javascript - 使用 React Native 上下文更新搜索栏中的列表
问题描述
我的 React Native 应用程序中有一个搜索栏，没有上下文实现，列表正确显示。但是当我实现 Context 时，列表不再显示，只显示搜索栏，当我在搜索栏上键入时，我收到此错误消息； ERROR TypeError: item.indexOf is not a function. (In 'item.indexOf(str)', 'item.indexOf' is undefined)
我知道我错过了一些东西，但我不知道我在哪里错过了它。我需要帮助来解决这个问题。下面是我的代码：
//....
//....
import songs from '../../SongData';
import styles from './styles';
const data = [songs];
const ListContext = React.createContext({
list: [data],
setList: () => {}
});
export const ListProvider = ({ children }) => {
const [list, setList] = useState(data);
return (
<ListContext.Provider value={{list, setList}}>
{children}
</ListContext.Provider>
);
};
const Item = ({ item }) => {
return (
<View>
<Text>{item.name}</Text>
</View>
);
};
const Playerlist = () => {
const [isDisabled, setisDisabled] = useState(false);
const [loading, setLoading] = useState(false);
const [isPlayed, setIsPlayed] = useState(false);
const [data, setData] = useState(songs);
//....
//.....
const renderHeader = () => {
const [text, setText] = useState("");
const listContext = useContext(ListContext);
const updateQuery = (str) => {
listContext.setList(data.filter((item) => item.indexOf(str) > -1));
setText(str);
};
return (
<View
style={{
backgroundColor: '#fff',
padding: 10,
marginVertical: 10,
borderRadius: 20
}}
>
<TextInput
autoCapitalize="none"
autoCorrect={false}
clearButtonMode="always"
value={text}
onChangeText={updateQuery}
placeholder="Search songs"
style={{ backgroundColor: '#fff', paddingHorizontal: 20 }}
/>
</View>
)
};
const renderItem = ({ item, index }) => (
<ScrollView style={{flex: 1}}>
<View style={styles.item}>
<Avatar
source={{ uri: item.picture }}
style={{ marginRight: 16 }}
size='giant'
/>
<Text style={styles.title} category='s1'> {item.title} </Text>
</View>
<Text
style={{
color: '#444',
fontSize: 11,
marginLeft: 112,
marginVertical: -20,
bottom: 27
}}
category='s1'
>{item.ArtistName}
</Text>
<Text
style={{
color: '#999',
marginLeft: 110,
marginVertical: -20,
top: 10
}}
category='s1'
>Genre: {item.genre}
</Text>
<View style={{flexDirection: 'row', left: '230%', bottom: '7%'}}>
<TouchableOpacity
onPress={()=>playSound(item, index)}
style={{padding: 10, top: 30, left: 30}}
>
<Ionicons name="play" color={isPlayed ? 'red' : '#555555'} size={22} />
</TouchableOpacity>
<TouchableOpacity
onPress={()=>stopSound(index)}
style={{padding: 10, top: 30, left: 20}}
>
<Ionicons name="stop" color="#555555" size={22} />
</TouchableOpacity>
</View>
</ScrollView>
);
const renderFooter = () => {
if (!loading) return null
return (
<View
style={{
paddingVertical: 15,
borderTopWidth: 1,
borderColor: '#CED0CE',
}}
>
<ActivityIndicator animating size='large' />
</View>
);
}
const renderSeparator = () => {
return (
<View
style={{
height: 1,
width: '86%',
backgroundColor: '#CED0CE',
marginLeft: '5%',
}}
/>
)
}
return (
<ListContext.Consumer>
{(context) => (
<SafeAreaView style={styles.container}>
<FlatList
data={context.list}
renderItem={renderItem}
keyExtractor={(i, key) => 'item-' + key}
ItemSeparatorComponent={renderSeparator}
ListHeaderComponent={renderHeader}
ListFooterComponent={renderFooter}
/>
</SafeAreaView>
)}
</ListContext.Consumer>
);
};这是 SongData.js 代码：
const songs = [
{
id: 1,
title: 'Hero',
ArtistName: 'Bethany Dilon',
genre: 'pop',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.18169-9/16195530_10211997136709517_8578854309931959016_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=09cbfe&_nc_eui2=AeEvt5zlNj1bM87SMIgRXz8VjFbfh8f8mfyMVt-Hx_yZ_ISR6pzt6j1tOqssNCwDfnM&_nc_ohc=oQeQeYLPRz8AX_n81Yh&_nc_ht=scontent-los2-1.xx&oh=d87b3097c543a39067095bacfbeb004d&oe=609BF1DC',
url: require('../../assets/songs/Hero.mp3'),
},
{
id: 2,
title: 'Advertising URL',
ArtistName: 'Bethany Dilon',
genre: 'Soft Rock',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url:
'https://raw.githubusercontent.com/zmxv/react-native-sound-demo/master/advertising.mp3',
},
{
id: 3,
title: 'Stronger',
ArtistName: 'Bethany Dilon',
genre: 'Country',
isRequire: true,
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: require('../../assets/songs/Stronger.mp3'),
},
{
id: 4,
title: 'Faded',
ArtistName: 'Luchee',
genre: 'Techno',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/Faded.mp3',
},
{
id: 5,
title: 'Solo',
ArtistName: 'Solo Cosmos',
genre: 'Afrobeat',
isRequire: true,
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/Solo.mp3',
},
{
id: 6,
title: 'Death Bed',
ArtistName: 'Omowunmi feat Wizkid',
genre: 'Afrocentric',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/death%20bed.mp3',
},
{
id: 7,
title: 'Hero',
ArtistName: 'Bethany Dilon',
genre: 'pop',
isRequire: true,
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.18169-9/16195530_10211997136709517_8578854309931959016_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=09cbfe&_nc_eui2=AeEvt5zlNj1bM87SMIgRXz8VjFbfh8f8mfyMVt-Hx_yZ_ISR6pzt6j1tOqssNCwDfnM&_nc_ohc=oQeQeYLPRz8AX_n81Yh&_nc_ht=scontent-los2-1.xx&oh=d87b3097c543a39067095bacfbeb004d&oe=609BF1DC',
url: require('../../assets/songs/Hero.mp3'),
},
{
id: 8,
title: 'Advertising URL',
ArtistName: 'Bethany Dilon',
genre: 'Soft Rock',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url:
'https://raw.githubusercontent.com/zmxv/react-native-sound-demo/master/advertising.mp3',
},
{
id: 9,
title: 'Stronger',
ArtistName: 'Bethany Dilon',
genre: 'Country',
isRequire: true,
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: require('../../assets/songs/Stronger.mp3'),
},
{
id: 10,
title: 'Faded',
ArtistName: 'Luchee',
genre: 'Techno',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/Faded.mp3',
},
{
id: 11,
title: 'Solo',
ArtistName: 'Solo Cosmos',
genre: 'Afrobeat',
isRequire: true,
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/Solo.mp3',
},
{
id: 12,
title: 'Death Bed',
ArtistName: 'Omowunmi feat Wizkid',
genre: 'Afrocentric',
picture: 'https://scontent-los2-1.xx.fbcdn.net/v/t1.6435-0/s640x640/169534769_1185223728571457_6192837830233317030_n.jpg?_nc_cat=101&ccb=1-3&_nc_sid=9267fe&_nc_eui2=AeH2splO8pf4k-atqrUeWWApKjkWnAsELXsqORacCwQte9doNY5rNtBrWht-o_CYYR4&_nc_ohc=plbZA_Pv91EAX_quQhG&_nc_ht=scontent-los2-1.xx&tp=7&oh=abec7b3bd8ddc13b6c3c0c510a33d8dc&oe=60997696',
url: 'https://github.com/ShivamJoker/sample-songs/raw/master/death%20bed.mp3',
},
];
export default songs;解决方案
推荐阅读
- tensorflow - 模型部署后调用端点：[Err 104] Connection reset by peer
- python - 使用 Sqoop 并行导入 Oracle 表的最佳方法是什么？
- batch-file - 如何从批处理文件中的文件夹名称中提取和使用信息（值、字符串）...
- css - Angular: ng-bootstrap - 带有动画的垂直轮播
- r - 如何将 data.frame（已加载到 R）转换为将创建它的 R 脚本命令，包括数据？
- python - 使用 beautifulsoup 将多个 findall 语句格式化为数据框
- python-3.x - 如何在 python 中为时间序列数据中的组计算 SMAPE？
- python - 重载相等运算符
- python - 从 pyenv-virtualenv 切换到 pipenv 时保持相同的共享虚拟环境
- r - 基于多列匹配合并多个数据框