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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