361 lines
12 KiB
Python
361 lines
12 KiB
Python
# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2024)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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from dataclasses import dataclass
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from textwrap import dedent
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from typing import TYPE_CHECKING, Any, Callable, Generic, Sequence, cast, overload
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from streamlit.dataframe_util import OptionSequence, convert_anything_to_list
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from streamlit.elements.lib.form_utils import current_form_id
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from streamlit.elements.lib.options_selector_utils import index_, maybe_coerce_enum
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from streamlit.elements.lib.policies import (
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check_widget_policies,
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maybe_raise_label_warnings,
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)
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from streamlit.elements.lib.utils import (
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Key,
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LabelVisibility,
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compute_and_register_element_id,
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get_label_visibility_proto_value,
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save_for_app_testing,
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to_key,
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)
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from streamlit.errors import StreamlitAPIException
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from streamlit.proto.Selectbox_pb2 import Selectbox as SelectboxProto
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from streamlit.runtime.metrics_util import gather_metrics
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from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
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from streamlit.runtime.state import (
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WidgetArgs,
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WidgetCallback,
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WidgetKwargs,
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get_session_state,
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register_widget,
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)
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from streamlit.type_util import (
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T,
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check_python_comparable,
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)
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if TYPE_CHECKING:
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from streamlit.delta_generator import DeltaGenerator
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@dataclass
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class SelectboxSerde(Generic[T]):
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options: Sequence[T]
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index: int | None
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def serialize(self, v: object) -> int | None:
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if v is None:
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return None
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if len(self.options) == 0:
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return 0
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return index_(self.options, v)
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def deserialize(
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self,
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ui_value: int | None,
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widget_id: str = "",
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) -> T | None:
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idx = ui_value if ui_value is not None else self.index
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return self.options[idx] if idx is not None and len(self.options) > 0 else None
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class SelectboxMixin:
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@overload
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def selectbox(
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self,
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label: str,
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options: OptionSequence[T],
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index: int = 0,
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format_func: Callable[[Any], Any] = str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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placeholder: str = "Choose an option",
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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) -> T: ...
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@overload
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def selectbox(
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self,
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label: str,
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options: OptionSequence[T],
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index: None,
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format_func: Callable[[Any], Any] = str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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placeholder: str = "Choose an option",
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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) -> T | None: ...
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@gather_metrics("selectbox")
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def selectbox(
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self,
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label: str,
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options: OptionSequence[T],
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index: int | None = 0,
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format_func: Callable[[Any], Any] = str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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placeholder: str = "Choose an option",
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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) -> T | None:
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r"""Display a select widget.
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Parameters
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----------
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label : str
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A short label explaining to the user what this select widget is for.
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The label can optionally contain GitHub-flavored Markdown of the
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following types: Bold, Italics, Strikethroughs, Inline Code, Links,
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and Images. Images display like icons, with a max height equal to
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the font height.
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Unsupported Markdown elements are unwrapped so only their children
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(text contents) render. Display unsupported elements as literal
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characters by backslash-escaping them. E.g.,
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``"1\. Not an ordered list"``.
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See the ``body`` parameter of |st.markdown|_ for additional,
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supported Markdown directives.
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For accessibility reasons, you should never set an empty label, but
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you can hide it with ``label_visibility`` if needed. In the future,
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we may disallow empty labels by raising an exception.
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.. |st.markdown| replace:: ``st.markdown``
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.. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown
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options : Iterable
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Labels for the select options in an ``Iterable``. This can be a
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``list``, ``set``, or anything supported by ``st.dataframe``. If
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``options`` is dataframe-like, the first column will be used. Each
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label will be cast to ``str`` internally by default.
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index : int
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The index of the preselected option on first render. If ``None``,
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will initialize empty and return ``None`` until the user selects an option.
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Defaults to 0 (the first option).
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format_func : function
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Function to modify the display of the options. It receives
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the raw option as an argument and should output the label to be
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shown for that option. This has no impact on the return value of
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the command.
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key : str or int
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An optional string or integer to use as the unique key for the widget.
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If this is omitted, a key will be generated for the widget
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based on its content. No two widgets may have the same key.
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help : str
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An optional tooltip that gets displayed next to the widget label.
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Streamlit only displays the tooltip when
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``label_visibility="visible"``.
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on_change : callable
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An optional callback invoked when this selectbox's value changes.
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args : tuple
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An optional tuple of args to pass to the callback.
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kwargs : dict
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An optional dict of kwargs to pass to the callback.
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placeholder : str
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A string to display when no options are selected.
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Defaults to "Choose an option".
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disabled : bool
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An optional boolean that disables the selectbox if set to ``True``.
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The default is ``False``.
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label_visibility : "visible", "hidden", or "collapsed"
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The visibility of the label. The default is ``"visible"``. If this
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is ``"hidden"``, Streamlit displays an empty spacer instead of the
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label, which can help keep the widget alligned with other widgets.
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If this is ``"collapsed"``, Streamlit displays no label or spacer.
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Returns
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-------
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any
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The selected option or ``None`` if no option is selected.
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Example
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-------
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>>> import streamlit as st
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>>>
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>>> option = st.selectbox(
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... "How would you like to be contacted?",
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... ("Email", "Home phone", "Mobile phone"),
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... )
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>>>
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>>> st.write("You selected:", option)
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.. output::
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https://doc-selectbox.streamlit.app/
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height: 320px
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To initialize an empty selectbox, use ``None`` as the index value:
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>>> import streamlit as st
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>>>
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>>> option = st.selectbox(
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... "How would you like to be contacted?",
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... ("Email", "Home phone", "Mobile phone"),
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... index=None,
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... placeholder="Select contact method...",
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... )
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>>>
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>>> st.write("You selected:", option)
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.. output::
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https://doc-selectbox-empty.streamlit.app/
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height: 320px
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"""
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ctx = get_script_run_ctx()
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return self._selectbox(
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label=label,
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options=options,
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index=index,
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format_func=format_func,
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key=key,
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help=help,
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on_change=on_change,
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args=args,
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kwargs=kwargs,
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placeholder=placeholder,
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disabled=disabled,
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label_visibility=label_visibility,
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ctx=ctx,
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)
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def _selectbox(
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self,
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label: str,
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options: OptionSequence[T],
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index: int | None = 0,
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format_func: Callable[[Any], Any] = str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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placeholder: str = "Choose an option",
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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ctx: ScriptRunContext | None = None,
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) -> T | None:
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key = to_key(key)
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check_widget_policies(
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self.dg,
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key,
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on_change,
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default_value=None if index == 0 else index,
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)
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maybe_raise_label_warnings(label, label_visibility)
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opt = convert_anything_to_list(options)
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check_python_comparable(opt)
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element_id = compute_and_register_element_id(
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"selectbox",
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user_key=key,
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form_id=current_form_id(self.dg),
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label=label,
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options=[str(format_func(option)) for option in opt],
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index=index,
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help=help,
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placeholder=placeholder,
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)
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if not isinstance(index, int) and index is not None:
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raise StreamlitAPIException(
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"Selectbox Value has invalid type: %s" % type(index).__name__
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)
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if index is not None and len(opt) > 0 and not 0 <= index < len(opt):
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raise StreamlitAPIException(
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"Selectbox index must be greater than or equal to 0 and less than the length of options."
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)
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session_state = get_session_state().filtered_state
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if key is not None and key in session_state and session_state[key] is None:
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index = None
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selectbox_proto = SelectboxProto()
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selectbox_proto.id = element_id
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selectbox_proto.label = label
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if index is not None:
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selectbox_proto.default = index
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selectbox_proto.options[:] = [str(format_func(option)) for option in opt]
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selectbox_proto.form_id = current_form_id(self.dg)
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selectbox_proto.placeholder = placeholder
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selectbox_proto.disabled = disabled
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selectbox_proto.label_visibility.value = get_label_visibility_proto_value(
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label_visibility
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)
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if help is not None:
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selectbox_proto.help = dedent(help)
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serde = SelectboxSerde(opt, index)
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widget_state = register_widget(
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selectbox_proto.id,
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on_change_handler=on_change,
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args=args,
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kwargs=kwargs,
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deserializer=serde.deserialize,
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serializer=serde.serialize,
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ctx=ctx,
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value_type="int_value",
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)
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widget_state = maybe_coerce_enum(widget_state, options, opt)
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if widget_state.value_changed:
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serialized_value = serde.serialize(widget_state.value)
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if serialized_value is not None:
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selectbox_proto.value = serialized_value
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selectbox_proto.set_value = True
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if ctx:
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save_for_app_testing(ctx, element_id, format_func)
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self.dg._enqueue("selectbox", selectbox_proto)
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return widget_state.value
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@property
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def dg(self) -> DeltaGenerator:
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"""Get our DeltaGenerator."""
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return cast("DeltaGenerator", self)
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