How to Filter JSON Data in Flutter

Learn how to efficiently filter JSON data in Flutter by chapter selection. This guide provides a step-by-step approach to data handling in Flutter applications using Dart.
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How to Filter JSON Data in Flutter: A Complete Guide

When building a Flutter application, you may encounter scenarios where you need to display specific data based on user preferences or selections. One common challenge is filtering JSON data. In this post, we will explore how to achieve this by filtering out data from a JSON file based on user-selected chapters.

The Problem

You have a JSON file that contains a list of items representing chapters and verses. After fetching this data into your Flutter application, you want to allow users to filter the content based on the chapter they select.

Example JSON Structure

Here’s a quick look at the structure of the JSON data we are dealing with:

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

In our case, we want to be able to show the items relevant to a selected chapter, for instance, chapter 1.

The Solution

1. Loading JSON Data

Firstly, we need to read and load the JSON data into a list. Here’s how you can do it using Dart's rootBundle:

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

In this snippet, we load the JSON file located in the assets/json directory, decode it, and then store it in the _amh list for later use.

2. Filtering Data by Chapter

Now that we have the data loaded, we can create a method to filter the data based on the chapter number selected by the user.

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

This function takes an integer chapter as a parameter and returns a list of items that match that chapter using Dart's where method.

3. Displaying the Filtered Data

Assume at this point you have a variable _selectedChapter which indicates the chapter chosen by the user. Here’s how we can display the corresponding verses using a ListView:

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

Explanation of Code

itemCount: The number of items in the filtered list.

itemBuilder: A function that builds the UI for each item in the list.

Conclusion

By following the steps outlined above, you can effectively filter JSON data in your Flutter applications based on user-selected values. This capability enhances user experience by allowing for dynamic data presentation tailored to individual preferences.

Now that you've learned how to filter JSON data in Flutter, you can apply this knowledge to create more robust and flexible applications!