How XAI implements 'get more' function in CC&B pages

Question

Hi all,
There is a 'get more' button in CC&B page if you list more than 50 records, just clicking the button when I wanna get last records , but how should i implement the same function by XAI, I have researched much time about this issue and gotten nothing. so had Anybody here encounterd the same issue? and have solved it?
any help would be appreciated.

Answer 1

The get more function works in the browser becuase there is a seperate "list" servlet which retrievs the data. It relies on certain HTTP context data for correct operation. Unfortunately the "get more" function is not supported by the XAI Servlet (it does not about the HTTP context data). Your only option is to roll your own paging mechnaism for the data you require.
The pattern goes likes this...
1. Work out the SQL for what you want to paginate
2. Create a new "List Service" class that will act as the underlying service
3. Annotate the service with inputs which include the page size, and the page number you want to retrieve
4. Annotate the service with a list data that will be returned
5. Use the page size and page number to create and execute the query and build the return result
6. Register the service as an XAI Inbound Service
7. Deploy the code
8. Test using Dynamic Submission
eg. Here is an example of Get More for Lookup Values....
import com.splwg.base.api.BusinessEntity;
import com.splwg.base.api.SimpleEntityList;
import com.splwg.base.api.service.DataElement;
import com.splwg.base.api.service.ItemList;
import com.splwg.base.api.service.ListBody;
import com.splwg.base.domain.common.lookup.LookupField_Id;
import com.splwg.base.domain.common.lookup.LookupValue;
import com.splwg.base.domain.common.lookup.LookupValue_Id;
import com.splwg.base.support.service.metainfo.ListBodyField;
import com.splwg.shared.environ.ServiceListConstant;
import com.splwg.shared.logging.Logger;
import com.splwg.shared.logging.LoggerFactory;
* @author edhoi
@ListService (name = CmGetMoreListValues, size = 10000, program = CMLGETMRL, service = CMLGETMRL,
* body = @DataElement (contents = { @DataField (name = COUNTER)
* , @RowField (entity = lookupValue, name = lookupValue)}),
* headerFields = { @DataField (name = ELEM_SIZE)
* , @DataField (name = FIELD_NAME)
* , @DataField (name = FIELD_VALUE)})
public class CmGetMoreListMaintenance extends CmGetMoreListMaintenance_Gen {
     private static final Logger LOG = LoggerFactory.getLogger(CmGetMoreListMaintenance.class);
     @Override
     protected ItemList<DataElement> readList() {
          // Call CmGetMoreBusinessComponent
          CmGetMoreBusinessComponent cmGetMoreBusinessComponent = CmGetMoreBusinessComponent.Factory
                    .newInstance();
          LookupField_Id lookupField_Id = new LookupField_Id(getHeader().get(
                    CmGetMoreListMaintenance.STRUCTURE.HEADER.FIELD_NAME));
          LookupValue_Id lookupValueId = new LookupValue_Id(lookupField_Id,
                    getHeader().get(
                              CmGetMoreListMaintenance.STRUCTURE.HEADER.FIELD_VALUE));
          BigInteger pageSize = getHeader().get(
                    CmGetMoreListMaintenance.STRUCTURE.HEADER.ELEM_SIZE);
          LookupValue lastValue = lookupValueId.getEntity();
          List<LookupValue> values = cmGetMoreBusinessComponent
                    .getLookupValuePageData(lookupField_Id, lastValue, pageSize
                              .intValue());
          long count = cmGetMoreBusinessComponent
                    .countLookupValues(lookupField_Id);
          if (values.size() > 0) {
               lastValue = values.get(values.size() - 1);
          } else {
               lastValue = null;
          ItemList<DataElement> itemList = new ItemList<DataElement>(CmGetMoreListMaintenance.STRUCTURE.list_CmGetMoreListValues.name);
          ListBody listBody = itemList.newListBody();
          listBody.put(CmGetMoreListMaintenance.STRUCTURE.list_CmGetMoreListValues.COUNTER, new BigInteger(
                    Long.toString(count)));
          if(lastValue != null) {
               listBody.put(CmGetMoreListMaintenance.STRUCTURE.list_CmGetMoreListValues.FIELD_VALUE, lastValue.getId().getFieldValue());
          for (LookupValue value : values) {
               DataElement listElement= itemList.newDataElement();
               listElement.addRow(value.getDTO());
          return itemList;
     @Override
     protected void afterPopulateList_CmGetMoreListValues(
               ItemList<DataElement> targetList, SimpleEntityList sourceList,
               BusinessEntity sourceListParent) {
          // TODO Auto-generated method stub
          super.afterPopulateList_CmGetMoreListValues(targetList, sourceList,
                    sourceListParent);
}