[web2py] ajax callback not work in form()

[黄祥]

hi,

i've tried to learn ajax callback using form(), but it's not work (no error 
occured), did anyone know the solution for this?
thank you very much before

here is my code:
*#controller*
def order_callback():
    id=int(request.vars.id)
    quantity=int(request.vars.quantity)
    if request.vars.action=='add':
        session.order[id]=session.order.get(id, 0)+quantity
    return str(session.order[id])

def product():
    rows=db((db.product.quantity>0) & (db.product.is_active == 
True)).select(limitby=limitby, orderby=~db.product.id, cache=(cache.ram, 
10))
    form=FORM(INPUT(_id='sale_quantity', _name='quantity', _type='text', 
_size='3', requires = IS_NOT_EMPTY(error_message='cannot be empty!')))
    return dict(rows=rows, form=form)

*#view*
*testing 1** not work no error occured:*
    {{for i,row in enumerate(rows):}}
    {{if i==items_per_page: break}}
        <tr>
            <td>{{=SPAN(row.product_name)}}
            </td>
            <td>{{=SPAN(session.order.get(row.id,0), _id="item%s"%row.id), 
T(' In Order')}}
            </td>
            <td>{{=form}}
            </td>
*            <td>{{=A('Order Now!!!', callback=URL('order_callback', 
vars=dict(id=row.id, quantity=request.vars.quantity, action='add')), 
target='item%s'%row.id, _title='Add the Order', _class='btn btn-navbar')}}*
*            </td>*
        </tr>
    {{pass}}
*
testing 2 not work no error occured:*
    {{for i,row in enumerate(rows):}}
    {{if i==items_per_page: break}}
        <tr>
            <td>{{=SPAN(row.product_name)}}
            </td>
            <td>{{=SPAN(session.order.get(row.id,0), _id="item%s"%row.id), 
T(' In Order')}}
            </td>
            <td>{{=form}}
            </td>
*            <td>{{=A('Order Now!!!', callback=URL('order_callback', 
vars=dict(id=row.id, quantity=form.vars.quantity, action='add')), 
target='item%s'%row.id, _title='Add the Order', _class='btn btn-navbar')}}*
*            </td>*
        </tr>
    {{pass}}
*

testing 3 not work no error occured:*
    {{for i,row in enumerate(rows):}}
    {{if i==items_per_page: break}}
        <tr>
            <td>{{=SPAN(row.product_name)}}
            </td>
            <td>{{=SPAN(session.order.get(row.id,0), _id="item%s"%row.id), 
T(' In Order')}}
            </td>
            <td>{{=form}}
            </td>
*            <td>{{=A('Order Now!!!', callback=URL('order_callback', 
vars=dict(id=row.id, quantity='quantity', action='add')), 
target='item%s'%row.id, _title='Add the Order', _class='btn btn-navbar')}}*
*            </td>*
        </tr>
    {{pass}}

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