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Learn how to conditionally hide widgets in Flutter based on user age. This guide covers using Visibility widgets and age calculations to enhance user experience.
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This video is based on the question https://stackoverflow.com/q/66677964/ asked by the user 'Mahmoud Al-Haroon' ( https://stackoverflow.com/u/6317695/ ) and on the answer https://stackoverflow.com/a/66678038/ provided by the user 'MindStudio' ( https://stackoverflow.com/u/13406356/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Hiding Widgets in Flutter Based on Age Criteria: A Step-by-Step Guide

In Flutter development, you may encounter situations where you need to show or hide widgets based on user input or specific criteria. One common use case is to hide a widget when a user's age is below a certain threshold—in this case, 18 years old. This can enhance the user experience by ensuring that only relevant information is displayed based on the age of the user.

In this guide, we’ll walk you through how to achieve this by utilizing Flutter's Visibility widget and the DateTime functionalities. By the end, you'll know exactly how to implement conditional widget visibility based on a user’s selected birthday.

The Problem: Age-Based Widget Visibility

Imagine your app includes a form that requires users to enter their passport number only if they are 18 years or older. This means you'll need to check the user's age based on their birth date, which they select from a calendar widget. If the user is younger than 18, the passport number entry should be hidden.

Scenario

You have a Birthday widget that captures the birth date, and based on this date, you want to conditionally display a CustomTextFormField for passport number input. Here’s how you can do this effectively in Flutter.

The Solution: Utilizing Visibility Widget

To conditionally control the display of your CustomTextFormField, you'll wrap it with the Visibility widget. The Visibility widget allows you to easily hide or show a child widget depending on the boolean value provided to its visible property.

Steps to Implement

Wrap the Widget with Visibility: By wrapping the CustomTextFormField in the Visibility widget, you can control its visibility based on the age calculation.

Calculate Age: To determine if the user is 18 years or older, you can calculate the age by comparing the current date with the selected birthday.

Implementation: Below is the implementation code showing how to hide or display the widget based on the age.

Example Code

Here's how to modify your widget to include the Visibility condition:

[[See Video to Reveal this Text or Code Snippet]]

Additional Code Considerations

Alternatively, if you prefer not to use the Visibility widget, you can conditionally render the CustomTextFormField directly using an if statement as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By implementing the above strategies, you can effectively manage the visibility of widgets based on calculated age criteria in your Flutter application. This not only enhances the usability of your app but also improves the overall user experience by presenting relevant fields based on individual user data.

Feel free to leverage the snippets and techniques shared in this blog to ensure your applications remain intuitive and user-friendly. As always, testing is essential to ensure that the widget behaves as expected across different scenarios.

With Flutter's powerful state management and widget system, managing the visibility of elements has never been easier. Happy coding!