The DropDownButton is a widget that we can use to select one unique value or multivalue from a set of values. icon: to show a drop icon next to the button. value: A selected value from the drop-down will be shown in the drop-down button. Just use DropdownButton() widget we will use value, icon, onChanged and items poroperty of DropdownButton() widget. import 'dart:math' as math Ĭonst Duration _kDropdownMenuDuration = Duration(milliseconds: 300) Ĭonst EdgeInsets _kMenuItemPadding = EdgeInsets.symmetric(horizontal: 16.0) Ĭonst EdgeInsetsGeometry _kAlignedButtonPadding =ĮdgeInsetsDirectional.only(start: 16.0, end: 4.0) Ĭonst EdgeInsets _kUnalignedButtonPadding = EdgeInsets.zero Ĭonst EdgeInsets _kAlignedMenuMargin = EdgeInsets.zero Ĭonst EdgeInsetsGeometry _kUnalignedMenuMargin =ĮdgeInsetsDirectional.only(start: 16.0, end: 24. Flutter DropdownTextfield A DropdownTextfield is a material design TextField. Now we are set to make our DropdownButton. List> buildDropdownMenuItems(List companies) '),Ĭreate Custom Class For DropdownButton and write below code. _selectedCompany = _dropdownMenuItems.value To change the dropdown text, we need to set the value property. However, the dropdown still shows an empty string on it because the value property is not set. The standard drop down menu can be designed pretty well. You said that you would like to style your drop down yourself, I suspect that this is the reason why you decided against the standard. Option 2: Use CustomDropDown widget in which DropDownItems will always open below the DropdownButton. Because it is very robust, easy to write and has been tried and tested. _dropdownMenuItems = buildDropdownMenuItems(_companies) The selected item is null at first but its text changes when selecting an item from the dropdown menu. Option 1: Set DropDown.dart selectedItemOffset to -40 in then DropDownItems will always opens below the DropdownButton. List _companies = Company.getCompanies() Right now its open over Button widget and when I select last item and re-open as down side.Ĭode: import 'package:flutter/material.dart' įinal String title = "DropDown createState() => DropDownState() With the form field variant, you can use the OutlineInputBorder InputBorder, used normally for input text fields: DropdownButtonFormField(. For example, you have a form with city selection. Padding: EdgeInsets.I want to open DropDown dialog below DropdownButton like Spinner in Flutter. Dropdown option data in flutter from json api - Stack Overflow. How to Style Dropdown Button: DecoratedBox(Ĭolor:Colors.lightBlue, //background color of dropdown buttonīorder: Border.all(color: Colors.black38, width:3), //border of dropdown buttonīorderRadius: BorderRadius.circular(20), //border raiuds of dropdown button Usage In the pubspec. in fact FormBuilderSearchableDropdown is a widget of flutterformbuilder package and it depend on dropdownsearch. This widget extend TextField and has a similar behavior as TextFormField. The Form allows one to save, reset, or validate multiple fields at once. This is a convenience widget that wraps a DropdownButton widget in a FormField. Such as its background color, border secular etc. description DropdownButtonFormField class A FormField that contains a DropdownButton.You may encounter errors while adding DropdownButton, see our previous post where we have solved different kinds of errors that occurred while adding DropdownButton. It shows a list of options in a dropdown menu. We use the Dropdown Button to display any Dropdown List item as we can change its style according to it.
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