ListGrid fetchdata is making 2 calls

[subashk]

SmartClient : Smartclient v8.2p_2012-06-07 - Power Edition
Browser : IE 9

Issue : while making a listgrid.fetchData(criteria,callback,requestProperties) we see that 2 server calls are made which is causing the same sql to execute 2 times. Here is a sample of our listGrid and we call fetchData from multiple places and no matter where it is called we see 2 requests.

ID: "DummyList",
width: "100%",
height: "100%",
autoDraw:false,
dataSource: DummyDS,
autoFetchData: false,
canHover:true,
bodyOverflow:"hidden",
bodyBackgroundColor: "#FFFFFF",
leaveScrollbarGap: false,
showFilterEditor:false,
canSort:false,
canResizeFields:false,
canAutoFitFields:false,
showHeaderContextMenu:false,
filterOnKeypress: true,
allowFilterExpressions: true,
headerHeight: 40,
dataProperties:{useClientFiltering:false},

[Isomorphic]

There are lot of different ways you could cause two requests (one would be calling fetchData() twice).

If you believe this is due to a framework bug, you should put together a minimal, ready-to-run test case.

[subashk]

Ok, this is what is happening.

We implemented pagination using this piece of code (http://forums.smartclient.com/showthread.php?t=22189&highlight=pagination) which works fine as required.

ListGrid sends startRow and endRow 0, 24 (not sure why 24 since we calculate how many rows it can fit from listgrid height-filter space), but we send response only 16 rows as it can fit only those and set the
dsResponse.setStartRow(0L);
dsResponse.setEndRow(list.size()); // 16

on the fetch callback we see ListGrid trying to make another call to get next set as it is thinking it can fit more... any idea why?

[Isomorphic]

See the docs for drawAheadRatio and drawAllMaxCells.

[subashk]

Actually, the issue was happening due to ListGrid's dataPageSize was set
ListGrid.dataPageSize = pageSize;

After removing this, it's making only one call. Thanks.