Slider change chart data and chart title

📊 Plotly Python
3

Hi Jon,
This indeed helps. I’m trying to extend your example to include dynamically updating an annotation as well. The annotation initializes to the start value, but does not change as the slider is changed. Can you tell me where I’m going wrong here? I added code to the args in the slider build and reference the annotations in the layout.
Thanks for any help!
Bill

import plotly
import plotly.graph_objs as go
import numpy as np

Set initial slider/title index

start_index = 10

Build all traces with visible=False

data = [go.Scatter(
visible = False,
line=dict(color=’#00CED1’, width=6),
name = '𝜈 = '+str(step),
x = np.arange(0,10,0.01),
y = np.sin(step*np.arange(0,10,0.01)))
for step in np.arange(0,5,0.1)]

Make initial trace visible

data[start_index][‘visible’] = True

Build slider steps

steps = []
for i in range(len(data)):
step = dict(
# Update method allows us to update both trace and layout properties
method = ‘update’,
args = [
# Make the ith trace visible
{‘visible’: [t == i for t in range(len(data))]},

        # Set the title for the ith trace
        {'title.text': 'Step %d' % i},
        {'annotations.text' : 'External %d' % i}
        
        ],
)
steps.append(step)

Build sliders

sliders = [go.layout.Slider(
active = 10,
currentvalue = {“prefix”: "Frequency: "},
pad = {“t”: 50},
steps = steps
)]

layout = go.Layout(
sliders=sliders,
title={‘text’: ‘Step %d’ % start_index},
annotations=[dict(
x=0,
y=0,
text = ‘External %d’ % start_index,
)]
)
fig = go.Figure(data=data, layout=layout)

plotly.offline.plot(fig, filename=‘test.html’)

Showing baseline in plot with slider changing the chart data and title