// Ajax Voting Script - http://coursesweb.net
var ivotings = Array(); // store the items with voting
var ar_elm = Array(); // store the items that will be send to votAjax()
var i_elm = 0; // Index for elements aded in ar_elm
var itemvotin = ''; // store the voting of voted item
var votingfiles = 'votingfiles/'; // directory with files for script
var advote = 0; // variable checked in addVote(), if is 0 cann vote, else, not
// gets all DIVs, store in $ivotings, and in $ar_elm DIVs with class: "vot_plus", "vot_updown", and ID="vt_..", sends to votAjax()
var getVotsElm = function () {
var obj_div = document.getElementsByTagName('div');
var nrobj_div = obj_div.length;
for(var i=0; i<nrobj_div; i++) {
// if contains class and id
if(obj_div[i].className && obj_div[i].id) {
var elm_id = obj_div[i].id;
// if class "vot_plus", "vot_updown1", "vot_updown2", or "vot_poll" and id begins with "vt_"
if((obj_div[i].className=='vot_plus' || obj_div[i].className=='vot_updown1' || obj_div[i].className=='vot_updown2') && elm_id.indexOf("vt_")==0) {
ivotings[elm_id] = obj_div[i]; // store object item in $ivotings
ar_elm[i_elm] = elm_id; // add item_ID in $ar_elm array, to be send in json string tp php
i_elm++; // index order in $ar_elm
}
}
}
// if there are elements in "ar_elm", send them to votAjax()
if(ar_elm.length>0) votAjax(ar_elm, ''); // if items in $ar_elm pass them to votAjax()
};
// add the ratting data to element in page
function addVotData(elm_id, vote, nvotes, renot) {
// exists elm_id stored in ivotings
if(ivotings[elm_id]) {
// sets to add "onclick" for vote up (plus), if renot is 0
var clik_up = (renot == 0) ? ' onclick="addVote(this, 1)"' : ' onclick="alert(\'You already voted\')"';
// if vot_plus, add code with <img> 'votplus', else, if vot_updown1/2, add code with <img> 'votup', 'votdown'
if(ivotings[elm_id].className == 'vot_plus') { // simple vote
ivotings[elm_id].innerHTML = '<h4>'+ vote+ '</h4><span><img src="'+votingfiles+'votplus.gif" alt="1" title="Vote"'+ clik_up+ '/></span>';
}
else if(ivotings[elm_id].className=='vot_updown1') { // up/down with total Votes
// sets to add "onclick" for vote down (minus), if renot is 0
var clik_down = (renot == 0) ? ' onclick="addVote(this, -1)"' : ' onclick="alert(\'You already voted\')"';
ivotings[elm_id].innerHTML = '<div id="nvotes">Votes: <b>'+ nvotes+ '</b></div><h4>'+ vote+ '</h4><span><img src="'+votingfiles+'votup.png" alt="Vote Up" title="Vote Up"'+ clik_up+ '/> <img src="'+votingfiles+'votdown.png" alt="Vote Down" title="Vote Down"'+ clik_down+ '/></span>';
}
else if(ivotings[elm_id].className=='vot_updown2') { // up/down with number of votes up and down
var nvup = (nvotes*1 + vote*1) /2; // number of votes up
var nvdown = nvotes - nvup; // number of votes down
// sets to add "onclick" for vote down (minus), if renot is 0
var clik_down = (renot == 0) ? ' onclick="addVote(this, -1)"' : ' onclick="alert(\'You already voted\')"';
ivotings[elm_id].innerHTML = '<h4>'+ vote+ '</h4><span><img src="'+votingfiles+'votup.png" alt="Vote Up" title="Vote Up"'+ clik_up+ '/> <img src="'+votingfiles+'votdown.png" alt="Vote Down" title="Vote Down"'+ clik_down+ '/></span><div id="nupdown"><b id="nvup">'+ nvup+ '</b> <b id="nvdown">'+ nvdown+ '</b></div>';
}
}
}
// Sends data to votAjax(), that will be send to PHP to register the vote
function addVote(ivot, vote) {
// if $advote is 0, can vote, else, alert message
if(advote == 0) {
var elm = Array();
elm[0] = ivot.parentNode.parentNode.id; // gets the item-name that will be voted
ivot.parentNode.innerHTML = '<i><b>Thanks</b></i>';
votAjax(elm, vote);
}
else alert('You already voted');
}
/*** Ajax ***/
// create the XMLHttpRequest object, according to browser
function get_XmlHttp() {
var xmlHttp = null; // will stere and return the XMLHttpRequest
if(window.XMLHttpRequest) xmlHttp = new XMLHttpRequest(); // Forefox, Opera, Safari, ...
else if(window.ActiveXObject) xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); // IE
return xmlHttp;
}
// sends data to PHP and receives the response
function votAjax(elm, vote) {
var cerere_http = get_XmlHttp(); // get XMLHttpRequest object
// define data to be send via POST to PHP (Array with name=value pairs)
var datasend = Array();
for(var i=0; i<elm.length; i++) datasend[i] = 'elm[]='+elm[i];
// joins the array items into a string, separated by '&'
datasend = datasend.join('&')+'&vote='+vote;
cerere_http.open("POST", votingfiles+'voting.php', true); // crate the request
cerere_http.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); // header for POST
cerere_http.send(datasend); // make the ajax request, poassing the data
// checks and receives the response
cerere_http.onreadystatechange = function() {
if (cerere_http.readyState == 4) {
// receives a JSON with one or more item:[vote, nvotes, renot]
eval("var jsonitems = "+ cerere_http.responseText);
// if jsonitems is defined variable
if (jsonitems) {
// parse the jsonitems object
for(var votitem in jsonitems) {
var renot = jsonitems[votitem][2]; // determine if the user can vote or not
// if renot=3 displays alert that already voted, else, continue with the voting reactualization
if(renot == 3) {
alert("You already voted \n You can vote again tomorrow");
window.location.reload(true); // Reload the page
}
else addVotData(votitem, jsonitems[votitem][0], jsonitems[votitem][1], renot); // calls function that shows voting
}
}
// if renot is undefined or 2 (set to 1 NRVOT in voting.php), after vote, set $advote to 1
if(vote != '' && (renot == undefined || renot == 2)) advote = 1;
}
}
}
// this function is used to access the function we need after loading page
function addLoadVote(func) {
var oldonload = window.onload;
// if the parameter is a function, calls it with "onload"
// otherwise, adds the parameter into a function, and then call it
if (typeof window.onload != 'function') window.onload = func;
else {
window.onload = function() {
if (oldonload) { oldonload(); }
func();
}
}
}
addLoadVote(getVotsElm); // calls getVotsElm() after page loads
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