.togglePopoff = this.togglePopoff.bind(this);
this.saveBook = this.saveBook.bind(this);
}
togglePopoff(){
this.setState({ isPopVisible: false });
}
saveBook(){
this.setState({ isPopVisible: false });
}
<TouchableOpacity style={styles.bigbtn} onPress={() => this.togglePopoff()}><Text style={{ fontSize: 16, color: '#FFF' }}>cancle</Text></TouchableOpacity>
<TouchableOpacity style={styles.bigbtn} onPress={() => this.saveBook()}><Text style={{ fontSize: 16, color: '#FFF' }}>save</Text></TouchableOpacity>
创建如下函数:
constructor(props) {
super(props);
this.state = {
currentDate: new Date(),
markedDate: moment(new Date()).format(),
isPopVisible: false,
apiData: [],
activeSwitch: 1,
}
this.ISBN = null;
this.book_name = null;
this.img_src = null;
this.author = null;
this.publisher = null;
this.public_date = null;
this.more_url = null;
this.read_rate = null;
this.read_date = null;
this.category = null;
this.best = null;
this.togglePopoff = this.togglePopoff.bind(this);
this.saveBook = this.saveBook.bind(this);
}
togglePopoff(){
this.setState({ isPopVisible: false });
}
saveBook(){
this.setState({ isPopVisible: false });
}
<TouchableOpacity style={styles.bigbtn} onPress={() => this.togglePopoff()}><Text style={{ fontSize: 16, color: '#FFF' }}>cancle</Text></TouchableOpacity>
<TouchableOpacity style={styles.bigbtn} onPress={() => this.saveBook()}><Text style={{ fontSize: 16, color: '#FFF' }}>save</Text></TouchableOpacity>
这样称呼他们:
constructor(props) {
super(props);
this.state = {
currentDate: new Date(),
markedDate: moment(new Date()).format(),
isPopVisible: false,
apiData: [],
activeSwitch: 1,
}
this.ISBN = null;
this.book_name = null;
this.img_src = null;
this.author = null;
this.publisher = null;
this.public_date = null;
this.more_url = null;
this.read_rate = null;
this.read_date = null;
this.category = null;
this.best = null;
this.togglePopoff = this.togglePopoff.bind(this);
this.saveBook = this.saveBook.bind(this);
}
togglePopoff(){
this.setState({ isPopVisible: false });
}
saveBook(){
this.setState({ isPopVisible: false });
}
<TouchableOpacity style={styles.bigbtn} onPress={() => this.togglePopoff()}><Text style={{ fontSize: 16, color: '#FFF' }}>cancle</Text></TouchableOpacity>
<TouchableOpacity style={styles.bigbtn} onPress={() => this.saveBook()}><Text style={{ fontSize: 16, color: '#FFF' }}>save</Text></TouchableOpacity>
this.togglePopoff()}>cancle
this.saveBook()}>save
我删除了它,但仍然无法工作。。。可能是因为isVisible in Modal标记?它正在工作,但出现了错误,“this2.togglepoff不是一个函数。(在“\u this2.togglepoff()”,“\u this2.togglepoff”未定义)”所以现在它想做些什么,但给出了一个错误?我明白了吗?嗯…是的,我想onPress开始调用函数了。但是函数出错了。我把console.log(“working function”)放在了togglePopoff函数里面,但是log没有显示,并且给出了一个错误。谢谢你的回复,但是它也不起作用。。。仍然出现同样的错误:(我解决了!!!!!我将“dataDisplay=data.items.map(function(item)”更改为“dataDisplay=data.items.map(item=>{}”),并且运行正常!!非常感谢您的友好回复!!