/*
 * Renders a poll ajax-style, whose state is appropriate for the client browser.
 */
 function renderPoll() {
    try {
        if (location.protocol.toLowerCase() == 'https:')
        {
            var secureHTTP = pollUrl.replace("http:/", "https:/");
            pollUrl=secureHTTP;
        }

        // Get an AJAX object
        var ajaxRequest = getAjaxObject(pollUrl, "");

        // send the request
        ajaxRequest.send("");

        // prevent default from occuring
        return false;
    }
    catch (exception) {
        alert(exception);
    }
 }

/*
 * Submits a poll ajax-style, and replaces that poll form with the poll's results page.
 * Requires: previous definition of script var "containerId" (the ID attibute of the poll form's container element.)
 * Requires: previous definition of script var "formId" (the ID attribute of the poll form)
 * Required: previous definition of script var "submitId" (the ID attribute of the poll form's submit button)
 */
function submitPoll(extraValue) {
    // Get the form that was submitted
    var theForm = document.getElementById(formId);

    // Make sure the form has an action specified
    var theAction = theForm.getAttribute("action");

    // Build the submitted data
    var submittedData = getSubmittedData(theForm);
    if ((extraValue != undefined) && (null != extraValue) && (extraValue != '')) // In case user click "getResults" only
    {
        submittedData += extraValue;
    }

    // Get an AJAX object
    var ajaxRequest = getAjaxObject(theAction, submittedData);

    // send the request.
    ajaxRequest.send(submittedData);

    // prevent default from occuring
    return false;
}

/*
 * Retrieves a (ready-to-use) ajax object.
 */
function getAjaxObject(action, data) {
    var ajaxObject = null;
    if(window.XMLHttpRequest) ajaxObject = new XMLHttpRequest();
    else if(new ActiveXObject('Msxml2.XMLHTTP')) ajaxObject = new ActiveXObject('Msxml2.XMLHTTP');
    else if(new ActiveXObject('Microsoft.XMLHTTP')) ajaxObject = new ActiveXObject('Microsoft.XMLHTTP');
    ajaxObject.open("POST", action, true);
    ajaxObject.onreadystatechange = function() {
        if(ajaxObject.readyState==4) {
            displayResults(ajaxObject.responseText);
        }
    }
    ajaxObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    ajaxObject.setRequestHeader("Content-length", data.length);
    ajaxObject.setRequestHeader("Connection", "close");
    return ajaxObject;
}

/*
 * Callback function to display results.
 */
function displayResults(response) {
    try {
        document.getElementById(containerId).innerHTML = response;
    }
    catch (exception) {
        document.getElementById(parentContainerId).innerHTML = response;
    }
}


/*
 * Retrieves the data expected by the poll handler.
 */
function getSubmittedData(theForm) {
    var theData = "";
    for (i=0; i<theForm.childNodes.length; i++) {
        if (theForm.childNodes[i].tagName == "INPUT") {
            if (theForm.childNodes[i].type == "text"  ||  theForm.childNodes[i].type == "hidden") {
                theData += theForm.childNodes[i].name + "=" + theForm.childNodes[i].value + "&";
            }
            if (theForm.childNodes[i].type == "checkbox") {
                if (theForm.childNodes[i].checked) {
                    theData += theForm.childNodes[i].name + "=" + theForm.childNodes[i].value + "&";
                }
                else {
                    theData += theForm.childNodes[i].name + "=&";
                }
            }
            if (theForm.childNodes[i].type == "radio") {
                if (theForm.childNodes[i].checked) {
                    theData += theForm.childNodes[i].name + "=" + theForm.childNodes[i].value + "&";
                }
            }
        }
        if (theForm.childNodes[i].tagName == "SELECT") {
            var sel = theForm.childNodes[i];
            theData += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
        }
    }
    return theData;
}
/*
 * Retrieves a poll's results without requiring user input.
 */
function getResults(questionName)
{
    var theForm = document.getElementById(formId);
    theForm.saveRMI.value='false';
    if ((questionName == undefined) || (null == questionName))
    {
        theForm.defaultResponse.checked=true;
        return submitPoll();
    }
    else
    {
        var qName = 'question('+questionName+')';
        return submitPoll(qName+'=myvalue');
    }
}