dojo.data - simple paging example

For people intested in the dojo.data design...

We've been talking about how we want scrolling and paging to work for 
large result sets.  If there's a large result set, the UI might allow 
the user to go from page to page through the results.  Or the UI might 
have a large scroll-view, and incrementally load data as the user scrolls.

We've been talking about what the datastore API should look like for 
that use case.  One option is for the GUI code make separate calls to 
store.find() each time the user pages forward, with each call getting a 
new result object, one result object per page of data.  Another option 
is for the the GUI code make one initial call to store.find() to get a 
single result object, and then make separate calls to result.forEach(), 
each time asking to loop over just a portion of the virtual result set. 
 The question is, should we encourage just that first option, or just 
the second, or allow for both?

As a quick exercise to make all of this more concrete, this weekend I 
wrote some test code that uses the second option (one result object and 
multiple calls to result.forEach()).  The test code uses the Yahoo web 
services APIs to run a Yahoo query, and then you can page through the 
results.

I'm including the code as an attachment here, if you want to play around 
with it.  To use it, first create a new "yahoo" folder in your dojo 
tests/data directory:
  trunk/tests/data/yahoo
Unzip the attachment, drop the contents into the yahoo folder, and open 
the "paging_example.html" file.

If you're looking at the code, the place to start is paging_example.js. 
 There's a method runSearch(), which has the call to store.find(), and 
there's a method displayPage(), which has the call to result.forEach().

Let me know if you run into problems, and I can try sending the files in 
some other format.

:o) Skinner

paging_example.zip
Description: Zip compressed data

_______________________________________________
dojo-contributors mailing list
dojo-contributors@xxxxxxxxxxxxxxx
http://dojotoolkit.org/mailman/listinfo/dojo-contributors