Flutter Dropdown OnChange Implementation

Flutter dropdown onChange implementation. In this post, I will be implementing Flutter dropdown onChange with a proper Flutter code example. I will be explaining everything about Flutter dropdown onChange step by step so you don’t have any queries left when you finish reading this post. So let’s not waste anymore time and start implementing Flutter dropdown onChange in Flutter dropdown button.

What is Flutter Dropdown OnChange?

Flutter dropdown onChange is used to select an option from the list of dropdown items and show it in the Flutter dropdown button. Don’t worry in the next section, I will implement Flutter dropdown onChange using an easy Flutter example so you can have a better idea.

Implementing Flutter Dropdown OnChange(All Steps)

To implement Flutter dropdown onChange, we have to use the on changed constructor of the Flutter dropdown button widget. See the below code:

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Step 1

DropdownMenuItem(
                 value: 'Sports',
                    child: Text('Sports',
                        style: TextStyle(fontSize: 15, color: Colors.black45))),

The value constructor of the drop down menu item is like an id of that item. This is the value that is being fetched when we select any item from the dropdown list.

Step 2

String? categoryValue;

In step 1, we have to define a string variable so we can store the value of selected item in it.

Step 3 Continue reading…