rich:dataTable rich:datascroller ExtendedDataModel

[bgregory]

Can someone explain to me why the walk() method in the ExtendedDataModel is called 4 times after the datascroller is clicked. I am using the code straight from the richface demo (pretty much) except I've implemented my own DataProvider.

On the first page load the walk() method is called once with firstRow = 0 and numberofRows = 10. If page 2 is clicked on the datascroller, then walk() method is called as follows:

12:34:39,511 INFO [BaseEDM] [http-127.0.0.1-8080-2] walk(0,10)
12:34:41,665 INFO [BaseEDM] [http-127.0.0.1-8080-2] walk(0,10)
12:34:43,624 INFO [BaseEDM] [http-127.0.0.1-8080-2] walk(0,10)
12:34:45,581 INFO [BaseEDM] [http-127.0.0.1-8080-2] getRowCount()
12:34:45,584 INFO [BaseEDM] [http-127.0.0.1-8080-2] getRowCount()
12:34:45,595 INFO [BaseEDM] [http-127.0.0.1-8080-2] walk(10,10)

Why the first 3 times with firstRow = 0 and numberOfRows = 10 when the datatable should be pulling only the 10,10?

[bgregory]

Answered my own question: Apparently I had the pager control set to ajaxSingle="false". Unfortunately I needed this in order to keep filtering state with a request scope backing bean.

How does one keep the filter/sort state without this side-effect?

[bgregory]

Ok, more strange behavior - when attempting to do filtering as described in the demo, entering a value in the filter causes the walk() method to be called 4 times.

Can someone explain this please?

[bgregory]

13:42:57,028 INFO [BaseEDM] [http-127.0.0.1-8080-1] walk(0,20) [org.ajax4jsf.component.UIDataAdaptor]
13:42:59,890 INFO [BaseEDM] [http-127.0.0.1-8080-1] walk(0,20) [org.ajax4jsf.component.UIDataAdaptor]
13:43:02,994 INFO [BaseEDM] [http-127.0.0.1-8080-1] walk(0,20) [org.ajax4jsf.component.UIDataAdaptor]
13:43:05,707 INFO [BaseEDM] [http-127.0.0.1-8080-1] getRowCount()
13:43:05,829 INFO [BaseEDM] [http-127.0.0.1-8080-1] getRowCount()
13:43:05,832 INFO [BaseEDM] [http-127.0.0.1-8080-1] getRowCount()
13:43:05,834 INFO [BaseEDM] [http-127.0.0.1-8080-1] walk(0,20) [org.ajax4jsf.component.UIDataAdaptor]

[nbelaevski]

Hello,

The first tree walks are executed for 2nd-4th phases (request processing) and the 4th is executed on the 6th phase (data table is rendered).

[nbelaevski]

Sorry, should be: the first three walks

[bgregory]

So how do I keep it from re-querying the database for the first 3 phases - esp, since I know I just going to replace the data from the database every time anyway?