问题DropdownSearch未显示在颤抖的网络中

Question

我尝试使用此[小工具] [1]：

当我使用基本列表时，就可以了：

List testList = ["test","test","test","test","test","test","test",];
    final test = DropdownSearch<String>(
        mode: Mode.MENU,
        showSelectedItem: true,
        items: ["Brazil", "Italia (Disabled)", "Tunisia", 'Canada'],
        label: "Menu mode",
        hint: "country in menu mode",
        popupItemDisabled: (String s) => s.startsWith('I'),
        onChanged: print,
        selectedItem: "Brazil");

但是当我想在我的模型客户端中使用列表时：

final test = DropdownSearch<Client>(
        mode: Mode.MENU,
        showSelectedItem: true,
        items: model.clients,
        label: "Menu mode",
        hint: "country in menu mode",
//        popupItemDisabled: (String s) => s.startsWith('I'),
        onChanged: print,
        onFind: model.getListClients(),
        selectedItem: model.clients[0]);

•model.clients：

这是我的api生成的客户端列表

未显示我的视图。我使用Flutter Web。所以为什么 ？

编辑2：

in my viewmodel:

  void load(BuildContext context, List args) async {
    this._context = context;
    setLifecycle(OnLoad());
    final getAllClients = Provider.of<GetAllClient>(context);
    this.clients = await getAllClients.call();
    final getAllEmployees = Provider.of<GetAllEmployee>(context, listen: false);
    this.employees = await getAllEmployees.call();
/*
    contributors = Contributor.getFirstContrib();
*/
    setLifecycle(OnLoaded());
    getListClients(context);
  }


  Future<List<Client>> getListClients(BuildContext context)async{
    print("length ${clients.length}");
    return clients;
  }

长度= 17，所以很好。

我认为：

final test = Padding(
      padding: EdgeInsets.only(top: 12.0, left: 12.0, bottom: 12.0),
      child: SizedBox(
        width: 300,
        child: DropdownSearch<Client>(
            mode: Mode.MENU,
            showSelectedItem: true,
            label: "Menu mode",
            hint: "country in menu mode",
//        popupItemDisabled: (String s) => s.startsWith('I'),
            onChanged: print,
            onFind: (text) => model.getListClients(context),
            selectedItem: model.clients[0]),
      ),
    );

但是我总是有这个错误：

未捕获的错误：断言失败：file：///Users/evanma/development/flutter/packages/flutter/lib/src/widgets/framework.dart：2611：20 _debugCurrentBuildTarget ==上下文 不正确

Answer 1

请用items替换onFind:元素，因为这是在获取数据异步时使用的元素。尝试类似的东西 onFind: getClients，其中