Question 76208 in Flutter Question posted in
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Search item from list in multiple element – Flutter

I have search field that filter my list and it works fine, but I want to filter list by multiple elements

My list:

List<Product> _p = [
  Product(
   title : 'P1',
   info : 'just Football',
   seller : 'me',
  ),
  Product(
   title : 'P2',
   info : 'just Football',
   seller : 'other',
  ),
]

filter method

List<Product> filterByText(text){
    return _p.where((element) =>
        element.title.contains(text) ||
        element.info.contains(text) ||
        element.seller.contains(text)
  ).toList();
}

I want, when I type Football other in TextFormField, to get this item:

Product(
 title : 'P2',
 info : 'just Football',
 seller : 'other',
),

Instead, it returns an empty list. It worked when I type just other. How can I filter with multiple elements by single string?

Tags:

2

Answers


  1. 0

    There are many ways to do this. I’ll go with one approach:

    You can implement Product‘s toString() method like so:

    @override
String toString() {
  return '$title $info $seller'; // You can add other fields here if needed.
}

    Now, implement a fuzzy search, for filterByText. To do this, you can use an existing package like https://pub.dev/packages/fuzzywuzzy.

    List<Product> filterByText(text) {
  return extractTop(
    query: text,
    choices: _p,
    cutoff: 10, // You can choose another cutoff
    // You can choose another number of results
    // or show all using a different method
    limit: 4,
    getter: (x) => x.toString(),
  ).map((result) => result.choice).toList();
}

    You don’t have to necessarily implement toString() you can also just write '${x.title} ${x.info} ${x.seller}' in the getter field of extractTop directly.

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  2. 0

    You can break down the initial search query into words and then search all the words. Combine the results at the end.

    String searchQuery = 'Some Query With Multiple Words';
List<String> queryWords = searchQuery.split(' ');
List<Product> results = [];
for(String word in queryWords){
  final filterResult = filterByText(word);
  results.addAll(filterResult);
}

results = results.toSet().toList(); // to remove duplicates

    Please ensure you override the == for class Product.

    This might help you further: multiple word search in flutter

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