Issue while reloading jqgrid with scroll:true, initiates multiple ajax calls to load data

I have a jqgrid on my page which loads the first page of data while initializing. The scroll appears if there are more pages.

Problem is, if i scroll downs to see the second page and then trigger reloadGrid with updated url, it instantiates two ajax calls, with different page number (1 then 2).

In a result, grid is loaded with duplicate data returned against each call.

The above problem didn't appear if i didn't scroll down on first load.

jqGrid Creation Code:

$("#myGrid").jqGrid({ 
    url: 'test.do',
    datatype: 'json',
    mtype: 'POST',
    colNames: ['', 'Item No.', 'HS Code', 'Goods Description', 'Quantity', 'Value', ''], 
    colModel: [{name:'itemId',       index:'itemId',       hidden:true},
               {name:'itemNo',       index:'itemNo',       width:100, align:'center', sortable:false}, 
               {name:'hsCode',       index:'hsCode',       width:100, align:'center', sortable:false}, 
               {name:'goodsDesc',    index:'goodsDesc',    width:350, align:'left',   sortable:false},
               {name:'itemQuantity', index:'itemQuantity', width:110, align:'right',  sortable:false},
               {name:'itemValue',    index:'itemValue',    width:110, align:'right',  sortable:false},
               {name:'action',       index:'action',       width:60,  align:'center', sortable:false}],
    width: 1000,
    height: 230,
    rowNum: 10,
    shrinkToFit: false,
    viewrecords: true,
    emptyrecords: "No Record Found.",
    multiselect: false, 
    scroll: true,
    jsonReader: {repeatitems:false, id:"0"}
});

Code for reloading grid with new URL:

newURL = 'test.do?itemNo=3';
jQuery("#myGrid").jqGrid('set开发者_StackOverflow中文版GridParam',{url:newURL,datatype:'json'}).trigger("reloadGrid",[{page:1}]);

AJAX calls after reload:

http://abc.com/test.do?itemNo=3&page=1
http://abc.com/test.do?itemNo=3&page=2

Any body have any idea why it is happening??

I have tried the following parameters in jqgrid creation script and it resolved the above issue:

set parameter scroll:1 instead of scroll:true then add new parameter prmNames:{npage:1}

Reference: jqGridWiki:options in section: prmNames, scroll