How do you change the value inside of a textfield flutter

Question

I have a TextEditingController where if a user clicks a button it fills in with information  I can t seem to figure out how to change the text inside of a Textfield or TextFormField  Is there a solution

User · Answer

The problem with just setting   controller text    New value     is that the cursor will be repositioned to the beginning  in material s TextField   Using   controller text    Hello    controller selection   TextSelection fromPosition      TextPosition offset   controller text length      setState           is not efficient since it rebuilds the widget more than it s necessary  when setting the text property and when calling setState    --   I believe the best way is to combine everything into one simple command   final  newValue    New value    controller value   TextEditingValue        text   newValue        selection  TextSelection fromPosition          TextPosition offset   newValue length                     It works properly for both Material and Cupertino Textfields

User · Answer

simply change the text or value property of controller  if you do not edit selection property cursor goes to first of the new text  onPress                 controller value TextEditingValue text   quot sample text quot  selection  TextSelection fromPosition TextPosition offset  sellPriceController text length                                      or in case you change the  text property   onPress                 controller text  quot sample text quot             controller selection   TextSelection fromPosition TextPosition offset  controller text length                               in cases that do not matter to you just don t change the selection property

User · Answer

Simply change the text property      TextField        controller  txt             RaisedButton onPressed               txt text    My Stringt             while txt is just a TextEditingController    var txt   TextEditingController

User · Answer

mytexteditingcontroller value   new TextEditingController fromValue new TextEditingValue text   My String    value    This seems to work if anyone has a better way please feel free to let me know

User · Answer

TextEditingController    text    quot new text quot

User · Answer

Using this solution  you will also be able to put the cursor at the end of newly text    final TextEditingController  controller   TextEditingController      override Widget build BuildContext context      return Scaffold      body  Center child  TextField controller   controller        floatingActionButton  FloatingActionButton        onPressed                controller text    Hello               this changes cursor position          controller selection   TextSelection fromPosition TextPosition offset   controller text length            setState

User · Answer

If you simply want to replace the entire text inside the text editing controller  then the other answers here work  However  if you want to programmatically insert  replace a selection  or delete  then you need to have a little more code  Making your own custom keyboard is one use case for this  All of the inserts and deletions below are done programmatically   Inserting text The  controller here is a TextEditingController for the TextField  void  insertText String myText      final text    controller text    final textSelection    controller selection    final newText   text replaceRange      textSelection start      textSelection end      myText         final myTextLength   myText length     controller text   newText     controller selection   textSelection copyWith      baseOffset  textSelection start   myTextLength      extentOffset  textSelection start   myTextLength          Thanks to this Stack Overflow answer for help with this  Deleting text There are a few different situations to think about   There is a selection  delete the selection  The cursor is at the beginning  don   t do anything  Anything else  delete the previous character   Here is the implementation  void  backspace       final text    controller text    final textSelection    controller selection    final selectionLength   textSelection end - textSelection start        There is a selection    if  selectionLength  gt  0        final newText   text replaceRange        textSelection start        textSelection end                        controller text   newText       controller selection   textSelection copyWith        baseOffset  textSelection start        extentOffset  textSelection start             return            The cursor is at the beginning    if  textSelection start    0        return            Delete the previous character   final newStart   textSelection start - 1    final newEnd   textSelection start    final newText   text replaceRange      newStart      newEnd                  controller text   newText     controller selection   textSelection copyWith      baseOffset  newStart      extentOffset  newStart          Full code You can find the full code and more explanation in my article Custom In-App Keyboard in Flutter

User · Answer

You can use the text editing controller to manipulate the value inside a textfield  var textController   new TextEditingController     Now  create a new textfield and set textController as the controller for the textfield as shown below   new TextField controller  textController   Now  create a RaisedButton anywhere in your code and set the desired text in the onPressed method of the RaisedButton  new RaisedButton         onPressed                 textController text    quot New text quot

User · Answer

First Thing   TextEditingController MyController  new TextEditingController     Then add it to init State or in any SetState     MyController value   TextEditingValue text   quot ANY TEXT quot

User · Answer

step 1  Declare TextEditingController   step 2  supply controller to the TextField   step 3  user controller s text property to change the value of the textField   follow this official solution to the problem

User · Answer

Here is a full example where the parent widget controls the children widget  The parent widget updates the children widgets  Text and TextField  with a counter   To update the Text widget  all you do is pass in the String parameter  To update the TextField widget  you need to pass in a controller  and set the text in the controller   main dart   import  package flutter material dart    void main     gt  runApp MyApp      class MyApp extends StatelessWidget      override   Widget build BuildContext context        return MaterialApp        title   Demo         home  Home                  class Home extends StatelessWidget      override   Widget build BuildContext context        return Scaffold          appBar  AppBar            title  Text  Update Text and TextField demo                       body  ParentWidget            class ParentWidget extends StatefulWidget      override    ParentWidgetState createState     gt   ParentWidgetState       class  ParentWidgetState extends State lt ParentWidget gt      int  counter   0    String  text    no taps yet     var  controller   TextEditingController text   initial value       void  handleTap         setState             counter    counter   1         text    number of taps       counter toString           controller text     number of taps       counter toString                    override   Widget build BuildContext context        return Container        child  Column children   lt Widget gt           RaisedButton            onPressed   handleTap            child  const Text  Tap me   style  TextStyle fontSize  20                       Text    text            TextField controller   controller

[flutter] How do you change the value inside of a textfield flutter?

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