CODEWITHSUNDEEP
flutterdart
TB AS
TB AS

Reputation: 37

How to check if DropdownButton has a selected value?

How can I check if there is a selected ìtem in my DropdownButton before I press a Button and Toast a error message if no item is selected?

I have been searching for a solution but no hope yet. I am checking if all my TextField is empty, and that works. But haven't found any solution for the DropdownButton. The ElevatedButton saves the data to firebase.

Here is a snippet of my code:

child: DropdownButtonFormField(
            decoration: InputDecoration(
              border: OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.grey)
              ),

            ),
            items: _isAdmin
                .map((value) => DropdownMenuItem(
              child: Text(
                value,
                style: TextStyle(color: Colors.black),
              ),
              value: value,
            ))
                .toList(),
            onChanged: (selectedadmin){
              setState(() {
                isadmin = selectedadmin;

              });
            },
            value: isadmin,
            isExpanded: false,
            elevation: 10,

          ),
        ),


        ElevatedButton(
            onPressed: () async {
              var Name = nameController.text.trim();
              var email = emailController.text.trim();
              var password = passwordController.text.trim();
              var mobilenumber = mobileController.text.trim();
              var empid = employeidController.text.trim();



              if (Name.isEmpty ||
                  email.isEmpty ||
                  password.isEmpty ||
                  empid.isEmpty ||
                  mobilenumber.isEmpty) {
                // show error toast

Upvotes: 0

Views: 824

Answers (1)

Charger513
Charger513

Reputation: 143

Unlike TextFormField, DropdownButtonFormField doesn't have a controller. However you have the onChange method, where you are setting the isadmin variable. You should check the value of the isadmin var within the onPressed in your button.

Upvotes: 1

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