How to assign default value to DropdownButtonFormField in fltuter-CodePudding

I am trying to assign the default value to the DropdownButtonFormField in a flutter. I am trying to edit the record but I am not able to assign the default value to it.

I have workersList as a List.

 DropdownButtonFormField<String>(
                    value: workersList[0]['worker_name'],
                    decoration: const InputDecoration(
                      border: OutlineInputBorder(),
                      labelText: "Payment To",
                      prefixIcon: Icon(
                        Icons.phone_android,
                        color: Colors.blue,
                      ),
                    ),
                    validator: (value) {
                      if (value == null) {
                        return "Please Select Worker";
                      }
                      return null;
                    },
                    hint: const Text('Select Worker'),
                    items: workersList.map((Map value) {
                      return DropdownMenuItem<String>(
                        value: value['worker_id'].toString(),
                        child: Text(value['worker_name']),
                      );
                    }).toList(),
                    onChanged: (value) {
                      _workerController.text = value.toString();
                    },
                  ),

CodePudding user response：

Since you set the value property of the DropDownMenuItem to ['worker_id'], you need to set the initial value like:

DropdownButtonFormField<String>(
  value: workersList[0]['worker_id'],
  ...
)

CodePudding user response：

You have to use the same property that you used for DropDownMenuItem as a value, So just change the value

DropdownButtonFormField<String>(
  value: workersList[0]['worker_name'],
  ...
)

DropdownButtonFormField<String>(
  value: workersList[0]['worker_id'].toString(),
  ...
)