rich:datascroller data loading

victoria122 Nov 13, 2008 5:12 AM

Hello,

I have a basic rich:dataTable which fetches 20 rows of data and the tag is set to display 20 on screen. I then have a rich:datascroller tag which I was hoping would allow me to fetch the next 20 items when the scroller is used. However I've found that the scroller only works if the data behind the table is already present?! Has anyone used the datascroller in a similar situation to fetch data only when required? Does anyone have any examples / suggestions?

Thank you
Victoria

1. Re: rich:datascroller data loading

janson12 Nov 13, 2008 6:44 AM (in response to victoria122)

Hi,
hope i got u right; as the design+functionality of the datascroller (such as number of pages+styles of controls...) is generated based upon the collection to which the target table refers your data/collection must be present right from the start. apart from that there's no real reason for fetching the data heap wise.
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2. Re: rich:datascroller data loading

victoria122 Nov 13, 2008 6:50 AM (in response to victoria122)

Hi Janson,

Yeah, from what I've found so far there isn't a way to fetch only 20 of total 200 items and still have the rich:datascroller. It appears that the datascroller asks the table how many rows it has and because I've only loaded 20, the scroller believes there is no need for scrolling...

I can't use the datascroller at present because the lists of data are likely to be close to 1 million items. So I'm currently adding my custom paging controls back in, but it would be much 'nicer' to use the rich:datascroller.

Thanks
Victoria
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3. Re: rich:datascroller data loading

lauri Nov 13, 2008 7:12 AM (in response to victoria122)

Have a look to docs related to ExtendedDataModel.
I.e. under "ExtendedDataModel" tab http://livedemo.exadel.com/richfaces-demo/richfaces/dataTable.jsf?tab=dataModel

Code looks frightening. But once explored it is easy to use.
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4. Re: rich:datascroller data loading

ilya_shaikovsky Nov 13, 2008 7:14 AM (in response to victoria122)

yes.. at these fourm already present a couple of posts from guys who successfully implemented lazy loading using data model
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5. Re: rich:datascroller data loading

victoria122 Nov 13, 2008 7:31 AM (in response to victoria122)

Thank you all, I shall take a look at the dataModel
Victoria
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