How to Dynamically Add New TextFormField in Flutter When Button is Pressed

Learn how to create a dynamic form in Flutter that allows users to add new text fields when a button is pressed, enhancing user interaction and experience.
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How to Dynamically Add New TextFormField in Flutter When Button is Pressed

Creating user-friendly forms is an essential part of mobile app development. In Flutter, you may often find yourself needing to add fields dynamically based on user interaction. One common scenario is adding a new TextFormField when a button is pressed. This article will guide you through the steps to implement this functionality.

The Problem: Adding a New Text Field

You have a screen with an existing username field. Your goal is to allow users to add another input field when they press a submit button. The challenge is to manage the state of your form and dynamically show a new input field based on user action.

The Solution: Using Stateful Widgets and Visibility

To achieve this, you can use a StatefulWidget to manage the state of the additional text field. Here's a step-by-step breakdown:

Step 1: Set Up Your Stateful Widget

Start by creating a StatefulWidget. This will allow you to change the widget’s state dynamically. Add a boolean variable to track whether to display the new text field:

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

Step 2: Create the Form Layout

Within your widget's build method, you can create your form layout. Initially, you will only include the username text field. Here’s how your setup will look:

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

Step 3: Add the Submit Button

Include a button that, when pressed, will set the _displayNewTextField variable to true. This can be accomplished using the setState method:

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

Step 4: Include the New Text Field Conditionally

To conditionally display the new text field, use the Visibility widget based on your boolean state:

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

Full Example Code

Here’s how your full implementation might look:

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

Conclusion

With the steps outlined above, you now have a dynamic form in Flutter that allows users to add new input fields effortlessly. By leveraging a StatefulWidget and Visibility, you can enhance the interactivity of your forms, ultimately improving user experience.

Feel free to adjust and expand upon this code to suit your application’s specific needs!