ajax poller

var serverSideFile = 'ajax-poller-cast-vote-php.php';
var voteLeftImage = 'images/graph_left_1.gif';
var voteRightImage = 'images/graph_right_1.gif';
var voteCenterImage = 'images/graph_middle_1.gif';
var graphMaxWidth = 130; // It will actually be a little wider than this because of the rounded image at the left and right
var graphMinWidth = 15; // Minimum size of graph
var pollScrollSpeed = 5; // Lower = faster
var useCookiesToRememberCastedVotes = false; // Use cookie to remember casted votes
var txt_totalVotes = 'Total number of votes: ';
var ajaxObjects = new Array();
var pollVotes = new Array();
var pollVoteCounted = new Array();
var totalVotes = new Array();
/* Preload images */
var preloadedImages = new Array();
preloadedImages[0] = new Image();
preloadedImages[0].src = voteLeftImage;
preloadedImages[1] = new Image();
preloadedImages[1].src = voteRightImage;
preloadedImages[2] = new Image();
preloadedImages[2].src = voteCenterImage;
/*
These cookie functions are downloaded from
http://www.mach5.com/support/analyzer/manual/html/General/CookiesJavaScript.htm
*/
function Poller_Get_Cookie(name) {
var start = document.cookie.indexOf(name+"=");
var len = start+name.length+1;
if ((!start) && (name != document.cookie.substring(0,name.length))) return null;
if (start == -1) return null;
var end = document.cookie.indexOf(";",len);
if (end == -1) end = document.cookie.length;
return unescape(document.cookie.substring(len,end));
}
// This function has been slightly modified
function Poller_Set_Cookie(name,value,expires,path,domain,secure) {
expires = expires * 60*60*24*1000;
var today = new Date();
var expires_date = new Date( today.getTime() + (expires) );
var cookieString = name + "=" +escape(value) +
( (expires) ? ";expires=" + expires_date.toGMTString() : "") +
( (path) ? ";path=" + path : "") +
( (domain) ? ";domain=" + domain : "") +
( (secure) ? ";secure" : "");
document.cookie = cookieString;
}
function showVoteResults(pollId,ajaxIndex)
{
document.getElementById('poller_waitMessage' + pollId).style.display='none';
var xml = ajaxObjects[ajaxIndex].response;
xml = xml.replace(/\n/gi,'');
var reg = new RegExp("^.*?<pollerTitle>(.*?)<.*$","gi");
var pollerTitle = xml.replace(reg,'$1');
var resultDiv = document.getElementById('poller_results' + pollId);
var titleP = document.createElement('P');
titleP.className='result_pollerTitle';
titleP.innerHTML = pollerTitle;
resultDiv.appendChild(titleP);
var options = xml.split(/<option>/gi);
pollVotes[pollId] = new Array();
totalVotes[pollId] = 0;
for(var no=1;no<options.length;no++){
var elements = options[no].split(/</gi);
var currentOptionId = false;
for(var no2=0;no2<elements.length;no2++){
if(elements[no2].substring(0,1)!='/'){
var key = elements[no2].replace(/^(.*?)>.*$/gi,'$1');
var value = elements[no2].replace(/^.*?>(.*)$/gi,'$1');
if(key.indexOf('optionText')>=0){
var pOption = document.createElement('P');
pOption.className='result_pollerOption';
pOption.innerHTML = value;
resultDiv.appendChild(pOption);
}
if(key.indexOf('optionId')>=0){
currentOptionId = value/1;
}
if(key.indexOf('votes')>=0){
var voteDiv = document.createElement('DIV');
voteDiv.className='result_pollGraph';
resultDiv.appendChild(voteDiv);
var leftImage = document.createElement('IMG');
leftImage.src = voteLeftImage;
voteDiv.appendChild(leftImage);
var numberDiv = document.createElement('DIV');
numberDiv.style.backgroundImage = 'url(\'' + voteCenterImage + '\')';
numberDiv.innerHTML = '0%';
numberDiv.id = 'result_voteTxt' + currentOptionId;
voteDiv.appendChild(numberDiv);
var rightImage = document.createElement('IMG');
rightImage.src = voteRightImage;
voteDiv.appendChild(rightImage);
pollVotes[pollId][currentOptionId] = value;
totalVotes[pollId] = totalVotes[pollId]/1 + value/1;
}
}
}
}
var totalVoteP = document.createElement('P');
totalVoteP.className = 'result_totalVotes';
totalVoteP.innerHTML = txt_totalVotes + totalVotes[pollId];
voteDiv.appendChild(totalVoteP);
setPercentageVotes(pollId);
slideVotes(pollId,0);
}
function setPercentageVotes(pollId)
{
for(var prop in pollVotes[pollId]){
pollVotes[pollId][prop] = Math.round( (pollVotes[pollId][prop] / totalVotes[pollId]) * 100);
}
var currentSum = 0;
for(var prop in pollVotes[pollId]){
currentSum = currentSum + pollVotes[pollId][prop]/1;
}
pollVotes[pollId][prop] = pollVotes[pollId][prop] + (100-currentSum);
}
function slideVotes(pollId,currentPercent)
{
currentPercent = currentPercent/1 + 1;
for(var prop in pollVotes[pollId]){
if(pollVotes[pollId][prop]>=currentPercent){
var obj = document.getElementById('result_voteTxt' + prop);
obj.innerHTML = currentPercent + '%';
obj.style.width = Math.max(graphMinWidth,Math.round(currentPercent/100*graphMaxWidth)) + 'px';
}
}
if(currentPercent<100)setTimeout('slideVotes("' + pollId + '","' + currentPercent + '")',pollScrollSpeed);
}
function prepareForPollResults(pollId)
{
document.getElementById('poller_waitMessage' + pollId).style.display='block';
document.getElementById('poller_question' + pollId).style.display='none';
}
function castMyVote(pollId,formObj)
{
var elements = formObj.elements['vote[' + pollId + ']'];
var optionId = false;
for(var no=0;no<elements.length;no++){
if(elements[no].checked)optionId = elements[no].value;
}
Poller_Set_Cookie('dhtmlgoodies_poller_' + pollId,'1',6000000);
if(optionId){
var ajaxIndex = ajaxObjects.length;
ajaxObjects[ajaxIndex] = new sack();
ajaxObjects[ajaxIndex].requestFile = serverSideFile + '?pollId=' + pollId + '&optionId=' + optionId;
prepareForPollResults(pollId);
ajaxObjects[ajaxIndex].onCompletion = function(){ showVoteResults(pollId,ajaxIndex); }; // Specify function that will be executed after file has been found
ajaxObjects[ajaxIndex].runAJAX(); // Execute AJAX function
}
}
function displayResultsWithoutVoting(pollId)
{
var ajaxIndex = ajaxObjects.length;
ajaxObjects[ajaxIndex] = new sack();
ajaxObjects[ajaxIndex].requestFile = serverSideFile + '?pollId=' + pollId;
prepareForPollResults(pollId);
ajaxObjects[ajaxIndex].onCompletion = function(){ showVoteResults(pollId,ajaxIndex); }; // Specify function that will be executed after file has been found
ajaxObjects[ajaxIndex].runAJAX(); // Execute AJAX function
}

/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* 2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
see documentation or authors website for more details */
function sack(file) {
    this.xmlhttp = null;
    this.resetData = function() {
        this.method = "POST";
        this.queryStringSeparator = "?";
        this.argumentSeparator = "&";
        this.URLString = "";
        this.encodeURIString = true;
        this.execute = false;
        this.element = null;
        this.elementObj = null;
        this.requestFile = file;
        this.vars = new Object();
        this.responseStatus = new Array(2);
    };
    this.resetFunctions = function() {
        this.onLoading = function() { };
        this.onLoaded = function() { };
        this.onInteractive = function() { };
        this.onCompletion = function() { };
        this.onError = function() { };
        this.onFail = function() { };
    };
    this.reset = function() {
        this.resetFunctions();
        this.resetData();
    };
    this.createAJAX = function() {
        try {
            this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e1) {
            try {
                this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e2) {
                this.xmlhttp = null;
            }
        }
        if (! this.xmlhttp) {
            if (typeof XMLHttpRequest != "undefined") {
                this.xmlhttp = new XMLHttpRequest();
            } else {
                this.failed = true;
            }
        }
    };
    this.setVar = function(name, value){
        this.vars[name] = Array(value, false);
    };
    this.encVar = function(name, value, returnvars) {
        if (true == returnvars) {
            return Array(encodeURIComponent(name), encodeURIComponent(value));
        } else {
            this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
        }
    }
    this.processURLString = function(string, encode) {
        encoded = encodeURIComponent(this.argumentSeparator);
        regexp = new RegExp(this.argumentSeparator + "|" + encoded);
        varArray = string.split(regexp);
        for (i = 0; i < varArray.length; i++){
            urlVars = varArray[i].split("=");
            if (true == encode){
                this.encVar(urlVars[0], urlVars[1]);
            } else {
                this.setVar(urlVars[0], urlVars[1]);
            }
        }
    }
    this.createURLString = function(urlstring) {
        if (this.encodeURIString && this.URLString.length) {
            this.processURLString(this.URLString, true);
        }
        if (urlstring) {
            if (this.URLString.length) {
                this.URLString += this.argumentSeparator + urlstring;
            } else {
                this.URLString = urlstring;
            }
        }
        // prevents caching of URLString
        this.setVar("rndval", new Date().getTime());
        urlstringtemp = new Array();
        for (key in this.vars) {
            if (false == this.vars[key][1] && true == this.encodeURIString) {
                encoded = this.encVar(key, this.vars[key][0], true);
                delete this.vars[key];
                this.vars[encoded[0]] = Array(encoded[1], true);
                key = encoded[0];
            }
            urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
        }
        if (urlstring){
            this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
        } else {
            this.URLString += urlstringtemp.join(this.argumentSeparator);
        }
    }
    this.runResponse = function() {
        eval(this.response);
    }
    this.runAJAX = function(urlstring) {
        if (this.failed) {
            this.onFail();
        } else {
            this.createURLString(urlstring);
            if (this.element) {
                this.elementObj = document.getElementById(this.element);
            }
            if (this.xmlhttp) {
                var self = this;
                if (this.method == "GET") {
                    totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
                    this.xmlhttp.open(this.method, totalurlstring, true);
                } else {
                    this.xmlhttp.open(this.method, this.requestFile, true);
                    try {
                        this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
                    } catch (e) { }
                }
                this.xmlhttp.onreadystatechange = function() {
                    switch (self.xmlhttp.readyState) {
                        case 1:
                            self.onLoading();
                            break;
                        case 2:
                            self.onLoaded();
                            break;
                        case 3:
                            self.onInteractive();
                            break;
                        case 4:
                            self.response = self.xmlhttp.responseText;
                            self.responseXML = self.xmlhttp.responseXML;
                            self.responseStatus[0] = self.xmlhttp.status;
                            self.responseStatus[1] = self.xmlhttp.statusText;
                            if (self.execute) {
                                self.runResponse();
                            }
                            if (self.elementObj) {
                                elemNodeName = self.elementObj.nodeName;
                                elemNodeName.toLowerCase();
                                if (elemNodeName == "input"
                                || elemNodeName == "select"
                                || elemNodeName == "option"
                                || elemNodeName == "textarea") {
                                    self.elementObj.value = self.response;
                                } else {
                                    self.elementObj.innerHTML = self.response;
                                }
                            }
                            if (self.responseStatus[0] == "200") {
                                self.onCompletion();
                            } else {
                                self.onError();
                            }
                            self.URLString = "";
                            break;
                    }
                };
                this.xmlhttp.send(this.URLString);
            }
        }
    };
    this.reset();
    this.createAJAX();
}