Mixing
React Native Flatlist scrollToEnd after new item added
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
I need to scroll to the end of FlatList after adding of new list item (like a chat).
So I change state with new message and then use:
this.setState({messages});
this.messagesList.scrollToEnd({animated: true});
It wotks only if I add some 'magic' setTimeout (200ms).
It there any way to detect that new message is added and I can call scrollToEnd?
react-native react-native-flatlist
asked Jan 3 at 12:28
user3228157user3228157
1
add a comment |
I need to scroll to the end of FlatList after adding of new list item (like a chat).
So I change state with new message and then use:
this.setState({messages});
this.messagesList.scrollToEnd({animated: true});
It wotks only if I add some 'magic' setTimeout (200ms).
It there any way to detect that new message is added and I can call scrollToEnd?
react-native react-native-flatlist
asked Jan 3 at 12:28
user3228157user3228157
1
add a comment |
I need to scroll to the end of FlatList after adding of new list item (like a chat).
So I change state with new message and then use:
this.setState({messages});
this.messagesList.scrollToEnd({animated: true});
It wotks only if I add some 'magic' setTimeout (200ms).
It there any way to detect that new message is added and I can call scrollToEnd?
react-native react-native-flatlist
asked Jan 3 at 12:28
user3228157user3228157
1
I need to scroll to the end of FlatList after adding of new list item (like a chat).
So I change state with new message and then use:
this.setState({messages});
this.messagesList.scrollToEnd({animated: true});
It wotks only if I add some 'magic' setTimeout (200ms).
It there any way to detect that new message is added and I can call scrollToEnd?
react-native react-native-flatlist
react-native react-native-flatlist
asked Jan 3 at 12:28
user3228157user3228157
1
asked Jan 3 at 12:28
user3228157user3228157
1
asked Jan 3 at 12:28
user3228157user3228157
1
asked Jan 3 at 12:28
user3228157user3228157
1
asked Jan 3 at 12:28
user3228157user3228157
1
1
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
setState is asynchronous so doing something after it like that will not work.
To do something after state it's set - pass callback to setState as second argument.
this.setState(
{messages},
() => this.messagesList.scrollToEnd({animated: true})
);
But from my experience you will need still have short setTimeout. As after setting state there can be some lag created by rendering and scroll will be fired too early.
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
setState is asynchronous so doing something after it like that will not work.
To do something after state it's set - pass callback to setState as second argument.
this.setState(
{messages},
() => this.messagesList.scrollToEnd({animated: true})
);
But from my experience you will need still have short setTimeout. As after setting state there can be some lag created by rendering and scroll will be fired too early.
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
add a comment |
setState is asynchronous so doing something after it like that will not work.
To do something after state it's set - pass callback to setState as second argument.
this.setState(
{messages},
() => this.messagesList.scrollToEnd({animated: true})
);
But from my experience you will need still have short setTimeout. As after setting state there can be some lag created by rendering and scroll will be fired too early.
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
add a comment |
setState is asynchronous so doing something after it like that will not work.
To do something after state it's set - pass callback to setState as second argument.
this.setState(
{messages},
() => this.messagesList.scrollToEnd({animated: true})
);
But from my experience you will need still have short setTimeout. As after setting state there can be some lag created by rendering and scroll will be fired too early.
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
setState is asynchronous so doing something after it like that will not work.
To do something after state it's set - pass callback to setState as second argument.
this.setState(
{messages},
() => this.messagesList.scrollToEnd({animated: true})
);
But from my experience you will need still have short setTimeout. As after setting state there can be some lag created by rendering and scroll will be fired too early.
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
answered Jan 3 at 12:48
Paweł MikołajczukPaweł Mikołajczuk
3,1092030
3,1092030
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
add a comment |
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
1
1
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
Thx for the note about setState. But yes, it's still require some timeout (and not 0 but some number) and I worry this timeout may not work for slow devices. But in a while ScrollView works fine, so looks like it's related with 'smart rendering' behaviour of FlatList component.
– user3228157
Jan 3 at 13:24
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
if my answer 'solved' Your issue then please don't forget about accepting it.
– Paweł Mikołajczuk
Jan 3 at 13:52
add a comment |
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