How to Make Fields Required and Save Dropdown and Text Data in Flutter Forms

Описание: Discover how to make your form fields required and save dropdown and text input data in `Flutter`. Follow our detailed guide to enhance your app.
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This video is based on the question https://stackoverflow.com/q/67412503/ asked by the user 'Bhaskar2510' ( https://stackoverflow.com/u/15739854/ ) and on the answer https://stackoverflow.com/a/67415744/ provided by the user 'Fatima ayaa' ( https://stackoverflow.com/u/15106159/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make Fields Required and Save Dropdown and Text Data in Flutter Forms

Creating user-friendly forms in your Flutter application can sometimes pose challenges, especially when it comes to ensuring all fields are filled out correctly before submission. This post will guide you through making fields required and saving the values from dropdowns and text inputs after the submit button is pressed.

The Problem

Imagine you have a form that includes several dropdown menus and a text field, but you find that the user is not prompted to fill these fields correctly. Moreover, you struggle with saving the submitted data once users hit the submit button. This can lead to user frustration and wasted time when they need to refill the form.

If you’ve encountered issues like needing validation for these fields and capturing user input effectively, don’t worry—we've got you covered!

The Solution

Let's break down our solution into a couple of parts: validating fields and saving data after submission.

1. Validating Fields

Validating Text Input
To ensure that the text input is filled, you need to use a validator function with the TextFormField widget. Here’s how it looks:

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

This snippet checks if the textbox is empty when the form is submitted. If it is, it displays an appropriate error message.

Validating Dropdowns
To ensure the dropdown menus are validated, replace DropdownButton with DropdownButtonFormField, which has built-in support for validation. Here’s an example with a dropdown menu for “Marked To”:

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

2. Saving Data on Submit

To implement saving functionality, you need to check if the form is valid before performing any save actions. Update your submit button logic like this:

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

This ensures that only valid data is processed—if the form is valid, you can execute the logic needed to save the data.

3. Adding Required Field Indicators

To visually indicate that a field is required, you can use a RichText widget to show an asterisk (*) next to the label for required fields.

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

This snippet will make it clear to users which fields are mandatory at a glance.

Conclusion

By integrating these validation techniques and methods for saving user data, your Flutter forms will become more intuitive and user-friendly. Always ensure users are well-informed about required fields to minimize errors and improve their experience.

Feel free to customize the examples provided to fit your application's needs, and happy coding!