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onSelect:function(param){
onThirdClick(param);
}
<input id="firstSelectBox" class="easyui-combobox"
data-options="
valueField: 'itemCode',
textField: 'itemName',
value:'===请选择===',
url: '${pageContext.request.contextPath}/Category_findFirstName.action',
onSelect: function(rec){
var url ='${pageContext.request.contextPath}/Category_findsecondName.action?itemCode='+ rec.itemCode;
$('#secondSelectBox').combobox('reload', url);
$('#secondSelectBox').combobox('clear', url);
$('#thirdSelectBox').combobox('clear', url);
$('#fourSelectBox').combobox('clear', url);
}" />
<input id="secondSelectBox" class="easyui-combobox"
data-options="
valueField:'itemCode',
textField:'itemName',
onSelect: function(rec){
var url ='${pageContext.request.contextPath}/Category_findThirdName.action?itemCode='+ rec.itemCode;
$('#thirdSelectBox').combobox('reload', url);
$('#thirdSelectBox').combobox('clear', url);
$('#fourSelectBox').combobox('clear', url);
}" />
<input id="thirdSelectBox" class="easyui-combobox"
data-options="
valueField:'itemCode',
textField:'itemName',
onSelect: function(rec){
var url ='${pageContext.request.contextPath}/brand_findByItemCode.action?itemCode='+ rec.itemCode;
$('#fourSelectBox').combobox('reload', url);
$('#fourSelectBox').combobox('clear', url);
}
" />
<!-- 第四级下拉框 -->
<input id="fourSelectBox" class="easyui-combobox"
data-options="
valueField:'brdCode',
textField:'brdName',
multiple:'true'
" />