Programming Tutorials

Flutter - DropdownButton Height The DropdownButton class represents a material design button for selecting from a list of items. The DropdownButton allows the user to select from a number of items. The DropdownButton shows the currently selected item as well as an arrow that opens a menu for selecting another item. The DropdownButton’s all entries in a menu must represent values with consistent types. Commonly, the flutter developers use an enum. The DropdownButton class’s onChanged callback should update a state variable that defines the dropdown's value. When the flutter developers set the onChanged callback to null or the list of items to null then the dropdown button will be disabled. The following flutter app development tutorial will demonstrate how to set or change the height of a DropdownButton widget. But there is no built-in property or method in DropdownButton class to set or change its height. There is a simple trick, flutter developers can ...

Flutter - DropdownButton Border The DropdownButton class represents a material design button for selecting from a list of items. The DropdownButton allows the user to select from a number of items. The DropdownButton shows the currently selected item as well as an arrow that opens a menu for selecting another item. The DropdownButton’s all entries in a menu must represent values with consistent types. Commonly, the flutter developers use an enum. The DropdownButton class’s onChanged callback should update a state variable that defines the dropdown's value. When the flutter developers set the onChanged callback to null or the list of items to null then the dropdown button will be disabled. The following flutter app development tutorial will demonstrate how to add a border to a DropdownButton widget. Here we will add a rounded corners border around the DropdownButton widget. But there is no built-in property or method in DropdownButton class to add a bord...

Flutter - DropdownButton Width The DropdownButton class represents a material design button for selecting from a list of items. The DropdownButton allows the user to select from a number of items. The DropdownButton shows the currently selected item as well as an arrow that opens a menu for selecting another item. The DropdownButton’s all entries in a menu must represent values with consistent types. Commonly, the flutter developers use an enum. The DropdownButton class’s onChanged callback should update a state variable that defines the dropdown's value. When the flutter developers set the onChanged callback to null or the list of items to null then the dropdown button will be disabled. The following flutter app development tutorial will demonstrate how to set or change the width of a DropdownButton widget. But there is no built-in property or method in DropdownButton class to set or change the width of the DropdownButton widget itself and its child it...

Flutter - DropdownButton Remove Underline The DropdownButton class represents a material design button for selecting from a list of items. The DropdownButton allows the user to select from a number of items. The DropdownButton shows the currently selected item as well as an arrow that opens a menu for selecting another item. The DropdownButton’s all entries in a menu must represent values with consistent types. Commonly, the flutter developers use an enum. The DropdownButton class’s onChanged callback should update a state variable that defines the dropdown's value. When the flutter developers set the onChanged callback to null or the list of items to null then the dropdown button will be disabled. The following flutter app development tutorial will demonstrate how to remove the underline from a DropdownButton widget. Here we will use the DropdownButton class’s underline property to hide/remove the underline of the DropdownButton widget. The Dropdown...

Flutter DropdownButton The DropdownButton class represents a material design button for selecting from a list of items. The dropdown button allows the user to select from a number of items. The DropdownButton shows the currently selected item as well as an arrow that opens a menu for selecting another item. The DropdownButton’s all entries in a menu must represent values with consistent types. Commonly, the flutter developers use an enum. Each DropdownMenuItem in items must be specialized with that same type of argument. The DropdownButton class’s onChanged callback should update a state variable that defines the dropdown's value. This callback should also call State.setState to rebuild the dropdown menu with the new value. When the flutter developers set the onChanged callback to null or the list of items to null then the dropdown button will be disabled. In a disabled DropdownButton its arrow will be displayed in grey and it will not respond to ...