Question 290827 in Flutter Question posted in
The official Flutter documentation can be found here.

How to filter all values in JSON object in dart / flutter?

I am trying to implement a search function where I search through all values in a JSON object without knowing the keys beforehand.

It goes something like this:

object.where((o) => o['name'].contains(searchString))

but notice that I have to specify the key ‘name’ to search through this part of the JSON. I want to be able to search through the entire JSON object and I don’t know what the keys would be ahead of time.

Is there a way to do this?

Tags:

2

Answers


  1. 0

    If I understand you correctly, what you need is only traversing all values:

    bool check(o) {
  final values = o.values;
  for (final value in values) {
    if (value.contains(searchString) {
      return true;
    }
  }
  return false;
}

object.where((o) => check(o)).toList()
    Login or Signup to reply.
  2. 0

    Another approach could be

    void main() {
  List<Map<String, dynamic>> objects = [
    {'name': 'John Doe', 'age': 25},
    {'name': 'Jane Smith', 'age': 30},
    {'name': 'Alice Wonderland', 'age': 22},
  ];

  String searchString = 'Doe';

  // Filter the list of maps based on the 'name' containing the searchString
  List<Map<String, dynamic>> filteredList = objects
      .where((map) => map['name'].toString().contains(searchString))
      .toList();

  // Print the filtered list
  print(filteredList);
}

    but I’m not sure about the structure of your map

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search