Скачать или смотреть How to Successfully Store Date Picker Values in Flutter Using a Dynamic List

In this guide, learn how to effectively manage and store date picker values in a Flutter app using a dynamic list. We will explore the solution to prevent losing previous selections and ensure that all values are saved successfully.
---
This video is based on the question https://stackoverflow.com/q/64889859/ asked by the user '龍が如く' ( https://stackoverflow.com/u/14504141/ ) and on the answer https://stackoverflow.com/a/64892128/ provided by the user 'Yuu Woods' ( https://stackoverflow.com/u/12458442/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Flutter add value to another class list

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Successfully Store Date Picker Values in Flutter Using a Dynamic List

Managing user input, especially dates, in a Flutter application can be tricky, especially when you want to maintain a list of selected dates. If you're facing the issue where only the latest date picker value is recorded, you are not alone. In this guide, we will discuss how to properly capture and store multiple date selections in a Flutter application, using a solution tailored for dynamic lists.

The Problem

You might come across a common hiccup when working with dynamic fields in Flutter—only the most recent selection of the date picker is retained. This can happen if you don't correctly handle the passing of data between different widget classes. In this case, we want the function addToDateList to append each selected date to a list, but instead, it creates a new instance of the stateful widget, resulting in the loss of previous selections.

Sample Code Structure

Here's a glimpse of the sample code structure we are working with:

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

This is where we need to make some important adjustments to ensure all selected dates are preserved.

The Solution

To resolve the issue and make sure that all the values are correctly stored in the list, we must follow several steps to update our code structure.

Step 1: Pass the Function as a Parameter

When creating instances of the AddFieldDynamicItem widget, we need to pass the addToDateList function as a parameter. This way, each instance can utilize the same function to add a date to the list.

Before:

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

After:

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

Step 2: Modify the Constructor

Update the constructor of the AddFieldDynamicItem class to accept this new function:

Before:

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

After:

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

Step 3: Update the Date Selection Logic

Lastly, update the method that checks if a date was selected from the date picker. Instead of creating a new instance of _AddFieldDynamicTest, we can simply call the function passed through the widget.

Before:

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

After:

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

Final Code Snippet

After these changes, your updated AddFieldDynamicItem class should look similar to this:

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

Conclusion

By following the above steps, you can effectively manage and store multiple date selections without losing previous values. This solution ensures that each instance of the AddFieldDynamicItem widget appropriately communicates with the list in the parent widget, allowing for a seamless experience when adding dates.

Now you're ready to enhance your Flutter app with a dynamical date selection feature that works reliably. Happy coding!