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Learn how to restrict user input suggestions in Flutter TypeAhead component to show only backend suggestions, improving user experience.
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This video is based on the question https://stackoverflow.com/q/73310544/ asked by the user 'Dillon Shah' ( https://stackoverflow.com/u/15180313/ ) and on the answer https://stackoverflow.com/a/73311232/ provided by the user 'Wissam Sbenaty' ( https://stackoverflow.com/u/13788351/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Hide User Input Suggestions in Flutter TypeAhead

When building a Flutter application that requires user input, the TypeAhead widget can be an excellent choice for suggesting options based on what the user is typing. However, a common issue developers encounter is that the first suggestion often turns out to be the user’s own input. This can create a frustrating experience when users are looking for suggestions from a wider array of options. In this guide, we’ll look at a straightforward solution that allows you to limit suggestions to only those retrieved from your backend, effectively hiding the user's input.

Understanding the Problem

Imagine a scenario where a user is typing in a search field to tag friends or find suggestions. When they input text, the TypeAhead widget, by default, might suggest the exact text they have just entered before displaying any other relevant suggestions. This behavior can be counterproductive, as it clutters the suggestion list and does not provide any real value to the user.

The Default Behavior

User Input Suggestion: The first suggestion is always the exact text entered.

Cluttered User Experience: Users may get confused when their input appears as a suggestion.

The Proposed Solution

To restrict the display of suggestions to only those from the backend, we can modify the way the suggestions are processed in the TypeAheadField widget.

Step-by-Step Implementation

Identify the Suggestion Callback:
In the TypeAheadField, locate the suggestionsCallback which fetches suggestions based on the user input.

Filter Suggestions:
Modify the part of your code where suggestions are returned. You will filter out the user’s input from the suggestions before they are displayed.

Code Example

Here’s how you can implement the change. Replace the line that returns suggestions in your current code with the following:

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

Explanation of the Change

Filtering Mechanism: The line of code uses the where method to filter the suggestions, ensuring that any suggestion equivalent to the user’s input is removed from the list.

Conversion to List: By converting the filtered suggestions to a list, you prepare them for display in the user interface.

Conclusion

By implementing the above modifications, you can enhance the usability of the TypeAhead widget in your Flutter applications. Users will now only see relevant suggestions from your backend, and not their own input, leading to an improved, more focused experience.

Make sure to test this functionality thoroughly within your application to ensure it meets your expectations!

If you have any questions or further suggestions on this topic, feel free to share in the comments below!