this is how i set value to a combobox using dwr call,

var reportID = '<%=reportid%>'; var reportName = '<%=reportname%>'; loadReportNames(reportUserID);

function loadReportNames(reportUserID){
    CustomiseReportAction.getReportNames(reportUserID, addReportNamesDropDown);
}
function addReportNamesDropDown(resultMap){
    dwr.util.removeAllOptions("reportnames");
    dwr.util.addOptions("reportnames",resultMap);
}

after loading the combo box i set values to loaded combo like this,

document.getElementById("reportnames").value=reportID;

but the reportID is not set,

what could be the problem please help me to resolve this.

UPDATE :

function addCombo() { var reportID = '<%=reportid%>'; var reportName = '<%=reportname%>'; var textb = document.getElementById("reportnames");

var option = document.createElement("option");
option.text = reportName;
option.value = reportID;
option.selected="selected";
try {
    textb.add(option, null); //Standard
}catch(error) {
    textb.add(option); // IE only
}
textb.value = "";

}

used above method it gives me no exception but no results.

Regards