Question

这是我的代码，我想在用户输入按钮但遇到以下错误时将数据存储到Firebase数据库中

                       onTap: () {
                        if(_controllershopname.text==''||_controllerstreet.text==''||_controllershopnumber.text==''||_controllercity.text==''||_controllerstate.text=='')
                          {

                            Fluttertoast.showToast(msg: "Please Fill all the fields");
                          }else{
                          DatabaseReference databseRefrence = FirebaseDatabase.instance.reference().child("ShopKeeper");

                          databseRefrence.child(widget.number).push().set(
                            {
                              'Name':widget.userName,


                              'ShopName': _controllershopname.text,
                              'ShopNumber':_controllershopnumber.text,
                              'ShopStreet':_controllerstreet.text,
                              'ShopCity':_controllercity.text,
                              'ShopState':_controllerstate.text,
                              'OnlineDelivery':"Yes",
                            });

这是错误

E / flutter（26078）：[错误：flutter / lib / ui / ui_dart_state.cc（157）]未处理的异常：无效的参数：“ TextEditingController”的实例 E / flutter（26078）：＃0 StandardMessageCodec.writeValue（package：flutter / src / services / message_codecs.dart：392：7） E / Flutter（26078）：＃1 StandardMessageCodec.writeValue。（软件包：flutter / src / services / message_codecs.dart：389：9） E / Flutter（26078）：＃2 _LinkedHashMapMixin.forEach（dart：collection-patch / compact_hash.dart：379：8） E / flutter（26078）：＃3 StandardMessageCodec.writeValue（package：flutter / src / services / message_codecs.dart：387：13） E / Flutter（26078）：＃4 StandardMessageCodec.writeValue。（软件包：flutter / src / services / message_codecs.dart：389：9） E / flutter（26078）：＃5 _LinkedHashMapMixin.forEach（dart：collection-

Answer 1

您是否创建了“TextEdittingControllers”的实例？如果创建了，那么您应该在保存到数据库之前尝试修剪文本：

 onTap: () {
        if(_controllershopname.text==''||_controllerstreet.text==''||_controllershopnumber.text==''||_controllercity.text==''||_controllerstate.text=='')
          {
  
          {

            Fluttertoast.showToast(msg: "Please Fill all the fields");
          }else{
          DatabaseReference databseRefrence = FirebaseDatabase.instance.reference().child("ShopKeeper");

          databseRefrence.child(widget.number).push().set(
            {
              'Name':widget.userName,


              'ShopName': _controllershopname.text.trim(),
              'ShopNumber':_controllershopnumber.text.trim(),
              'ShopStreet':_controllerstreet.text.trim(),
              'ShopCity':_controllercity.text.trim(),
              'ShopState':_controllerstate.text.trim(),
              'OnlineDelivery':"Yes",
            });

未处理的异常：无效的参数：'TextEditingController'的实例

1 个答案: