def _time_input(
self,
label: str,
value=None,
key: Optional[Key] = None,
help: Optional[str] = None,
on_change: Optional[WidgetCallback] = None,
args: Optional[WidgetArgs] = None,
kwargs: Optional[WidgetKwargs] = None,
*, # keyword-only arguments:
disabled: bool = False,
ctx: Optional[ScriptRunContext] = None,
) -> time:
key = to_key(key)
check_callback_rules(self.dg, on_change)
check_session_state_rules(default_value=value, key=key)
# Set value default.
if value is None:
value = datetime.now().time().replace(second=0, microsecond=0)
# Ensure that the value is either datetime/time
if not isinstance(value, datetime) and not isinstance(value, time):
raise StreamlitAPIException(
"The type of the value should be either datetime or time.")
# Convert datetime to time
if isinstance(value, datetime):
value = value.time().replace(second=0, microsecond=0)
time_input_proto = TimeInputProto()
time_input_proto.label = label
time_input_proto.default = time.strftime(value, "%H:%M")
time_input_proto.form_id = current_form_id(self.dg)
time_input_proto.disabled = disabled
if help is not None:
time_input_proto.help = dedent(help)
def deserialize_time_input(ui_value, widget_id=""):
return (datetime.strptime(ui_value, "%H:%M").time()
if ui_value is not None else value)
def serialize_time_input(v):
if isinstance(v, datetime):
v = v.time()
return time.strftime(v, "%H:%M")
current_value, set_frontend_value = register_widget(
"time_input",
time_input_proto,
user_key=key,
on_change_handler=on_change,
args=args,
kwargs=kwargs,
deserializer=deserialize_time_input,
serializer=serialize_time_input,
ctx=ctx,
)
if set_frontend_value:
time_input_proto.value = serialize_time_input(current_value)
time_input_proto.set_value = True
self.dg._enqueue("time_input", time_input_proto)
return cast(time, current_value)
def time_input(
self,
label: str,
value=None,
key: Optional[Key] = None,
help: Optional[str] = None,
on_change: Optional[WidgetCallback] = None,
args: Optional[WidgetArgs] = None,
kwargs: Optional[WidgetKwargs] = None,
) -> time:
"""Display a time input widget.
Parameters
----------
label : str
A short label explaining to the user what this time input is for.
value : datetime.time/datetime.datetime
The value of this widget when it first renders. This will be
cast to str internally. Defaults to the current time.
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 input.
on_change : callable
An optional callback invoked when this time_input'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.
Returns
-------
datetime.time
The current value of the time input widget.
Example
-------
>>> t = st.time_input('Set an alarm for', datetime.time(8, 45))
>>> st.write('Alarm is set for', t)
"""
key = to_key(key)
check_callback_rules(self.dg, on_change)
check_session_state_rules(default_value=value, key=key)
# Set value default.
if value is None:
value = datetime.now().time().replace(second=0, microsecond=0)
# Ensure that the value is either datetime/time
if not isinstance(value, datetime) and not isinstance(value, time):
raise StreamlitAPIException(
"The type of the value should be either datetime or time.")
# Convert datetime to time
if isinstance(value, datetime):
value = value.time().replace(second=0, microsecond=0)
time_input_proto = TimeInputProto()
time_input_proto.label = label
time_input_proto.default = time.strftime(value, "%H:%M")
time_input_proto.form_id = current_form_id(self.dg)
if help is not None:
time_input_proto.help = dedent(help)
def deserialize_time_input(ui_value, widget_id=""):
return (datetime.strptime(ui_value, "%H:%M").time()
if ui_value is not None else value)
def serialize_time_input(v):
if isinstance(v, datetime):
v = v.time()
return time.strftime(v, "%H:%M")
current_value, set_frontend_value = register_widget(
"time_input",
time_input_proto,
user_key=key,
on_change_handler=on_change,
args=args,
kwargs=kwargs,
deserializer=deserialize_time_input,
serializer=serialize_time_input,
)
if set_frontend_value:
time_input_proto.value = serialize_time_input(current_value)
time_input_proto.set_value = True
self.dg._enqueue("time_input", time_input_proto)
return cast(time, current_value)