Mode / Broadcast / Global
Launch the server in broadcast mode to synchronize browser state across users.
Global variables can be used to manage state.
Open /demo in multiple browsers and watch them synchronize in realtime.
from h2o_wave import main, app, Q, ui, pack
count = 0
@app('/demo', mode='broadcast')
async def serve(q: Q):
global count
if 'increment' in q.args:
count += 1
items = pack([ui.button(name='increment', label=f'Count={count}')])
if count > 0:
form = q.page['example']
form.items = items
else:
q.page['example'] = ui.form_card(box='1 1 12 10', items=items)
await q.page.save()