Скачать или смотреть Creating a Dynamic Flutter Search Bar with Riverpod and Custom Suffix Icons

Discover how to build a `Flutter search bar` that dynamically updates its suffix icon based on user input, using Riverpod for efficient state management.
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This video is based on the question https://stackoverflow.com/q/77194386/ asked by the user 'Stefan de Kraker' ( https://stackoverflow.com/u/10352461/ ) and on the answer https://stackoverflow.com/a/77195006/ provided by the user 'Ruble' ( https://stackoverflow.com/u/17991131/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Building a Dynamic Flutter Search Bar with Riverpod

When developing Flutter applications, a common requirement is implementing a search feature that efficiently filters a list of items. In this guide, we’ll walk through creating a Flutter search bar enhanced with Riverpod, which allows us to manage the app's state seamlessly. We'll also learn how to change the suffix icon of the search bar based on user input. Let’s dive into the challenge you might face and how to address it effectively.

The Problem: Getting the Search Bar to Work

In a typical implementation of a search bar, you might want to have a text input field where users can type their queries. Moreover, to enhance user interaction, you might want to change the suffix icon (the icon displayed at the end of the text field) depending on whether the search input is empty or not. Here's what might go wrong:

You may notice that updating either the text input or the icon works, but not both simultaneously. This is a common issue when state management is not adequately handled.

Example Code Snippet

Here’s an example of how a simple TextField can be set up with Riverpod, but you’d find that the suffix icon doesn't change as expected.

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

The Solution: Using Additional Providers

To resolve the issue of the suffix icon not updating alongside the input text, we need to create an additional provider that specifically tracks whether the search input is empty.

Step-by-Step Implementation

Creating a New Provider:

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

This will allow us to determine whether the search bar’s content is empty without interfering with other state variables.

Updating the Overview Screen:
We will modify the OverviewScreen widget to utilize the new searchIsEmptyProvider for the suffix icon. Here’s how the new implementation looks:

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

Key Takeaways

By using a separate provider to check if the search string is empty, the suffix icon will render correctly based on the user’s input.

Consumer widget helps to only rebuild the suffix icon when its state changes, rather than re-rendering the entire OverviewScreen.

Always remember to create controllers like TextEditingController in the initState method and dispose of them in the dispose method. This prevents potential memory leaks and keeps your app running smoothly.

Conclusion

Implementing a dynamic search bar in Flutter with Riverpod is a straightforward process when you leverage additional state management appropriately. By incorporating the searchIsEmptyProvider, you can easily control the rendering of the suffix icon, providing a better user experience. Happy coding, and enjoy building your Flutter applications!