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# Mode / Multicast
# Launch the server in #multicast #mode to synchronize browser state across a user's clients.
# Open `/demo` in multiple browsers and watch them synchronize in realtime.
# ---
from h2o_wave import main, app, Q, ui
@app('/demo', mode='multicast')
async def serve(q: Q):
if not q.client.initialized:
if q.user.count is None:
q.user.count = 0
q.page['example'] = ui.form_card(box='1 1 2 1', items=[
ui.button(name='increment', label=f'Count={q.user.count}')
])
q.client.initialized = True
if q.args.increment:
q.user.count += 1
q.page['example'].increment.label = f'Count={q.user.count}'
await q.page.save()
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