Скачать или смотреть How to Save Data from Autogenerated TextFields in Flutter

Discover how to effectively save data from autogenerated TextFields in Flutter, ensuring you maintain accurate inputs without duplicates.
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This video is based on the question https://stackoverflow.com/q/68429354/ asked by the user 'Brian Ngeywo' ( https://stackoverflow.com/u/12801620/ ) and on the answer https://stackoverflow.com/a/68429497/ provided by the user 'ישו אוהב אותך' ( https://stackoverflow.com/u/4758255/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Save Data from Autogenerated TextFields in Flutter: A Step-by-Step Guide

Developing a Flutter application can sometimes lead you to face unexpected challenges. One such challenge arises when you need to create multiple TextFields dynamically, depending on user input. In this guide, we'll address a common problem developers face: how to save data generated from a list of TextFields while ensuring that changes to input values do not generate duplicates.

The Problem

Imagine you are building an app that allows users to select the number of bedrooms in an apartment. Based on their selection, you automatically generate a corresponding number of TextFields for price input. If not handled properly, changes made to these fields can lead to the creation of extra entries, making it difficult to manage the data effectively.

User Scenario

A user selects 1 and 2 for bedrooms.

Two TextFields appear for the user to input prices for the selected bedrooms.

Changes to these fields should update stored prices without creating duplicates.

The Solution: Using a Map for TextEditingControllers

To efficiently manage the input from these dynamic TextFields without generating duplicates, we can use a Map to store TextEditingController instances. This approach will ensure that you maintain a single controller for each TextField based on its index.

Step 1: Define the Map

To begin, we will create a Map that will hold our TextEditingController instances:

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

Step 2: Create a Controller Getter Function

We need a function that checks if a controller already exists for a specific index. If it does not, this function will create one:

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

Step 3: Implement the TextField

When creating your TextFormField, use the _controllerOf function to fetch the appropriate controller:

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

Step 4: Extracting Text from the Controllers

Once prices are entered in the TextFields, you need a way to extract this data without duplicates. Create a function that will compile the text into a list:

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

Conclusion

With these simple yet effective steps, you can manage dynamically generated TextFields in your Flutter application efficiently. By using a Map, you're able to create a clear relationship between the indexes of your TextFields and their corresponding controllers, ensuring that user input is captured accurately without duplicating entries.

It's important to note that while the code provided has not been tested in a live environment, it offers a structured approach to solving text field management in Flutter.

Feel free to try out this method in your next Flutter project and enjoy a hassle-free user experience!