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NoUpdate is a Valid Prop #3127

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Merged
merged 4 commits into from
Jul 7, 2025
Merged

NoUpdate is a Valid Prop #3127

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8919edf
is a Valid Prop
2Ryan09 Jan 21, 2025
b99ff5f
remove prints
2Ryan09 Jan 21, 2025
8ec605c
remove test.py
2Ryan09 Jan 21, 2025
5f12f0b
Merge branch 'dev' into no-update-is-valid-prop
T4rk1n Jul 7, 2025
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12 changes: 1 addition & 11 deletions dash/_callback.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@
from . import _validate
from .background_callback.managers import BaseBackgroundCallbackManager
from ._callback_context import context_value
from ._no_update import NoUpdate


async def _async_invoke_callback(
Expand All @@ -58,17 +59,6 @@ def _invoke_callback(func, *args, **kwargs): # used to mark the frame for the d
return func(*args, **kwargs) # %% callback invoked %%


class NoUpdate:
def to_plotly_json(self): # pylint: disable=no-self-use
return {"_dash_no_update": "_dash_no_update"}

@staticmethod
def is_no_update(obj):
return isinstance(obj, NoUpdate) or (
isinstance(obj, dict) and obj == {"_dash_no_update": "_dash_no_update"}
)


GLOBAL_CALLBACK_LIST = []
GLOBAL_CALLBACK_MAP = {}
GLOBAL_INLINE_SCRIPTS = []
Expand Down
9 changes: 9 additions & 0 deletions dash/_no_update.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
class NoUpdate:
def to_plotly_json(self): # pylint: disable=no-self-use
return {"_dash_no_update": "_dash_no_update"}

@staticmethod
def is_no_update(obj):
return isinstance(obj, NoUpdate) or (
isinstance(obj, dict) and obj == {"_dash_no_update": "_dash_no_update"}
)
5 changes: 3 additions & 2 deletions dash/_validate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
import flask

from ._grouping import grouping_len, map_grouping
from ._no_update import NoUpdate
from .development.base_component import Component
from . import exceptions
from ._utils import (
Expand Down Expand Up @@ -211,8 +212,8 @@ def validate_multi_return(output_lists, output_values, callback_id):


def fail_callback_output(output_value, output):
valid_children = (str, int, float, type(None), Component)
valid_props = (str, int, float, type(None), tuple, MutableSequence)
valid_children = (str, int, float, type(None), Component, NoUpdate)
valid_props = (str, int, float, type(None), tuple, MutableSequence, NoUpdate)

def _raise_invalid(bad_val, outer_val, path, index=None, toplevel=False):
bad_type = type(bad_val).__name__
Expand Down