Why when using fig.update_traces(xaxis='x1') doesn't print axis tick and labels bellow second subplot?

Dash Python
1

Why when using “fig.update_traces(xaxis=‘x1’)” it doesn’t print axis tick and labels bellow second subplot?
This code is used to extended line hover to all subplots.
If I comment this line, then it normally plots axis tick and labels bellow second subplot. See penultimate line.

import yfinance as yf
import plotly.graph_objects as go
from plotly.subplots import make_subplots

ticker = “AAPL”
df = yf.download(ticker, start=“2021-01-01”)
fig = make_subplots(rows=2, cols=1, shared_xaxes=True, vertical_spacing=0.05, row_heights=[0.7, 0.3])
fig.add_trace(go.Candlestick(x=df.index,
open=df[‘Open’],
high=df[‘High’],
low=df[‘Low’],
close=df[‘Close’],
name = ticker,
), row=1, col=1)
colors = [‘green’ if (row[‘Close’] - row[‘Open’]) >= 0
else ‘red’ for index, row in df.iterrows()]
fig.add_trace(go.Bar( x=df.index,
y=df[‘Volume’],
marker_color=colors,
name = ‘Volume’,
hovertemplate = “Volume: %{y:,.0f}”,
), row=2, col=1)
fig.update_layout(
xaxis_rangeslider_visible=False,
hovermode=‘x unified’,
xaxis2=dict(
tickformat = ‘%d/%m/%Y’, # this controls the format of the x-value in the hover box
ticks = “outside”,
type = “date”,
tickmode = “auto”,
),
)

spike line hover extended to all subplots

fig.update_traces(xaxis=‘x1’)
fig.show()

2

I get exactly the same issue in plotly v6.0.0.

Minimal working example:

import plotly.graph_objects as go
from plotly import data
from plotly.subplots import make_subplots

df = data.stocks()

fig = make_subplots(rows=2, cols=1, shared_xaxes=True)

fig.add_trace(go.Scatter(x=df["date"], y=df["AAPL"], name="A"), row=1, col=1)
fig.add_trace(go.Scatter(x=df["date"], y=df["GOOG"], name="B"), row=2, col=1)

fig.update_layout(hovermode="x unified")  # allow hover (step 1)
fig.update_traces(xaxis="x1")  # allow hover (step 2)
fig.for_each_xaxis(lambda x: x.update(showticklabels=True))  # tick labels are broken

fig.show()

Results:

image
image516×346 9.24 KB

Attempts at resolving the issue by manually defining a grid in fig.update_layout (e.g.
this thread) does not work.

A workaround is to simply set fig.update_traces(xaxis="x2"), or whatever the last row is, but that is a poor solution for very long charts with many subplots, where it is impossible to see the tick labels of the bottom-most plot. It will also not work for subplots with multiple columns.