CODEWITHSUNDEEP
flutterdart
Nyoman Gunartha
Nyoman Gunartha

Reputation: 87

Flutter-create listview with multi textEditingController

I want to create multi input in list view with dynamic total item count . I use list of textcontroller but when I input a data all controller show with same value.

this my controller :

int totalItem = 15;

List<TextEditingController> _color = List.filled(15, TextEditingController());
List<TextEditingController> _brand = List.filled(15, TextEditingController());

implement at textfield :

         Padding(
          padding: const EdgeInsets.only(bottom: 10, left: 20, right: 20),
          child: TextFormField(
            controller: _color[index],
            decoration: InputDecoration(
              hintText: "Color",
              labelText: "Color",
            ),
          ),
        ),
        Padding(
          padding: const EdgeInsets.only(bottom: 10, left: 20, right: 20),
          child: TextFormField(
            controller: _brand[index],
            decoration: InputDecoration(
              hintText: "Brand",
              labelText: "Brand",
            ),
          ),
        ),

When run the app text controller show with same value. Please help me to solve this problem?

Complete code : https://github.com/gunartha/listview_with_multi_input

Thank you.

enter image description here

Upvotes: 2

Views: 3637

Answers (1)

fravolt
fravolt

Reputation: 3001

I think this happens because of the way the List.filled constructor works. In the documentation it mentions:

Creates a list of the given length with fill at each position.

Implying that fill (in this case your TextEditingController) is only initialized once, and a reference to this same controller is then put in each index. As a result, all color fields are controlled by (a reference to) the same Controller instance, and the same goes for brands.

To resolve this, you'll need to use a different way to initialize your list of controllers. A simple loop would suffice, but you may also be able to come up with a more elegant solution.

Here's some example code to initialize the lists in a loop in initState:

  List<TextEditingController> _color = [];
  List<TextEditingController> _brand = [];

  @override
  void initState() {
    for (int i = 0; i < totalItem; i++) {
      _color.add(TextEditingController());
      _brand.add(TextEditingController());
    }
    super.initState();
  }

Which works as expected on my machine.

Upvotes: 1

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