I am fond of a design pattern whereby a list of records (such as
orders) is displayed in the top part of a view and the detail for a
highlighted record is displayed in the lower part of the view via AJAX
onclick (such as the customer and product details for the order).
I like web2py because I want a "higher-level" tool that allows be to
do more with less code. But when I tried implementing my favorite
design pattern with the web2py CRUD and AJAX helpers, I found the code
to be quite awkward, namely:
I give the list view table and id as a CRUD parameter which I use to
add the onclick event to the table rows on domready:
order_list = crud.select(db.os_order,_id='order_list',...
and:
$('#order_list tbody tr').click(function() {
var order_id = $(this).find('.order_id').attr('id');
ajax('default/orderdetail',[order_id],'order_detail_div');
});
But here's the really ugly part of the design:
In order to get the record id I have to represent my ID field with a
hidden INPUT element:
db.os_order.id.represent = lambda value: (value,
INPUT(_type='hidden', _id=value,_value=value, _class='order_id'))
And in order to uniquely identify the element and pass it's value to
the web2py AJAX helper I give the record ID as both it's "id" and
"value" attributes. Which leads to the unhappy retrieval in the
controller by means of:
order_id = list(request.vars)[0]
All of this seems a bit un-elegant, don't you think? I guess I could
do away with the web2py AJAX helper and use a for loop to add
id="order_123" to my table rows, but now I'm back to building forms
from scratch - so what's the point of the web2py high-level helpers?
If somebody could point out a way to implement this design pattern in
a more elegant fashion by still leveraging web2py form helpers, it
would be much appreciated.
Thanks.
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