Value displayed in the hover label is incorrect

[felixveysseyre]

Hello,

I am working with PlotlyJS to display scientific data.

Some numbers in my traces are displayed using scientific notation. For example -9.57760792915282e-20. Here is an example of such a plot: CodePen.

Unfortunately, PlotlyJS seem to handle small number displaying weirdly:

As you can see the hover box is displaying -95.77608 in stead of -9.57760792915282e-20.

Thanks

[etpinard]

Thanks for report.

This one is a little weird. Under hovermode: 'closest' the hover labels look fine and then when returning to hovermode: 'x' the comparison hover labels look ok.

---

For devs, http://codepen.io/etpinard/pen/RpqPvP is a little easier to digest.

[claresloggett]

I just thought I'd add a comment to this as I was about to file a separate bug report, then realised that this may be the same issue. In short, my issue was that I was getting the wrong hover label, and the fix was to set hovermode="closest". As a naive user it just looked like a bug to me so I would suggest that maybe hovermode="closest" should be the default setting - it seems to me the intuitive behaviour.

Here's a code snippet that demonstrates what I thought at first was a "bug". I cannot get a tooltip for the B point in this dataset with the default hover mode, because the C tooltip comes up instead:

import pandas as pd
import io

from plotly.offline import download_plotlyjs, init_notebook_mode, plot, iplot
import plotly.graph_objs as go
init_notebook_mode()

df_str = """\
x y label
1 2 A
2 1 B
2 3 C"""

with io.StringIO(df_str) as f:
    df = pd.read_table(f, sep=" ")

scatter = go.Scatter(x = df['x'], y = df['y'], 
                     mode = 'markers',
                     marker = {'size':10}
                     text = df['label'])

layout = go.Layout(
    xaxis={'range': [0, 3]},
    yaxis={'range': [0, 4]},
)

fig = go.Figure(data=[scatter], layout=layout)
plot(fig)

[alexcjohnson]

This seems to have been fixed some time ago, as of v1.30.0 - perhaps #1932.