How can I remove an item from a FlatList and then update that list in React Native?
I am making a To Do list app using React Native, where I add events to a FlatList and then have a button that removes that event once it it finished. So far this is what I have. It seems very hacky to me, but most of it works.
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
When I press the "remove" button, I delete an element from the list of data that the FlatList uses. However, whenever I do this I get an error saying "Tried to get frame for out of range index NaN". Is there a way for me to regularly update and remove a FlatList, and to re-render the FlatList once I have removed an item? I have tried using the extraDate prop, but it hasn't worked. I believe I am using it wrong though. Thank you for all the help.
javascript react-native
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
add a comment |
I am making a To Do list app using React Native, where I add events to a FlatList and then have a button that removes that event once it it finished. So far this is what I have. It seems very hacky to me, but most of it works.
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
When I press the "remove" button, I delete an element from the list of data that the FlatList uses. However, whenever I do this I get an error saying "Tried to get frame for out of range index NaN". Is there a way for me to regularly update and remove a FlatList, and to re-render the FlatList once I have removed an item? I have tried using the extraDate prop, but it hasn't worked. I believe I am using it wrong though. Thank you for all the help.
javascript react-native
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
add a comment |
I am making a To Do list app using React Native, where I add events to a FlatList and then have a button that removes that event once it it finished. So far this is what I have. It seems very hacky to me, but most of it works.
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
When I press the "remove" button, I delete an element from the list of data that the FlatList uses. However, whenever I do this I get an error saying "Tried to get frame for out of range index NaN". Is there a way for me to regularly update and remove a FlatList, and to re-render the FlatList once I have removed an item? I have tried using the extraDate prop, but it hasn't worked. I believe I am using it wrong though. Thank you for all the help.
javascript react-native
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
I am making a To Do list app using React Native, where I add events to a FlatList and then have a button that removes that event once it it finished. So far this is what I have. It seems very hacky to me, but most of it works.
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
When I press the "remove" button, I delete an element from the list of data that the FlatList uses. However, whenever I do this I get an error saying "Tried to get frame for out of range index NaN". Is there a way for me to regularly update and remove a FlatList, and to re-render the FlatList once I have removed an item? I have tried using the extraDate prop, but it hasn't worked. I believe I am using it wrong though. Thank you for all the help.
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
import React from 'react';
import StyleSheet, Text, View, TextInput,TouchableOpacity, FlatList from 'react-native';
export default class App extends React.Component
constructor(props)
const data = ;
super(props);
this.state =
text: 'Enter activity here',
data: data,
color: true,
currNum: 0,
updateText()
this.setState(data:this.state.data.concat(key:this.state.text,index:this.state.currNum));
this.state.currNum++;
removeText(item)
this.setState(data:this.state.data.pop(item.index));
this.state.currNum--;
render()
return (
<View style=styles.container>
<Text></Text>
<View style = flexDirection:'row',justifyContent:'flex-end'>
<TextInput style = fontSize:30,borderColor:'black', flex:1, marginTop:20 onChangeText = (text) => this.setState(text)value = this.state.text/>
<TouchableOpacity style = marginTop:20onPress = ()=>(this.updateText())>
<Text>Add to list</Text>
</TouchableOpacity>
</View>
<View style = flex:1, flexDirection:'row'>
<FlatList
data = this.state.data
extraData = this.state
renderItem = (item) => <View><Text style=styles.text >item.key</Text><TouchableOpacity onPress = () => this.removeText(item)><Text>Remove</Text></TouchableOpacity></View>
/>
</View>
</View>
);
javascript react-native
javascript react-native
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
asked Nov 15 '18 at 5:23
Dominic MartireDominic Martire
112
112
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
use this instead you shouldn't mutate this.state and Array.prototype.pop() mutates it
removeText(item, index)
this.setState(data: [
...this.state.data.slice(0, index),
...this.state.data.slice(index + 1)
]);
this.state.currNum--;
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
use this instead you shouldn't mutate this.state and Array.prototype.pop() mutates it
removeText(item, index)
this.setState(data: [
...this.state.data.slice(0, index),
...this.state.data.slice(index + 1)
]);
this.state.currNum--;
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
add a comment |
use this instead you shouldn't mutate this.state and Array.prototype.pop() mutates it
removeText(item, index)
this.setState(data: [
...this.state.data.slice(0, index),
...this.state.data.slice(index + 1)
]);
this.state.currNum--;
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
add a comment |
use this instead you shouldn't mutate this.state and Array.prototype.pop() mutates it
removeText(item, index)
this.setState(data: [
...this.state.data.slice(0, index),
...this.state.data.slice(index + 1)
]);
this.state.currNum--;
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
use this instead you shouldn't mutate this.state and Array.prototype.pop() mutates it
removeText(item, index)
this.setState(data: [
...this.state.data.slice(0, index),
...this.state.data.slice(index + 1)
]);
this.state.currNum--;
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
answered Nov 15 '18 at 6:57
Delgee BDelgee B
665
665
add a comment |
add a comment |
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