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Dropdown

A material design button for selecting from a list of items.

A dropdown lets the user select from a number of items. The dropdown shows the currently selected item as well as an arrow that opens a menu for selecting another item.

Examples​

Live example

Basic dropdown​

import flet as ft

def main(page: ft.Page):
    def button_clicked(e):
        t.value = f"Dropdown value is:  {dd.value}"
        page.update()

    t = ft.Text()
    b = ft.ElevatedButton(text="Submit", on_click=button_clicked)
    dd = ft.Dropdown(
        width=100,
        options=[
            ft.dropdown.Option("Red"),
            ft.dropdown.Option("Green"),
            ft.dropdown.Option("Blue"),
        ],
    )
    page.add(dd, b, t)

ft.app(main)
import flet as ft

def main(page: ft.Page):
    page.add(
        ft.Dropdown(
            label="Color",
            hint_text="Choose your favourite color?",
            options=[
                ft.dropdown.Option("Red"),
                ft.dropdown.Option("Green"),
                ft.dropdown.Option("Blue"),
            ],
            autofocus=True,
        )
    )

ft.app(main)
import flet as ft

def main(page: ft.Page):
    def dropdown_changed(e):
        t.value = f"Dropdown changed to {dd.value}"
        page.update()

    t = ft.Text()
    dd = ft.Dropdown(
        on_change=dropdown_changed,
        options=[
            ft.dropdown.Option("Red"),
            ft.dropdown.Option("Green"),
            ft.dropdown.Option("Blue"),
        ],
        width=200,
    )
    page.add(dd, t)

ft.app(main)

Change items in dropdown options​

import flet as ft

def main(page: ft.Page):
    def find_option(option_name):
        for option in d.options:
            if option_name == option.key:
                return option
        return None

    def add_clicked(e):
        d.options.append(ft.dropdown.Option(option_textbox.value))
        d.value = option_textbox.value
        option_textbox.value = ""
        page.update()

    def delete_clicked(e):
        option = find_option(d.value)
        if option != None:
            d.options.remove(option)
            # d.value = None
            page.update()

    d = ft.Dropdown()
    option_textbox = ft.TextField(hint_text="Enter item name")
    add = ft.ElevatedButton("Add", on_click=add_clicked)
    delete = ft.OutlinedButton("Delete selected", on_click=delete_clicked)
    page.add(d, ft.Row(controls=[option_textbox, add, delete]))

ft.app(main)

alignment​

Defines how the hint or the selected item is positioned within this dropdown.

Alignment is an instance of Alignment class.

autofocus​

True if the control will be selected as the initial focus. If there is more than one control on a page with autofocus set, then the first one added to the page will get focus.

bgcolor​

The background color of both the dropdown button and it's menu.

To set a different background color for the dropdown button, use fill_color or focused_bgcolor properties.

border​

Border around input.

Value is of type InputBorder and defaults to InputBorder.OUTLINE.

border_color​

Border color. Could be transparent to hide the border.

border_radius​

Border radius is an instance of BorderRadius class.

border_width​

The width of the border in virtual pixels. Set to 0 to completely remove border.

Defaults to 1.

color​

Text color.

content_padding​

The padding for the input decoration's container.

counter​

A Control to place below the line as a character count.

If None or an empty string and counter_text isn't specified, then nothing will appear in the counter's location.

counter_style​

The TextStyle to use for counter_text.

counter_text​

Optional text to place below the line as a character count.

If None or an empty string and counter isn't specified, then nothing will appear in the counter's location. If counter is specified and visible, then this counter_text will be ignored.

dense​

Whether the TextField is part of a dense form (ie, uses less vertical space).

disabled_hint_content​

A placeholder Control for the dropdown's value that is displayed when value is None and the dropdown is disabled.

elevation​

The dropdown's elevation.

Defaults to 8.

enable_feedback​

Whether detected gestures should provide acoustic and/or haptic feedback. On Android, for example, setting this to True produce a click sound and a long-press will produce a short vibration.

Defaults to True.

error_style​

The TextStyle to use for error_text.

error_text​

Text that appears below the input border.

If non-null, the border's color animates to red and the helper_text is not shown.

filled​

If True the decoration's container is filled with theme fill_color.

If filled=None(default), then it is implicitly set to True when at least one of the following is not None: fill_color, focused_bgcolor and bgcolor.

fill_color​

Background color of the dropdown button. Will not be visible if filled=False.

focused_bgcolor​

Background color of dropdown in focused state. Will not be visible if filled=False.

focused_border_color​

Border color in focused state.

focused_border_width​

Border width in focused state.

focused_color​

Text color when Dropdown is focused.

helper_style​

The TextStyle to use for helper_text.

helper_text​

Text that provides context about the input's value, such as how the value will be used.

If non-null, the text is displayed below the input decorator, in the same location as error_text. If a non-null error_text value is specified then the helper text is not shown.

hint_content​

A placeholder Control for the dropdown's value that is displayed when value is None.

hint_style​

The TextStyle to use for hint_text.

hint_text​

Text that suggests what sort of input the field accepts.

Displayed on top of the input when it's empty and either (a) label is null or (b) the input has the focus.

icon​

The name of the icon to show before the input field and outside of the decoration's container.

Value is of type Padding or a number.

icon_content​

The control to use for the drop-down button's icon. Defaults to an Icon(icons.ARROW_DROP_DOWN).

icon_enabled_color​

The color of any Icon descendant of icon_content if this button is enabled.

icon_disabled_color​

The color of any Icon descendant of icon_content if this button is disabled.

icon_size​

The size of the icon button which wraps icon_content.

Defaults to 24.0.

item_height​

The height of the items/options in the dropdown menu.

label​

Optional text that describes the input field.

When the input field is empty and unfocused, the label is displayed on top of the input field (i.e., at the same location on the screen where text may be entered in the input field). When the input field receives focus (or if the field is non-empty) the label moves above, either vertically adjacent to, or to the center of the input field.

label_style​

The TextStyle to use for label.

max_menu_height​

The maximum height of the dropdown menu.

options​

A list of Option controls representing items in this dropdown.

options_fill_horizontally​

Whether the dropdown's inner contents to horizontally fill its parent. By default this button's inner width is the minimum size of its content.

If True, the inner width is expanded to fill its surrounding container.

Value is of type bool and defaults to False.

padding​

The padding around the visible portion of this dropdown.

prefix​

Optional Control to place on the line before the input.

This can be used, for example, to add some padding to text that would otherwise be specified using prefix_text, or to add a custom control in front of the input. The control's baseline is lined up with the input baseline.

Only one of prefix and prefix_text can be specified.

The prefix appears after the prefix_icon, if both are specified.

prefix_icon​

An icon that appears before the prefix or prefix_text and before the editable part of the text field, within the decoration's container.

prefix_style​

The TextStyle to use for prefix_text.

prefix_text​

Optional text prefix to place on the line before the input.

suffix​

Optional Control to place on the line after the input.

This can be used, for example, to add some padding to the text that would otherwise be specified using suffix_text, or to add a custom control after the input. The control's baseline is lined up with the input baseline.

Only one of suffix and suffix_text can be specified.

The suffix appears before the suffix_icon, if both are specified.

suffix_icon​

An icon that appears after the editable part of the text field and after the suffix or suffix_text, within the decoration's container.

suffix_style​

The TextStyle to use for suffix_text.

suffix_text​

Optional text suffix to place on the line after the input.

text_size​

Text size in virtual pixels.

text_style​

The TextStyle to use for text in this dropdown button and the dropdown menu that appears when you tap the button.

value​

key value of the selected option.

focus()​

Moves focus to this dropdown.

on_blur​

Fires when the control has lost focus.

on_change​

Fires when the selected item of this dropdown has changed.

on_click​

Fires when this dropdown is clicked.

on_focus​

Fires when the control has received focus.

Option properties​

Represents an item in a dropdown. Either key or text must be specified, else an AssertionError will be raised.

alignment​

Defines the alignment of this option in it's container.

Value is of type Alignment and defaults to alignment.center_left.

content​

A Control to display in this option. If not specified, text will be used as fallback, else textwill be ignored.

key​

Option's key. If not specified text will be used as fallback.

text​

Option's display text. If not specified key will be used as fallback.

text_style​

Defines the style of the text.

Value is of type TextStyle.

Option Events​

on_click​

Fires when this option is clicked.