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Learn how to dynamically update text fields in Flutter forms by connecting user selections to text editing controllers using the Flutter Form Builder package.
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Flutter: How to Assign a Value from a Selection to a Text Editing Controller

When developing forms in Flutter, particularly one that handles user input like contact information, you might encounter a common scenario: you want to populate different text fields based on user selections. For instance, let's say you have fields for a contact's name and phone number. If a user taps on a contact from a list, the fields should update automatically to reflect the selected contact's details. If you're using the TypeAheadFormField component from the Flutter Form Builder package, this post will help you achieve that by assigning values correctly to your text controllers.

The Problem

You may find yourself in a situation where, after selecting a contact's name using the TypeAheadFormField, the corresponding phone number does not update in the phone number field as you switch choices. This can be frustrating, especially when you have a working setup for the name field but can't get the phone number to behave in a similar way.

Example Usage

Let's consider a very basic setup where your form contains a name and phone number input. You have a working TypeAheadFormField that allows users to select a contact, but the phone number field does not update as expected. Here’s a brief breakdown of the issue:

Contact Selection: The user selects a contact's name.

Field Update Problem: The contact's phone number should automatically display in a separate text field but does not.

The Solution

The key to solving this issue lies in the proper use of the onSuggestionSelected function. This function is triggered when a user selects a suggestion from the autocomplete list. To update the phone number based on the selected contact, follow these guidelines.

Step-by-Step Implementation

Use the onSuggestionSelected Callback:
The onSuggestionSelected callback gives you the selected customer object, which contains all the information you need. Update your phone number field with the following code:

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

Ensure the Text Field is Editable:
If you want the mobile number to be editable, you may remove the readOnly: true property from the FormBuilderTextField for mobile. If you want it to be read-only to prevent user input, that's perfectly fine as well.

Example:

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

Complete Form Structure:
Make sure your form structure is correct. With the TypeAheadFormField, ensure that it is set up correctly to use the customer list, and the onSuggestionSelected callback is properly linked.

Final Code Snippet

Your build method involving the TypeAheadFormField and the mobile text field should look similar to this:

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

Conclusion

By correctly using the onSuggestionSelected callback to update the _mobileController.text with the selected customer's mobile number, you can create a responsive form that enhances user experience. Remember that communication with your controllers is crucial for maintaining a dynamic and interactive UI in Flutter.

Feel free to experiment with different configurations and ensure your database is properly set up to provide accurate customer data. Happy coding!