Flutter从Form中提取所有键值 [英] Flutter extract all key-values from Form

问题描述

我正在使用Flutter构建具有动态输入集的表单。
因此，我永远无法假设表单将包含多少个文本字段，因此，我无法手动为每个字段分配一个键以以后从其控制器中检索数据。

I am building a form using flutter, that has a dynamic set of input. Therefore, I can never assume how many text fields the form will have, and so I cannot manually assign a key to each field to later retrieve data from its controller.

如果我实例化一个 Form ，其中包含一些 TextFormField 如何简单地提取整个表单的键值数组，

If I instanciate a Form, that holds some TextFormField how can I simply extract an array of key values for the whole form, when pressing a button for example?

Form(
  key: _formKey,
  child: Column(
    children: [
       TextFormField(),
       TextFormField(),
       TextFormField(),
    ]
  )
)

推荐答案

即时生成TextField及其控制器

to generate TextFields and their controller on the fly

Map<int,TextEditingController> controllers = {};

        Form(
            key: _formKey,
            child: Column(children: [
              ...List.generate(length, (index) {
                var controller = controllers.putIfAbsent(
                    index, () => TextEditingController());
                return TextFormField(
                  controller: controller,
                );
              })
            ]));

您可以使用其索引访问给定地图中的所有控制器

you can access all the controllers in the given map with their index

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