var xmlHttpYalp;
var dataYalp;
var pageCurr = 1;
var pageTot;
var rowsListing = 3;
var totRecord;

function getXMLHttpRequestYalp()
{
	try{
		return new XMLHttpRequest();
	   }catch(e){}
       	try{
        	return new ActiveXObject('Msxm12.XMLHTTP');
           }catch(e){}
       	try{
		return new ActiveXObject('Microsoft.XMLHTTP');
           }catch(e){}
}

function loadYalp()
{

	xmlHttpYalp = getXMLHttpRequestYalp();
 	if (xmlHttpYalp)
        {
        	xmlHttpYalp.onreadystatechange = gestioneRichiestaYalp;
 		xmlHttpYalp.open("GET", urlYalp + '?rnd=' + Math.floor(1000000 * Math.random()), true);
 		xmlHttpYalp.send(null);
        }
 	else
 		document.getElementById("yalp").style.display = "none";
}

function gestioneRichiestaYalp()
{
    try{
	    if (xmlHttpYalp.readyState == 4)
	    {
		    if (xmlHttpYalp.status == 200)
		    {
			    var objYalp = eval("(" + xmlHttpYalp.responseText + ")");
			    dataYalp = objYalp.yalp;
			    if (dataYalp)
			    {
				    setNumPages();
				    displayListYalp();
			    }
			    else
				    document.getElementById("yalp").style.display = "none";
		    }
	    }
	}
	catch(e){}
}

function setNumPages()
{
	totRecord = dataYalp.length;
        pageTot = 0;
        if (totRecord > 0)
        {
            pageTot = Math.floor(totRecord / rowsListing);
	    var resto = totRecord % rowsListing;
	    if (resto > 0)
               	pageTot = pageTot + 1;
	}
}

function displayListYalp()
{
	document.getElementById("yalpContent").innerHTML = "";
	
	createPaginationListingYalp();
	
        var startPosition = (pageCurr - 1) * rowsListing;
        var endPosition = pageCurr * rowsListing;
        for (var k=startPosition;k<endPosition;k++)
	{
            if (dataYalp[k] == null)
		break;
	    createYalpDetail(dataYalp[k]);
        }
}

function createYalpDetail(objElement)
{
	  var strElement = "";
	  
	  if (objElement.periodo)
		strElement = strElement + '<span class="data">' + objElement.periodo + '</span>';
	  else
		strElement = strElement + '<span class="data">&nbsp</span>';
		
	  var link = objElement.url;
	  if (!objElement.url)
	  	link = "";
	  
	  if (objElement.img)
	  	strElement = strElement + '<a href="'+ link +'"><img src="'+ objElement.img +'" alt="" /></a>';
	  		
	  strElement = strElement + '<p><a href="'+ link +'">';
	  
	  if (objElement.orario)
		strElement = strElement + '<span class="ora">'+ objElement.orario +'</span>';
		
	  if (objElement.titolo)
		strElement = strElement + objElement.titolo ;
	  
	  strElement = strElement + '</a></p>';
	 
       	  var externalDiv = document.createElement("DIV");
          externalDiv.className= "box";
      
          externalDiv.innerHTML = strElement;
	  document.getElementById("yalpContent").appendChild(externalDiv);
}

function goPage(nPage)
{
    pageCurr = nPage;
    displayListYalp();
}

function createPaginationListingYalp()
{
        var strPagination = "";
        var strAvanti = "";
        var strIndietro = "";
        var inizio = 1;
        var fine = 1;
        
        if (pageCurr > 3)
        {
        	if (pageTot > 5)
        		inizio = pageCurr - 2;
            
                if (pageTot < (pageCurr + 2))
            	{
            		fine = pageTot;
                	inizio = fine - 4;
            	}
            	else
	    		fine = pageCurr + 2;
        }
	else 
	{
	        if (pageTot > 5)
	            fine = 5;
	        else
	            fine = pageTot;
	}
	if (inizio < 1)
		inizio = 1;
	    
        for (k=inizio;k<=fine;k++)
        {
            if (k != inizio)
                strPagination = strPagination + " ";
            if (k == pageCurr)
                strPagination = strPagination + k;
            else
                strPagination = strPagination + "<a href='javascript:goPage(" + k + ")'>" + k + "</a>";
        }
        
        if (pageTot > 5 && pageCurr < pageTot)
        	strAvanti = "<div class='prev'><a href='javascript:goPage(" + (parseInt(pageCurr) + 1) + ")'><img src='/images/yalp_next.gif' alt=''></a></div>";
               
        if (pageTot > 5 && pageCurr > 1)
            	strIndietro = "<div class='next'><a href='javascript:goPage(" + (parseInt(pageCurr) - 1) + ")'><img src='/images/yalp_prev.gif' alt=''></a></div>";
	        						
	strPagination = strPagination + strAvanti + strIndietro;
	if (pageTot<=1)
	    document.getElementById("yalpPagination").style.display="none";
	else
      	document.getElementById("yalpPagination").innerHTML = strPagination;
}


/* Funzione eseguita al caricamento della pagina */
addEventYalp(window, 'load', loadYalp); 

function addEventYalp(obj, evType, fn)
{ 
	if (obj.addEventListener)
	{ 
		obj.addEventListener(evType, fn, true); 
		return true; 
 	}
 	else
 	if (obj.attachEvent)
 	{ 
    		var r = obj.attachEvent("on"+evType, fn); 
    		return r; 
 	}
 	else
    		return false; 
}