dash-dropdown-components

📦 dash_dropdown_components

Custom dropdown components for Plotly Dash similar to dcc.Dropdown, offering advanced functionality such as nested options and improved multi-select behavior.

📥 Installation

pip install dash-dropdown-components

Showcase

🧩 Components

🔽 Dropdown

A customizable dropdown component that enhances the standard Dash dropdown with additional features.

✅ Features

• Emulates dcc.Dropdown - Drop-in replacement for most use cases.
• Stays open on select – When multi=True, the dropdown stays open after selection (unlike dcc.Dropdown). You can override this with close_on_select=False.
• Smart multi→single behavior – When switching multi=True to multi=False dynamically, the first selected item is automatically preserved—no need for callbacks. – Clearable for multi=True and not clearable for multi=False by default, or control using clearable option.
• Multi-select support – Supports selecting multiple items.
• Searchable – Optionally enable a search term.

⚙️ Properties

Property	Type	Description
id	string	Unique component ID
options	list[dict,str]	List of options with label and value keys, or list with values
value	string or list	Selected value(s)
multi	bool	Enable multiple selections
searchable	bool	Enables search
clearable	bool	Whether or not the dropdown is "clearable", that is, whether or not a small "x" appears on the right of the dropdown that removes the selected value.
placeholder	string	Placeholder text when nothing is selected
disabled	bool	If True, this dropdown is disabled and the selection cannot be changed.
hide_options_on_select	bool	If True, options are removed when selected
style	bool	Whether dropdown closes on selection (default True)
className	string	Optional CSS class for styling

🌲 MultiLevelDropdown

A hierarchical dropdown component that supports nested options (multilevel structure), allowing for structured category selection.

✅ Features

• Nested options – Supports arbitrarily nested dropdowns.
• Expandable submenus – Submenus open and close interactively.
• Custom labels – Each level supports custom labeling and values.

⚙️ Properties

Property	Type	Description
id	string	Unique component ID
options	list[dict,str]	List of dicts of options with label, value and suboptions keys
value	string or list	Selected value(s)
multi	bool	Enable multiple selections
clearable	bool	Whether or not the dropdown is "clearable", that is, whether or not a small "x" appears on the right of the dropdown that removes the selected value.
placeholder	string	Placeholder text when nothing is selected
disabled	bool	If True, this dropdown is disabled and the selection cannot be changed.
hide_options_on_select	bool	If True, options are removed when selected
submenu_widths	list	Control the width of the submenu for each level. Can be in percentage if the preceding level or fixed widths
style	bool	Whether dropdown closes on selection (default True)
className	string	Optional CSS class for styling

💡 Usage Example

import dash_dropdown_components as ddc
from dash import Dash, callback, html, Input, Output, dcc

app = Dash(__name__)

options = [
    {'value': 'banana', 'label': 'Banana'},
    {'value': 'apple', 'label': 'Apple'},
    {'value': 'strawberry', 'label': 'Strawberry'},
    {'value': 'kiwi', 'label': 'Kiwi'},
    {'value': 'orange', 'label': 'Orange'},
    {'value': 'blueberry', 'label': 'Blueberry'},
    {'value': 'lemon', 'label': 'Lemon'},
    {'value': 'lime', 'label': 'Lime'},
    {'value': 'mandarin', 'label': 'Mandarin'},
]

multi_level_options = [
    {
        'label': 'Fruits',
        'value': 'fruits',
        'suboptions': [
            { 'label': 'Apple', 'value': 'apple' },
            { 'label': 'Banana', 'value': 'banana' },
            { 'label': 'Berries',
              'value': 'berries',
              'suboptions': [
                  { 'label': 'Strawberry', 'value': 'strawberry'},
                  { 'label': 'Blueberry', 'value': 'blueberry'}
                ]
            }
    ]},
    {
        'label': 'Vegetables',
        'value': 'vegetables',
        'suboptions': [
            {
            'label': 'Potato',
            'value': 'potato'
            },
            {
            'label': 'Carrot',
            'value': 'carrot'
            },
    ]}
]; 

app.layout = html.Div(
    [
html.Div([
        html.P('ddc.Dropdown'),
        dcc.RadioItems(id='ddc-dd-multi',
                       options=[{'label': 'Multi: True', 'value': True},
                                {'label': 'Multi: False', 'value': False}],
                       value=False),
        ddc.Dropdown(
            id='ddc-dd',
            options=options,
            value=options[0]['value'],
            multi=False,
            disabled=False,
            searchable=True,
            hide_options_on_select=True
        ),
        html.Div(id='ddc-dd-selection')
    ], style={'width': '25%', 'display': 'inline-block'}),
html.Div([
        html.P('ddc.MultiLevelDropdown'),
        dcc.RadioItems(id='ddc-mldd-multi',
                       options=[{'label': 'Multi: True', 'value': True},
                                {'label': 'Multi: False', 'value': False}],
                       value=False),
        ddc.MultiLevelDropdown(
            id='ddc-mldd',
            options=multi_level_options,
            value=['fruits', 'banana'],
            multi=False,
            disabled=False,
            hide_options_on_select=True,
            submenu_widths=['10vw', '20vw']
        ),
        html.Div(id='ddc-mldd-selection')
    ], style={'width': '25%', 'display': 'inline-block'}),
],
style={'display': 'flex', 'flexDirection': 'row'})


@callback(Output('ddc-dd-selection', 'children'),
          Input('ddc-dd', 'value'))
def display_output(value):
    return 'You have entered {}'.format(value)

@callback(Output('ddc-mldd-selection', 'children'),
          Input('ddc-mldd', 'value'))
def display_output(value):
    return 'You have entered {}'.format(value)

@callback(Output('ddc-dd', 'multi'),
          Input('ddc-dd-multi', 'value'))
def set_multi(multi):
    return multi

@callback(Output('ddc-mldd', 'multi'),
          Input('ddc-mldd-multi', 'value'))
def set_multi(multi):
    return multi


if __name__ == '__main__':
    app.run(debug=True)

📝 License

This project is licensed under the MIT License. See the LICENSE file for details.

🔗 Links

• GitHub Repository
• Dash Documentation