jsf - Getting properties of <p:dataScroller> in backing bean -

how can following properties of <p:datascroller> in backing bean?

1. page index (on page in pagination on)
2. page count
3. page index
4. first row index
5. last row index

i tried component binding, returns null.

the <p:datascroller> has ton of issues, if want these properties, have them indirectly, because if don't use lazydatamodel, datascroller fetches data @ once , goes away stuff, never calling managedbean.

use lazy load model. have quick implementation of org.primefaces.model.lazydatamodel around 20 lines of code. create method on managedbean returns sublist requested; inside managed bean fetch values want.

import java.util.list; import java.util.map;  import org.primefaces.model.lazydatamodel; import org.primefaces.model.sortorder;  class msgloglazymodel extends lazydatamodel<yourpojo> {     private static final long serialversionuid = 1l;     private managedbean mb;      public msgloglazymodel(managedbean mb) {         this.mb = mb;     }      @override     public list<yourpojo> load(int first, int pagesize, string sortfield,             sortorder sortorder,             map<string, object> filters) {         return mb.loaditens(first, pagesize, sortorder, filters);     }    } 

yourpojo should object passing datascroller display.

assuming items have display stored in mb property

private list<yourpojo> mylist; 

now on mb.loaditens() capture:

1. page index (on page in pagination on)

int pageindex = first / pagesize;

2. page count

// have round because last page have less pagesize itens
int pagecount = (int) math.ceil(mylist.size() / new double(pagesize));

3. page index

you repeating yourself.

4. first row index

i assume want first row of chunk returned. first parameter. since datascroller not have pagination...

5. last row index

// maybe list has ended. take safe path...
int lastrow = math.min(mylist.size(), first + pagesize)