Flutter Enable/Disable Button based on TextFormField content
How can I activate/deactivate a button based on the content of a TextFormField?
I want to make sure a user can only press Button X if the TextFormField has 10 entered numbers (if it's a mobile number).
Thanks!
button keyboard
flutter textfield flutter-layout asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
add a comment |
How can I activate/deactivate a button based on the content of a TextFormField?
I want to make sure a user can only press Button X if the TextFormField has 10 entered numbers (if it's a mobile number).
Thanks!
button keyboard
flutter textfield flutter-layout asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
add a comment |
How can I activate/deactivate a button based on the content of a TextFormField?
I want to make sure a user can only press Button X if the TextFormField has 10 entered numbers (if it's a mobile number).
Thanks!
button keyboard
flutter textfield flutter-layout asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
How can I activate/deactivate a button based on the content of a TextFormField?
I want to make sure a user can only press Button X if the TextFormField has 10 entered numbers (if it's a mobile number).
Thanks!
button keyboard
flutter textfield flutter-layout button keyboard
flutter textfield flutter-layout asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
asked Dec 28 '18 at 20:57
DrainBramageDrainBramage
123
123
add a comment |
add a comment |
1 Answer
1
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oldest
votes
A simple way would be to set the autovalidate property of our TextFormField to true. This will automatically detect for changes on our TextFormField widget. We can then try to check if our TextFormField's value has a String length of 10 characters on the validator property . After that we can call setState to enable or disable our button (I use FlatButton in this example).
bool _btnEnabled = false;
...
@override
Widget build(BuildContext context){
...
TextFormField(
...
autovalidate: true,
validator: (String txt){
if (txt.length == 10){
setState((){
_btnEnabled = true;
});
} else {
setState((){
_btnEnabled = false;
});
}
}
...
FlatButton(
onPressed: _btnEnabled == true ? yourCallback : null,
child: ...
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
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
A simple way would be to set the autovalidate property of our TextFormField to true. This will automatically detect for changes on our TextFormField widget. We can then try to check if our TextFormField's value has a String length of 10 characters on the validator property . After that we can call setState to enable or disable our button (I use FlatButton in this example).
bool _btnEnabled = false;
...
@override
Widget build(BuildContext context){
...
TextFormField(
...
autovalidate: true,
validator: (String txt){
if (txt.length == 10){
setState((){
_btnEnabled = true;
});
} else {
setState((){
_btnEnabled = false;
});
}
}
...
FlatButton(
onPressed: _btnEnabled == true ? yourCallback : null,
child: ...
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
add a comment |
A simple way would be to set the autovalidate property of our TextFormField to true. This will automatically detect for changes on our TextFormField widget. We can then try to check if our TextFormField's value has a String length of 10 characters on the validator property . After that we can call setState to enable or disable our button (I use FlatButton in this example).
bool _btnEnabled = false;
...
@override
Widget build(BuildContext context){
...
TextFormField(
...
autovalidate: true,
validator: (String txt){
if (txt.length == 10){
setState((){
_btnEnabled = true;
});
} else {
setState((){
_btnEnabled = false;
});
}
}
...
FlatButton(
onPressed: _btnEnabled == true ? yourCallback : null,
child: ...
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
add a comment |
A simple way would be to set the autovalidate property of our TextFormField to true. This will automatically detect for changes on our TextFormField widget. We can then try to check if our TextFormField's value has a String length of 10 characters on the validator property . After that we can call setState to enable or disable our button (I use FlatButton in this example).
bool _btnEnabled = false;
...
@override
Widget build(BuildContext context){
...
TextFormField(
...
autovalidate: true,
validator: (String txt){
if (txt.length == 10){
setState((){
_btnEnabled = true;
});
} else {
setState((){
_btnEnabled = false;
});
}
}
...
FlatButton(
onPressed: _btnEnabled == true ? yourCallback : null,
child: ...
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
A simple way would be to set the autovalidate property of our TextFormField to true. This will automatically detect for changes on our TextFormField widget. We can then try to check if our TextFormField's value has a String length of 10 characters on the validator property . After that we can call setState to enable or disable our button (I use FlatButton in this example).
bool _btnEnabled = false;
...
@override
Widget build(BuildContext context){
...
TextFormField(
...
autovalidate: true,
validator: (String txt){
if (txt.length == 10){
setState((){
_btnEnabled = true;
});
} else {
setState((){
_btnEnabled = false;
});
}
}
...
FlatButton(
onPressed: _btnEnabled == true ? yourCallback : null,
child: ...
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
answered Dec 28 '18 at 21:38
Jerome EscalanteJerome Escalante
59519
59519
add a comment |
add a comment |
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