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This repository was archived by the owner on Aug 29, 2025. It is now read-only.
Conditional column alignment not applied to headers #947
Description
Using conditional alignment in columns works, but not for headers.
You can see that in your own documentation: https://dash.plotly.com/datatable/style#column-alignment.
from dash import Dash, dash_table
import pandas as pd
from collections import OrderedDict
data = OrderedDict(
[
("Date", ["2015-01-01", "2015-10-24", "2016-05-10", "2017-01-10", "2018-05-10", "2018-08-15"]),
("Region", ["Montreal", "Toronto", "New York City", "Miami", "San Francisco", "London"]),
("Temperature", [1, -20, 3.512, 4, 10423, -441.2]),
("Humidity", [10, 20, 30, 40, 50, 60]),
("Pressure", [2, 10924, 3912, -10, 3591.2, 15]),
]
)
df = pd.DataFrame(data)
app = Dash(__name__)
app.layout = dash_table.DataTable(
data=df.to_dict('records'),
columns=[{'id': c, 'name': c} for c in df.columns],
style_cell={'textAlign': 'left'},
style_cell_conditional=[
{
'if': {'column_id': 'Region'},
'textAlign': 'left'
}
]
)
if __name__ == '__main__':
app.run_server(debug=True)
According to the code and the text in your documentation:
In both cases, the column headers should have the same alignment as the cell content.
And yet, this is what I see in my Chrome browser:
Activity
[-]Conditional column alignment in headers not working[/-][+]Conditional column alignment not applied to headers[/+]