Скачать или смотреть How to Print Any Value Dynamically with Flutter's TextFormField

Discover how to dynamically print values based on user input in Flutter's TextFormField. Follow this comprehensive guide for a step-by-step solution.
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This video is based on the question https://stackoverflow.com/q/67965471/ asked by the user 'Macchiato' ( https://stackoverflow.com/u/15957792/ ) and on the answer https://stackoverflow.com/a/67965831/ provided by the user 'Apb' ( https://stackoverflow.com/u/16100934/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When working with user input in Flutter, it’s essential to respond to changes in real-time, especially when displaying outputs based on the text entered in a TextFormField. This article aims to resolve a common issue where you want to print a specific output immediately after the user types in a value.

The Problem

Suppose you have a TextFormField for entering a number, and you want to display a corresponding word (like "one" for 1, "two" for 2, etc.) instantly each time the user changes the input. How can you achieve that with Flutter?

Solution Overview

We'll accomplish this by creating a StatefulWidget that updates its state when the text in the TextFormField changes. Here's how you can go about it, step-by-step.

Step 1: Setting Up the Stateful Widget

First, you need to define a StatefulWidget. This will allow us to maintain the state of the input and display data based on that.

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Step 2: Creating the judul Function

Next, we will build the function judul which will take the input value and return the corresponding text. Here’s how it can look:

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Step 3: Building the User Interface

In the build method of your StatefulWidget, set up the TextFormField and display the output using a Text widget. Make sure you update the state whenever the text in the input field changes.

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

Conclusion

With the structure above, your app will now dynamically print out written responses in line with user inputs.

Benefits of this Approach

Real-time Feedback: Users see the response instantly as they type.

Stateful Management: Using setState, the widget properly updates whenever the input changes.

Final Thoughts

Implementing dynamic text output based on input in Flutter is straightforward. By leveraging a StatefulWidget and carefully managing state, you can create an engaging user experience.

If you have any further questions or need assistance with your Flutter projects, feel free to reach out!