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From Reinhard Poetz <reinh...@apache.org>
Subject [cforms] Repeater and large collections
Date Tue, 07 Dec 2004 13:28:49 GMT

Suppose you have a repeater that is bound to a potentially very large collection 
of objects (e.g. a list with 8000 objects) provided by an O/R-mapper.
First, it is not a good idea to show all 8000 rows on one page. Some kind of 
paginating functionality is needed. Does anyone have a working "paging" solution?

Second, I don't want to bind, let's say 10000 objects (means copying 10000 
objects!) to a repeater, though the user should have the possibility to edit all 
rows.

I can think of

a) Don't use cForms for the table. Each row has an "edit" button and after 
clicking it, a new page that only shows a single object opens.

  + use lazy loading features of O/R mapping tool
    --> low memory consumption
  - works around the cForms framework
    --> how to implement "mass operations" like deleting a group of objects?

b) Use cForms and event handling "magic" to load as less objects into the 
reapeater as possible.

  + use cForms framework and its validation features
  - when are the changed repeater rows written back?
    --> a user browses the rows and he only changes some of the fields
        the changes should only be written when the form is submitted.
        This would require a destinction between changed rows and temporary
        rows that are shown. When saving the changed rows only those are
        written back.
        Question to the binding specialists: How difficult would an
        implementation be? Or, any better ideas?

WDYT? Other suggestions?

-- 
Reinhard

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