If you have used Flutter for developing mobile apps, one feature you must have enabled in your Flutter app for collecting data of users? Guess what? Inquiry form.
This inquiry form is used to collect the information of users. But what if users fill out your form and your app couldn’t protect that data? Have you ensured the app has a strong form validation ability? Before you hire flutter app developers, it is critical to make sure your developers build secured and right validation techniques in your Flutter app.
Being a Flutter developer I know where most developers make mistakes. Hence, to guide you on this critical aspect, I will tell you what is the best way to make a validation form in Flutter?
But before that, do you even know
Why use a form in your Flutter app?
In Flutter app development, developers get two choices for gathering user data. The first choice includes whether you have a simple field requirement. And the second choice involves do you have advanced requirements. In the first case, there is no need to create a form.
Hence, Flutter developers here should choose the ‘No Form’ option. And for the second case, they should choose the Form widget. And Form Widget is used for developing a form backed with strong data validation. Learn more about apk
So let’s see
How to Add a Form in the Flutter app?
This is a purely technical part meant for Flutter developers only. The developer must hold a basic understanding of the Dart programming language. It is because this language is used to write the code for enabling form into the app. As we said, creating a secure and validation proof form is highly critical because it impacts the privacy and security of users’ data.
And this task becomes even more crucial in the case of enterprise-scale mobile apps. Hence, in this case, try to take help from a dedicated Flutter app development company.
Now, let’s begin the form-adding process in Flutter.
For this, open Register.dart and you will find some pre-defined code instructions. Here, you need to find the line with TODO 1: and wrap the Container with the Form.
Keep a note. In case you rebuild and run the application, you won’t see any difference.
Now understand what are the keys
Each Flutter widget has a key. These keys enable Flutter to track where and how to redraw widgets efficiently.
Many times, Flutter developers assign a key value. But, here, they can ignore them. Why? It is because omitting unnecessary keys makes your code tighter and simpler. For instance, stateless widgets don’t need keys since their internal state is always the same.
Here, we will focus on a specific key subclass, the GlobalKey. These keys are particularly built to work with StatefulWidgets and allow other widgets to access the widget’s state by currentState.
To add a form you will have two methods. One is validate() and the other is save(). Now you need to follow the below steps to enable a form backed with a validation process.
Apply Validating a Simple TextFormField
There is a certain code to enable this function. Below I have mentioned what role this code plays in this case.
- To use regular expressions to match strings or parts of strings.
- To give some information to the user when the email address is blank.
- To tell users about the non-valid email address
- For more specific cases, refer to Dart RegExp docs
After this process, you can associate the validator with the email field.
Now you can start the form validation implementation process. And once you finish it completely, you have to add functionality for
Validating Password
Password validation is crucial to ensure users fill the strong and correct password. This is a critical process since any loopholes or weak algorithms can hamper the security of user data. Therefore, Flutter developers here should pay close attention.
Try to create a unique method that makes sure users’ passwords perfectly meet your security standards. You can set definite password creation guidelines to help users in this stage. To enable a password validation method in Flutter, follow the below steps.
- Define certain password-filling rules for your app
- Check password length
- Confirm the password must include a minimum of one uppercase alphabetic character
- Then, a minimum of one lowercase alphabetic character
- Ensure it contains at least one numeric character
- Confirm it has a minimum of one special character
- Enable the null option to express there is no message to return when the entered password meets your defined requirements.
Using Another Option: Autovalidate
By following this process a flutter developer can successfully enable validation functionality in the app. This will now help you ensure your Flutter app safely and accurately collects user data. And also keep it safe in the system. However, there is another option available for enabling the form validation functionality of your app. And that is auto validate.
Auto Validation happens when the user makes any kind of changes to his data. In this case, users don’t require submitting the form option to enable the validation. Just by typing one character, it activates the validators.
To Wrap Up
Adding a form validation is nothing new. Any beginner-level Flutter developer can enable this function in the app. The only important thing to ensure is to define strong password creation parameters and ask users to fill in valid info. And the above steps can help you create this process in your Flutter app.
However, there are still different ways of form validation in UI. For example, block libraries. But since all methods are purely teaching and coding processes, you need to do it with the help of experts. Therefore, if you are developing a business mobile app, try to work with the top mobile app development company that is proficient in Flutter development.
About the Author
Josephine Baker is a Flutter App Developer at MobileCoderz- a globally renowned mobile app development company that provides best-in-class mobile app solutions to a variety of industries. She has been developing mobile apps using the Flutter framework for the last 4 years. She has extensive knowledge of JavaScript and Dart programming language. Aside from this, She usually likes to read tech magazines and participate in social welfare campaigns.
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