var combo = form.getCombo("tabletype");
combo.loadXML("ComboConnector.ashx?strSQL=SELECT TABLE_TYPE,FIELD_NAME FROM MASTER_PARAMETER_DEF ORDER BY TABLE_TYPE &strValueColumn=FIELD_NAME &strNameColumn=TABLE_TYPE",function(){
combo.addOption("ALL", "ALL");
});
I use the above code to get options in a combo. But in the options, it has many duplicate options in combo. I want to ask how prevent this duplicate options in combo ?