Form Validations using GetX in Flutter

Published December 16, 2021


GetX is an extra-light and powerful solution for Flutter. It combines high-performance state management, intelligent dependency injection, and route management quickly and practically.

So, In today's tutorial, we will see how you can get validations in Flutter using GetX

Let's start

Step 1: Create a new Flutter Application

Step 2: Add a line like this to your package's pubspec.yaml

dependencies:
  get: ^4.6.1

 

Step 3: Now once we have installed the package we will get access to GetX functions and suppose we have Email, Password, Phone Number, and Name in your Form

So, first, you will declare all the controllers as TextEdtingController for your fields

then we will get access to your text using

texteditingcontroller.text

 

Step 4: Now we can pass these text in inside GetX Functions such as 

GetUtils.isLengthGreaterThan(nameController.text, 6): This will check if the length of the string is less then 6 letters.

GetUtils.isPhoneNumber(phoneController.text): This will check if the given number is a phone Number.

GetUtils.isEmail(emailController.text): This will check if the given input is an email.

you can use this inside ontap property to check for Validations.

onPressed: () {

                  setState(() {

                    GetUtils.isLengthGreaterThan(nameController.text, 6)

                        ? print('Name is valid')

                        : print('Name is invalid!!!');

                    GetUtils.isPhoneNumber(pwdController.text)

                        ? print('Phone Number')

                        : print('Not a Phone Number');

                    GetUtils.isEmail(emailController.text)

                        ? print('Email is valid')

                        : print('Email is invalid!!!');

                  });

                },

 

Full Source Code to try:

import 'package:flutter/material.dart';

import 'package:get/get.dart';

void main() {

  runApp(

      GetMaterialApp(debugShowCheckedModeBanner: false, home: Validations()));

}

class Validations extends StatefulWidget {

  const Validations({Key? key}) : super(key: key);

  @override

  _ValidationsState createState() => _ValidationsState();

}

 

class _ValidationsState extends State<Validations> {

  @override

  Widget build(BuildContext context) {

    final nameController = TextEditingController();

    final pwdController = TextEditingController();

    final emailController = TextEditingController();

 

    return Scaffold(

      appBar: AppBar(

        title: Text('Validations'),

      ),

      body: Padding(

        padding: const EdgeInsets.all(8.0),

        child: Column(

          children: [

            TextFormField(

              controller: nameController,

              decoration: InputDecoration(

                  border: OutlineInputBorder(

                      borderRadius: BorderRadius.circular(5)),

                  enabledBorder: OutlineInputBorder(

                      borderRadius: BorderRadius.circular(5)),

                  focusedBorder: OutlineInputBorder(

                      borderRadius: BorderRadius.circular(5)),

                  hintText: ' name...'),

            ),

            const SizedBox(

              height: 20,

            ),

            TextFormField(

              controller: pwdController,

              keyboardType: TextInputType.number,

              decoration: InputDecoration(

                hintText: ' phone',

                border:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

                enabledBorder:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

                focusedBorder:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

              ),

            ),

            const SizedBox(

              height: 20,

            ),

            TextFormField(

              controller: emailController,

              decoration: InputDecoration(

                hintText: ' email...,',

                border:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

                enabledBorder:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

                focusedBorder:

                    OutlineInputBorder(borderRadius: BorderRadius.circular(5)),

              ),

            ),

            TextButton(

                onPressed: () {

                  setState(() {

                    GetUtils.isLengthGreaterThan(nameController.text, 6)

                        ? print('Name is valid')

                        : print('Name is invalid!!!');

                    GetUtils.isPhoneNumber(pwdController.text)

                        ? print('Phone Number')

                        : print('Not a Phone Number');

                    GetUtils.isEmail(emailController.text)

                        ? print('Email is valid')

                        : print('Email is invalid!!!');

                  });

                },

                child: const Text("Validate"))

          ],

        ),

      ),

    );

  }

}

 

Output:

If Data entered in Invalid

 

If Data entered is correct

 

Conclusion: In this way, we have seen how you can use GetX and its Functions to get validations for your text fields in Flutter.

 


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