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2 changes: 1 addition & 1 deletion shiny/types.py
Original file line number Diff line number Diff line change
Expand Up @@ -209,7 +209,7 @@ def resolve(
"""
...

def get_value(self) -> Optional[str]:
def get_value(self) -> str | None:
"""
Get the value of this navigation item (if any).

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9 changes: 6 additions & 3 deletions shiny/ui/_navs.py
Original file line number Diff line number Diff line change
Expand Up @@ -91,11 +91,14 @@ def resolve(

return nav, content

def get_value(self) -> str | HTML | None:
def get_value(self) -> str | None:
if self.content is None:
return None
a_tag = cast(Tag, self.nav.children[0])
return a_tag.attrs.get("data-value", None)
data_value_attr = a_tag.attrs.get("data-value", None)
if isinstance(data_value_attr, HTML):
data_value_attr = str(data_value_attr)
return data_value_attr

def tagify(self) -> None:
raise NotImplementedError(
Expand Down Expand Up @@ -279,7 +282,7 @@ def resolve(
content.children,
)

def get_value(self) -> Optional[str]:
def get_value(self) -> str | None:
for x in self.nav_controls:
val = x.get_value()
if val:
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