/***********************************************
* Virtual Pagination script- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/

function virtualpaginate(className, chunksize, elementType)
{
    //The type of element used to divide up content into pieces. Defaults to "div"
    var elementType=(typeof elementType=="undefined")? "div" : elementType 
    //Get total number of divs matching class name
    this.pieces = virtualpaginate.collectElementbyClass(className, elementType)
    //Set this.chunksize: 1 if "chunksize" param is undefined, "chunksize" if it's less than total pieces available, or simply total pieces avail (show all)
    this.chunksize = (typeof chunksize=="undefined") ? 1 : (chunksize > 0 && chunksize <this.pieces.length) ? chunksize : this.pieces.length
    this.pagecount=Math.ceil(this.pieces.length/this.chunksize) //calculate number of "pages" needed to show the divs
    this.showpage(-1) //show no pages (aka hide all)
    this.currentpage=0 //Having hidden all pages, set currently visible page to 1st page
    this.showpage(this.currentpage) //Show first page
}

// -------------------------------------------------------------------
// PRIVATE: collectElementbyClass(classname)- Returns an array containing DIVs with the specified classname
// -------------------------------------------------------------------
//Returns an array containing DIVs with specified classname
virtualpaginate.collectElementbyClass=function(classname, element)
{
    //regular expression to screen for classname within element
    var classnameRE=new RegExp("(^|\\s+)"+classname+"($|\\s+)", "i")
    var pieces=[]
    var alltags=document.getElementsByTagName(element)
    for (var i=0; i<alltags.length; i++)
    {
        if (typeof alltags[i].className=="string" && alltags[i].className.search(classnameRE)!=-1)
        pieces[pieces.length]=alltags[i]
    }
    return pieces
}

// -------------------------------------------------------------------
// PUBLIC: showpage(pagenumber)- Shows a page based on parameter passed (0=page1, 1=page2 etc)
// -------------------------------------------------------------------

virtualpaginate.prototype.showpage=function(pagenumber)
{
    var totalitems=this.pieces.length //total number of broken up divs
    var showstartindex=pagenumber*this.chunksize //array index of div to start showing per pagenumber setting
    var showendindex=showstartindex+this.chunksize-1 //array index of div to stop showing after per pagenumber setting
    for (var i=0; i<totalitems; i++)
    {
        if (i>=showstartindex && i<=showendindex)
        this.pieces[i].style.display="block"
    else
        this.pieces[i].style.display="none"
    }
    this.currentpage=parseInt(pagenumber)
    if (this.cpspan) //if <span class="paginateinfo> element is present, update it with the most current info (ie: Page 3/4)
    this.cpspan.innerHTML='Page '+(this.currentpage+1)+'/'+this.pagecount
}

// -------------------------------------------------------------------
// PRIVATE: paginate_build_() methods- Various methods to create pagination interfaces
// paginate_build_selectmenu(paginatedropdown)- Accepts an empty SELECT element and turns it into pagination menu
// paginate_build_regularlinks(paginatelinks)- Accepts a collection of links and screens out/ creates pagination out of ones with specific "rel" attr
// paginate_build_flatview(flatviewcontainer)- Accepts <span class="flatview"> element and replaces it with sequential pagination links
// paginate_build_cpinfo(cpspan)- Accepts <span class="paginateinfo"> element and displays current page info (ie: Page 1/4)
// -------------------------------------------------------------------

virtualpaginate.prototype.paginate_build_selectmenu=function(paginatedropdown, anchortext)
{
    var instanceOfBox=this
    var anchortext=anchortext || new Array()
    this.selectmenupresent=1
    for (var i=0; i<this.pagecount; i++)
    {
        //if custom anchor text for this link exists, use anchor text as each OPTION's text
        if (typeof anchortext[i]!="undefined") paginatedropdown.options[i]=new Option(anchortext[i], i)
        else //else, use auto incremented, sequential numbers
            paginatedropdown.options[i]=new Option("Page "+(i+1)+" of "+this.pagecount, i)
    }
    paginatedropdown.selectedIndex=this.currentpage
    paginatedropdown.onchange=function()
    {
        instanceOfBox.showpage(this.selectedIndex)
    }
}

virtualpaginate.prototype.paginate_build_regularlinks=function(paginatelinks)
{
    var instanceOfBox=this
    for (var i=0; i<paginatelinks.length; i++)
    {
        var currentpagerel=paginatelinks[i].getAttribute("rel")
        //screen for these "rel" values
        if (currentpagerel=="previous" || currentpagerel=="next" || currentpagerel=="first" || currentpagerel=="last")paginatelinks[i].onclick=function()
        {
            instanceOfBox.navigate(this.getAttribute("rel"))
            return false
        }
    }
}

virtualpaginate.prototype.paginate_build_flatview=function(flatviewcontainer, anchortext)
{
    var instanceOfBox=this
    var flatviewhtml=""
    var anchortext=anchortext || new Array()
    for (var i=0; i<this.pagecount; i++)
    {
        if (typeof anchortext[i]!="undefined") //if custom anchor text for this link exists
            flatviewhtml+='<a href="#flatview" rel="'+i+'">'+anchortext[i]+'</a> ' //build pagination link using custom anchor text
        else
            flatviewhtml+='<a href="#flatview" rel="'+i+'">'+(i+1)+'</a> ' //build  pagination link using auto incremented sequential number instead
    }
    flatviewcontainer.innerHTML=flatviewhtml
    this.flatviewlinks=flatviewcontainer.getElementsByTagName("a")
    for (var i=0; i<this.flatviewlinks.length; i++)
    {
        this.flatviewlinks[i].onclick=function()
        {
            instanceOfBox.flatviewlinks[instanceOfBox.currentpage].className="" //"Unhighlight" last flatview link clicked on
            this.className="selected" //while "highlighting" currently clicked flatview link (set its class name to "selected"
            instanceOfBox.showpage(this.getAttribute("rel"))
            return false
        }
    }
    this.flatviewlinks[this.currentpage].className="selected" //"Highlight" current page
    this.flatviewpresent=true //indicate flat view links are present
}

virtualpaginate.prototype.paginate_build_cpinfo=function(cpspan)
{
    this.cpspan=cpspan
    cpspan.innerHTML='Page '+(this.currentpage+1)+'/'+this.pagecount
}


// -------------------------------------------------------------------
// PRIVATE: buildpagination()- Create pagination interface by calling one or more of the paginate_build_() functions
// -------------------------------------------------------------------

virtualpaginate.prototype.buildpagination=function(divid, optnavtext)
{
    var instanceOfBox=this
    var paginatediv=document.getElementById(divid)
    if (this.chunksize==this.pieces.length) //if user has set to display all pieces at once, don't create pagination div
    {
        paginatediv.style.display="none"
        return
    }
    var paginationcode=paginatediv.innerHTML //Get user defined, "unprocessed" HTML within paginate div
    if (paginatediv.getElementsByTagName("select").length>0) //if there's a select menu in div
        this.paginate_build_selectmenu(paginatediv.getElementsByTagName("select")[0], optnavtext)
    if (paginatediv.getElementsByTagName("a").length>0) //if there are links defined in div
        this.paginate_build_regularlinks(paginatediv.getElementsByTagName("a"))
    var allspans=paginatediv.getElementsByTagName("span") //Look for span tags within passed div
    for (var i=0; i<allspans.length; i++)
    {
        if (allspans[i].className=="flatview")
        this.paginate_build_flatview(allspans[i], optnavtext)
        else if (allspans[i].className=="paginateinfo")
        this.paginate_build_cpinfo(allspans[i])
    }
    this.paginatediv=paginatediv
}

// -------------------------------------------------------------------
// PRIVATE: navigate(keyword)- Calls this.showpage() with the currentpage property preset based on entered keyword
// -------------------------------------------------------------------

virtualpaginate.prototype.navigate=function(keyword)
{
    if (this.flatviewpresent)
        this.flatviewlinks[this.currentpage].className="" //"Unhighlight" previous page (before this.currentpage increments)
    if (keyword=="previous")
        this.currentpage=(this.currentpage>0)? this.currentpage-1 : (this.currentpage==0)? this.pagecount-1 : 0
    else if (keyword=="next")
    {
        this.currentpage=(this.currentpage<this.pagecount-1)? this.currentpage+1 : 0
        //document.getElementById("ctl00_ContentPlaceHolder1_imgSpotlight").style.display='none'
    }
    else if (keyword=="first")
        this.currentpage=0
    else if (keyword=="last")
        this.currentpage=this.pieces.length-1
    this.showpage(this.currentpage)
    if (this.selectmenupresent)
        this.paginatediv.getElementsByTagName("select")[0].selectedIndex=this.currentpage
    if (this.flatviewpresent)
        this.flatviewlinks[this.currentpage].className="selected" //"Highlight" current page
}
//End Virtual Pagination script