Flutter Textfield Maxlength Detailed Explanation With Example

In this article, I will be implementing Flutter textfield maxlength, what’s its purpose, usage, and how to implement it in Flutter textfield. I will be implementing it step by step so you will have a detailed knowledge of how to implement Flutter textfield maxlength in Flutter textfield. Let’s now stop wasting your valuable time and start implementing Flutter textfield maxlength in the Flutter app.

What is Flutter Textfield Maxlength?

Flutter textfield maxlength, as the name suggests, it is used to specify the maximum length of characters that a Flutter textfield would have. It means that we can specify the length of input that the Flutter textfield will get from the user. Don’t worry, I will explain it using proper examples then you will understand it better. Let’s start implementing it in the next sections.

Implementing Flutter Textfield Maxlength

To implement and specify Flutter textfield maxlength, you have to use the max length constructor of the Flutter textfield. This constructor takes an integer value means a number without a decimal(e.g. don’t use 34.8). For demonstration, I have used a value 20 and have passed it to the max length constructor of Flutter textfield. See the below code for this:

TextField(
         maxLength: 20,
         )

After implementing the above code, you can see in the above image that we now have a counter in the bottom right side of the Flutter textfield. Now our textfield is bound to take only 20 inputs which you can see in the below image in which I have given it 20 inputs and now it’s not taking any more.

But if you still want the Flutter textfield to take more inputs than the specified Flutter textfield maxlength then see the next section to understand how to implement that as well.

Max Length Enforced

Using the max length enforced constructor of the Flutter textfield, you can extend the length of input but it will make the color of the Flutter textfield border and the Flutter textfield maxlength counter red as you can see in the below image.

 maxLengthEnforced: false

Making the max length enforced to be true which by default is true, will force the input to only take the number of inputs that is specified in the max length constructor.

Max Length Enforcement

It works like the max length enforced but unlike max length enforced, it is not deprecated, so you can use it instead of max length enforced. It is simple to implement, use the max length enforcement constructor of the Flutter textfield. See the code below:

maxLengthEnforcement: MaxLengthEnforcement.enforced

By implementing this, the input will not exceed the length that is specified in the max length constructor. Now let’s see the below code:

maxLengthEnforcement: MaxLengthEnforcement.none

Using this code, the input length can exceed the max length of the input but when it exceeds then the color of the Flutter Textfield border and the counter text becomes red.

You can hide the counter text. It can be used when you don’t want to show the counter but still want the max length to work and have a specific length. For that, see the below section to implement Flutter textfield max length hide.

Flutter Textfield Maxlength Hide

To hide the max length counter of the Flutter textfield, you can to use the counter text constructor of the input decoration class of the decoration constructor. For demonstration, I have passed it an empty string. See the below code:

decoration: InputDecoration(
                 counterText: '',
                           )

In the above image, you can see that the counter text is not showing now but the max length is working properly. I have inputted 20 characters and it’s not taking any more as I have set max length enforcement to be enforced. You can give the counter text any text you want or you can use some logic that if the length is greater than specified then show bad text and if it’s lesser than the max length then show good text depending on your Flutter app requirements. You can also style this counter text using the counter style constructor of the Flutter input decoration class.

Mesmerizing Flutter Textfield Source Code

import 'package:flutter/material.dart';
void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Homepage(),
    );
  }
}
class Homepage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
      body: Center(
          child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 40),
              child: TextField(
                style: TextStyle(color: Colors.purple),
                maxLength: 20,
                decoration: InputDecoration(
                    prefixIcon: Icon(
                      Icons.person,
                      color: Colors.purple,
                    ),
                    suffixIcon: Icon(
                      Icons.visibility,
                      color: Colors.purple,
                    ),
                    labelText: 'Enter your name',
                    labelStyle: TextStyle(color: Colors.purple.withOpacity(.8)),
                    enabledBorder: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.purple),
                        borderRadius: BorderRadius.circular(30).copyWith(
                            bottomRight: Radius.circular(0),
                            topLeft: Radius.circular(0))),
                    focusedBorder: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.purple),
                        borderRadius: BorderRadius.circular(30).copyWith(
                            bottomRight: Radius.circular(0),
                            topLeft: Radius.circular(0)))),
              ))),
    ));
  }
}

Conclusion

In conclusion, we have implemented and now have a complete understanding of how to implement Flutter textfield maxlength in the Flutter app. I look forward to having your valuable feedback and would love to see you at my other posts on amazing Flutter widgets, beautiful Flutter templates, and amazing Flutter animations. That’s it for this article. Thanks for reading.