Context Menu

Display a context menu on a card.

import json
from h2o_wave import main, app, Q, ui, data
# Vega lite spec for a bar plot, defaults to linear scale.
spec_linear_scale = json.dumps(dict(
mark='bar',
encoding=dict(
x=dict(field='a', type='ordinal'),
y=dict(field='b', type='quantitative')
)
))
# Vega lite spec for a bar plot, log scaled.
spec_log_scale = json.dumps(dict(
mark='bar',
encoding=dict(
x=dict(field='a', type='ordinal'),
y=dict(field='b', type='quantitative', scale=dict(type='log'))
)
))
# Data for our plot.
plot_data = data(fields=["a", "b"], rows=[
["A", 28], ["B", 55], ["C", 43],
["D", 91], ["E", 81], ["F", 53],
["G", 19], ["H", 87], ["I", 52]
])
# Create a couple of context menu commands.
log_scale_command = ui.command(
name='to_log_scale',
label='Log Scale',
icon='LineChart',
)
linear_scale_command = ui.command(
name='to_linear_scale',
label='Linear Scale',
icon='LineChart',
)
@app('/demo')
async def serve(q: Q):
if q.client.plot_added: # Have we already added a plot?
example = q.page['example']
if q.args.to_log_scale:
# Change to log scale
example.title = 'Plot (Log Scale)',
example.specification = spec_log_scale
example.commands = [linear_scale_command]
else:
# Change to linear scale
example.title = 'Plot (Linear Scale)',
example.specification = spec_linear_scale
example.commands = [log_scale_command]
else: # Add a new plot
q.page['example'] = ui.vega_card(
box='1 1 2 4',
title='Plot (Linear Scale)',
specification=spec_linear_scale,
data=plot_data,
commands=[log_scale_command],
)
# Flag to indicate that we've added a plot
q.client.plot_added = True
await q.page.save()

Tags: โ€‚context_menu