Adds the watch argument to pn.bind

[MarcSkovMadsen]

Fixes #1999

[MarcSkovMadsen]

Manual Test Is below

I've tried the test without watch and with watch=False and it works as I would expect.

import numpy as np
import panel as pn
import pandas as pd
import plotly.graph_objects as go

pn.extension('plotly')

data = {}
for i in range(10):
    xo = 5 * np.random.rand()
    xf = 5 + 5 * np.random.rand()
    x = np.linspace(xo, xf, int(50 + 50*np.random.rand()))
    e = np.random.rand()
    y = x**(1+e) * np.cos(x) + 4*(np.random.rand(len(x)) - 0.5)
    data[i] = {
        'x': x.tolist(),
        'y': y.tolist()
    }

nlines = pn.widgets.IntSlider(name='Number of lines', value=2, start=1, end=9)
timeseries = pn.pane.Plotly()

def get_plot(nlines):
    print("get_plot", nlines)
    fig = go.Figure()
    for i in range(nlines):
        fig.add_trace(
            go.Scatter(x=data[i]['x'], y=data[i]['y'], mode='lines', name=f'line-{i}'))
    timeseries.object = fig
get_plot(nlines.value)
pn.bind(get_plot, nlines=nlines, watch=True)

pn.Row(nlines, timeseries).servable()

[codecov]

Codecov Report

Merging #2000 (3c5bf32) into master (3dc12d2) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2000      +/-   ##
==========================================
- Coverage   84.66%   84.51%   -0.16%     
==========================================
  Files         163      175      +12     
  Lines       19729    20415     +686     
==========================================
+ Hits        16704    17253     +549     
- Misses       3025     3162     +137     

Impacted Files	Coverage Δ
panel/depends.py	83.33% <100.00%> (ø)
panel/compiler.py	7.52% <0.00%> (-2.48%)	⬇️
panel/param.py	89.07% <0.00%> (-2.43%)	⬇️
panel/io/reload.py	65.88% <0.00%> (-2.36%)	⬇️
panel/widgets/button.py	81.48% <0.00%> (-2.31%)	⬇️
panel/io/model.py	60.97% <0.00%> (-0.93%)	⬇️
panel/pane/vtk/synchronizable_serializer.py	79.93% <0.00%> (-0.91%)	⬇️
panel/pane/holoviews.py	79.64% <0.00%> (-0.57%)	⬇️
panel/widgets/input.py	95.83% <0.00%> (-0.04%)	⬇️
panel/pane/vtk/vtk.py	96.39% <0.00%> (-0.03%)	⬇️
... and 42 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3dc12d2...3c5bf32. Read the comment docs.

[philippjfr]

Looks good, thanks!

[MarcSkovMadsen]

Thanks. Great to get it in. Now I will start to learn to use it.

I think that for many users explicitly declaring widgets and binding them to a function is easier to understand than parameterized classes, Param and annotations.

Let me know if there is anything I should do.

[jbednar]

Suggested change

	Whether the function will be automatically evaluated when one
	of the parameter dependencies change.
	Whether to evaluate the function automatically whenever one of the
	bound parameters changes.

[jbednar]

Suggested change

	Whether the function will be automatically evaluated when one
	of the parameter dependencies change.
	Whether to evaluate the function automatically whenever one of the
	bound parameters changes.