Скачать или смотреть Creating Flutter TextField Auto Complete Suggestions Using SQLite

Discover how to use SQLite to implement an auto-complete feature in Flutter's TextField. This guide covers loading data, updating widget state, and more!
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This video is based on the question https://stackoverflow.com/q/65267434/ asked by the user 'wingsQue info' ( https://stackoverflow.com/u/14255574/ ) and on the answer https://stackoverflow.com/a/65276911/ provided by the user 'Stefano Amorelli' ( https://stackoverflow.com/u/9367299/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing Auto-Complete Suggestions in Flutter with SQLite

In modern mobile applications, user experience is paramount. One effective way to enhance user experience is through the implementation of an auto-complete feature in input fields. This guide aims to address a common challenge for Flutter developers: how to create an auto-complete TextField using suggestions fetched from an SQLite database. We will explore a step-by-step solution to implement this feature, complete with code snippets.

The Challenge

Imagine you have a Flutter application in which users can input album names in a TextField. While hardcoding a list of suggestions works perfectly, integrating data from an SQLite database introduces complications. Specifically, the TextField does not filter items as expected when the suggestions are retrieved from the database. This leads to frustration and a poor UX.

The Solution

To successfully implement auto-complete suggestions from SQLite in Flutter, we need to address a few important aspects:

Ensure data is fetched asynchronously and the widget state is updated.

Call the item filtering function correctly.

Trigger the fetch function in the correct lifecycle stage of the widget.

Step 1: Setting Up Data Retrieval from SQLite

First, we need a function that retrieves the items from the database. You may already have code similar to this:

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

Make sure that this function is part of a database manager class.

Step 2: Updating the Widget State

In order for the TextField widget to recognize updates to the list of items, we need to use setState when we load the items:

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

Without wrapping this in setState, the widget won't refresh when new data is available.

Step 3: Triggering the Load Function

You should call _loadItems() in the initState method of your widget class. This ensures that item loading occurs at the appropriate time, right after the layout has been built:

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

Step 4: Building the Auto-Complete TextField Widget

Once you have your data in _itemsList, you can integrate it into your AutoCompleteTextField widget:

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

Complete Code Sample

Here’s how everything comes together in a simple Flutter application:

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

Conclusion

With these simple steps, you can integrate an auto-complete TextField in Flutter that fetches suggestions from an SQLite database. This implementation not only enhances user experience but also provides dynamic interaction based on user inputs. Make sure you test the app thoroughly to ensure all features function as expected.

For more tips on Flutter development or to troubleshoot any Flutter challenges, feel free to explore our other posts or connect with the community!