a, thank you so much for your detail info, anthony. i've tried it but still
not work (no error occured), but what i'm expected to clear the session
data is not achieve. i'm not sure why this is happened.
*#controller : default.py*
def order_callback():
id=int(request.vars.id)
if request.vars.action=='add':
session.order[id]=session.order.get(id, 0)+1
if request.vars.action=='subtract':
session.order[id]=max(0,session.order.get(id, 0)-1)
if request.vars.action=='remove':
del session.order[id]
redirect(URL('order'))
if request.vars.action=='reset':
session.order.clear()
redirect(URL('product'), client_side=True)
return str(session.order[id])
*#view : order.html*
<table width="100%">
{{for id, qty in order.items():}}
{{p=db.product(id)}}
<tr>
<td>{{=SPAN(p.product_name)}}</td>
<td>{{=SPAN('Rp. %s' % p.unit_price)}}</td>
<td>{{=SPAN(qty, _id='item_%s' % p.id)}}</td>
<td>{{=SPAN(A('Add', callback=URL('order_callback',
vars=dict(id=p.id, action='add')), target='item_%s' % p.id, _title='Add
Quantity', _class='btn btn-navbar'))}} {{=SPAN(A('Subtract',
callback=URL('order_callback', vars=dict(id=p.id, action='subtract')),
target='item_%s' % p.id, _title='Substract Quantity', _class='btn
btn-navbar'))}} {{=SPAN(A('Remove', callback=URL('order_callback',
vars=dict(id=p.id, action='remove')), delete='tr', _title='Remove %s from
Order' % p.product_name, _class='btn btn-navbar'))}} </td>
</tr>
{{pass}}
</table>
{{=SPAN(A('Empty', callback=URL('order_callback', vars=dict(id=p.id,
action='empty')), target='item_%s' % p.id, _title='Empty Order',
_class='btn btn-navbar'))}}
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