Display a slider widget to select items from a list.

This also allows you to render a range slider by passing a two-element tuple or list as the value.

The difference between st.select_slider and st.slider is that select_slider accepts any datatype and takes an iterable set of options, while slider only accepts numerical or date/time data and takes a range as input.

Function signature

st.select_slider(label, options=(), value=None, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, label_visibility="visible")

Parameters

label (str)

A short label explaining to the user what this slider is for. For accessibility reasons, you should never set an empty label (label="") but hide it with label_visibility if needed. In the future, we may disallow empty labels by raising an exception.

options (Sequence, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index)

Labels for the slider options. All options will be cast to str internally by default. For pandas.DataFrame, the first column is selected.

value (a supported type or a tuple/list of supported types or None)

The value of the slider when it first renders. If a tuple/list of two values is passed here, then a range slider with those lower and upper bounds is rendered. For example, if set to (1, 10) the slider will have a selectable range between 1 and 10. Defaults to first option.

format_func (function)

Function to modify the display of the labels from the options. argument. It receives the option as an argument and its output will be cast to str.

key (str or int)

An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key.

help (str)

An optional tooltip that gets displayed next to the select slider.

on_change (callable)

An optional callback invoked when this select_slider's value changes.

args (tuple)

An optional tuple of args to pass to the callback.

kwargs (dict)

An optional dict of kwargs to pass to the callback.

disabled (bool)

An optional boolean, which disables the select slider if set to True. The default is False. This argument can only be supplied by keyword.

label_visibility ("visible" or "hidden" or "collapsed")

The visibility of the label. If "hidden", the label doesn’t show but there is still empty space for it above the widget (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible". This argument can only be supplied by keyword.

Returns

(any value or tuple of any value)

The current value of the slider widget. The return type will match the data type of the value parameter.

Examples

color = st.select_slider(
    'Select a color of the rainbow',
    options=['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet'])
st.write('My favorite color is', color)

And here's an example of a range select slider:

start_color, end_color = st.select_slider(
    'Select a range of color wavelength',
    options=['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet'],
    value=('red', 'blue'))
st.write('You selected wavelengths between', start_color, 'and', end_color)
(view standalone Streamlit app)

Check out our video on how to use one of Streamlit's core functions, the select slider! 🎈

In the video below, we'll take it a step further and make a double-ended slider.

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