Question 197375 in Flutter Question posted in
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Flutter TextEditingController value resets on widget build

I need to set the value of a TextEditingController during the widget build method.

The problem is that every time the widget rebuilds, the _controller value resets to to it’s original state and the new value disappears:

final TextEditingController _controller = new TextEditingController();

Widget _build(BuildContext context) {
   
   myString = "Value only available in widget build";

   new TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [FilteringTextInputFormatter.digitsOnly],
      controller: _controller..text = myString,
   ),

}

In the above example myString is declared during widget build. Unfortunately, it cannot be declared duing initState, hence my problem.

How can I set the _controller value only during the first build and prevent it from resetting to it’s original value after the widget rebuilds itself?

Any suggestions?

Tags:

2

Answers


  1. 0

    From what you are saying, you don’t need to use StoreConnector for widget you don’t want to update when updating your store. You could definitely do something like this:

    
String? myString;

Widget build(BuildContext context) {
   if (myString == null) {
     //Once myString is assigned it will not update.
     myString = StoreProvider.of<YourClass>(context).state.myString;
     _controller.text = myString;
   }
   return TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [FilteringTextInputFormatter.digitsOnly],
      controller: _controller,
   );
}

    Also, if you want to do it with StoreConnector<> you can do:

     return StoreConnector(
   builder: (context, value) {
     return TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [FilteringTextInputFormatter.digitsOnly],
      controller: _controller,
     );
   }, 
   rebuildOnChange: false, //Add this line to stop rebuilding when store changes.
 );
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  2. 0

    You can set text controller value into initState() of your page so it will be prevent it to reset after rebuild

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