java - Implement SimplePager with DataGrid and AsyncDataProvider -


how implement simplepager asyncdataprovider when data grid provided values fectched server.

you have create class extending asyncdataprovider. in class can override onrangechanged-method.

my class example looks this:

public class asynclistprovidervisit extends asyncdataprovider<myobject> {      @override     protected void onrangechanged(hasdata<myobject> display) {         // new range.         final range range = display.getvisiblerange();          /*          * query data asynchronously. if using database, can          * make rpc call here. we'll use timer simulate delay.          */          final int start = range.getstart();         int length = range.getlength();          service.util.getinstance().getpartofimmoobjects(start, length, new asynccallback<list<myobject>>() {              @override             public void onfailure(throwable caught) {                 confirmationpanel cp = new confirmationpanel();                 cp.confirm("error!", "an error occurred during data-loading.");             }              @override             public void onsuccess(list<myobject> result) {                 if (result != null) {                     updaterowdata(start, result);                 }             }         });     } }

then need create datagrid, asyncprovider , pager, this:

// create celllist. datagrid<lcvisits> grid = new datagrid<lcvisits>();  // create data provider. asynclistprovidervisit dataprovider = new asynclistprovidervisit();  // add celllist dataprovider. dataprovider.adddatadisplay(grid);  // create paging controls. simplepager pager = new simplepager(); pager.setdisplay(grid);  // , add them panel, container, whatever container.add(grid); container.add(pager);

edit

as andre pointed out in comment need fetch correct row-count query. did "fake-object", add list , delete on client side. can call updaterowcount(rowcount, isexact) isexcact boolean indicating whether row-count entered exact count or estimated.


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