私はJavaScriptで解決策を見つけました:
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib prefix="sj" uri="/struts-jquery-tags"%>
<%@ taglib prefix="sjg" uri="/struts-jquery-grid-tags"%>
<div id="prije">Prije</div>
<s:url var="remoteurl" action="jsontable" />
<sjg:grid id="gridtableID"
caption="Primjer JSON TABELE"
dataType="json"
href="%{remoteurl}"
gridModel="gridModel"
viewrecords="true"
pager="true"
pagerPosition="centar"
navigator="true"
navigatorSearch="true"
filter="true"
filterOptions="{stringResult:true}"
loadonce="true"
>
<sjg:gridColumn name="id"
index="id" title="ID"
formatter="integer"
search="false"
searchoptions="{sopt:['cn','eq','ne','bw','bn','ew','en','nc']}"
editable="false" />
<sjg:gridColumn name="name" index="name" title="Name" sortable="true"
search="true"
searchoptions="{sopt:['cn','eq','ne','bw','bn','ew','en','nc']}" />
<sjg:gridColumn name="country" index="country" title="Country"
search="true"
searchoptions="{sopt:['cn','eq','ne','bw','bn','ew','en','nc']}"/>
<sjg:gridColumn name="city" index="city" title="City" search="true"
searchoptions="{sopt:['cn','eq','ne','bw','bn','ew','en','nc']}" />
<sjg:gridColumn name="creditLimit" index="creditLimit"
title="Credit Limit" formatter="currency" search="true"
searchoptions="{sopt:['cn','eq','ne','bw','bn','ew','en','nc']}"/>
</sjg:grid>
<script>
$(document).ready(function(){
$("#gridtableID").jqGrid('setGridParam', { ignoreCase: true});
});
</script>