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An InputDecorator, which is typically created by a TextField, cannot have an unbounded width.
TextField is the most commonly used text input widget. By default, a TextField is decorated with an underline. You can add a label, icon, inline hint text, and error text by supplying an InputDecoration as the decoration property of the TextField .
To create a row or column in Flutter, you add a list of children widgets to a Row or Column widget. In turn, each child can itself be a row or column, and so on. The following example shows how it is possible to nest rows or columns inside of rows or columns. The left column's widget tree nests rows and columns.
Step 1: Locate the file where you have placed the TextField widget. Step 2: Inside the TextField widget, add the decoration parameter and assign the InputDecoration widget. Step 3: Inside the InputDecoration widget, add the enabledBorder parameter and assign the OutlineInputBorder widget.
(I assume you're using a Row because you want to put other widgets beside the TextField in the future.)
The Row widget wants to determine the intrinsic size of its non-flexible children so it knows how much space that it has left for the flexible ones. However, TextField doesn't have an intrinsic width; it only knows how to size itself to the full width of its parent container. Try wrapping it in a Flexible or Expanded to tell the Row that you're expecting the TextField to take up the remaining space:
new Row(
children: <Widget>[
new Flexible(
child: new TextField(
decoration: const InputDecoration(helperText: "Enter App ID"),
style: Theme.of(context).textTheme.body1,
),
),
],
),
You get this error because TextField expands in horizontal direction and so does the Row, so we need to constrain the width of the TextField, there are many ways of doing it.
Use Expanded
Row(
children: <Widget>[
Expanded(child: TextField()),
OtherWidget(),
],
)
Use Flexible
Row(
children: <Widget>[
Flexible(child: TextField()),
OtherWidget(),
],
)
Wrap it in Container or SizedBox and provide width
Row(
children: <Widget>[
SizedBox(width: 100, child: TextField()),
OtherWidget(),
],
)
you should use Flexible to use a Textfield inside a row.
new Row(
children: <Widget>[
new Text("hi there"),
new Container(
child:new Flexible(
child: new TextField( ),
),//flexible
),//container
],//widget
),//row
As @Asif Shiraz mentioned I had same issue and solved this by Wrapping Column in a Flexible, here like this,,
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new Scaffold(
body: Row(
children: <Widget>[
Flexible(
child: Column(
children: <Widget>[
Container(
child: TextField(),
)
//container
],
))
],
mainAxisAlignment: MainAxisAlignment.spaceBetween,
),
));
}
}
The solution is to wrap your Text() inside one of the following widgets:
Either Expanded or Flexible. So, your code using Expanded will be like:
Expanded(
child: TextField(
decoration: InputDecoration(
hintText: "Demo Text",
hintStyle: TextStyle(fontWeight: FontWeight.w300, color: Colors.red)
),
),
),
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