expertiza/expertiza

var ddajaxtabssettings={}
ddajaxtabssettings.bustcachevar=1  //bust potential caching of external pages after initial request? (1=yes, 0=no)
ddajaxtabssettings.loadstatustext="<img src='/assets/loading.gif' /> Requesting content..." 




function ddajaxtabs(tabinterfaceid, contentdivid){
    this.tabinterfaceid=tabinterfaceid //ID of Tab Menu main container
    this.tabs=document.getElementById(tabinterfaceid).getElementsByTagName("a") //Get all tab links within container
    this.enabletabpersistence=true
    this.hottabspositions=[] //Array to store position of tabs that have a "rel" attr defined, relative to all tab links, within container
    this.currentTabIndex=0 //Index of currently selected hot tab (tab with sub content) within hottabspositions[] array
    this.contentdivid=contentdivid
    this.defaultHTML=""
    this.defaultIframe='<iframe src="about:blank" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" class="tabcontentiframe" style="width:100%; height:auto; min-height: 100px"></iframe>'
    this.defaultIframe=this.defaultIframe.replace(/<iframe/i, '<iframe name="'+"_ddajaxtabsiframe-"+contentdivid+'" ')
this.revcontentids=[] //Array to store ids of arbitrary contents to expand/contact as well ("rev" attr values)
    this.selectedClassTarget="link" //keyword to indicate which target element to assign "selected" CSS class ("linkparent" or "link")
}

ddajaxtabs.connect=function(pageurl, tabinstance){
    var page_request = false
    var bustcacheparameter=""
    if (window.ActiveXObject){ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
        try {
        page_request = new ActiveXObject("Msxml2.XMLHTTP")
        } 
        catch (e){
            try{
            page_request = new ActiveXObject("Microsoft.XMLHTTP")
            }
            catch (e){}
        }
    }
    else if (window.XMLHttpRequest) // if Mozilla, Safari etc
        page_request = new XMLHttpRequest()
    else
        return false
    var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/") 
    page_request.onreadystatechange=function(){ddajaxtabs.loadpage(page_request, pageurl, tabinstance)}
    if (ddajaxtabssettings.bustcachevar) //if bust caching of external page
        bustcacheparameter=(ajaxfriendlyurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
    page_request.open('GET', ajaxfriendlyurl+bustcacheparameter, true)
    page_request.send(null)
}

ddajaxtabs.loadpage=function(page_request, pageurl, tabinstance){
    var divId=tabinstance.contentdivid
    document.getElementById(divId).innerHTML=ddajaxtabssettings.loadstatustext //Display "fetching page message"
    if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
        document.getElementById(divId).innerHTML=page_request.responseText
        ddajaxtabs.ajaxpageloadaction(pageurl, tabinstance)
    }
}

ddajaxtabs.ajaxpageloadaction=function(pageurl, tabinstance){
    tabinstance.onajaxpageload(pageurl) //call user customized onajaxpageload() function when an ajax page is fetched/ loaded
}

ddajaxtabs.getCookie=function(Name){ 
    var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
    if (document.cookie.match(re)) //if cookie found
        return document.cookie.match(re)[0].split("=")[1] //return its value
    return ""
}

ddajaxtabs.setCookie=function(name, value){
    document.cookie = name+"="+value+";path=/" //cookie value is domain wide (path=/)
}

ddajaxtabs.prototype={

    expandit:function(tabid_or_position){ //PUBLIC function to select a tab either by its ID or position(int) within its peers
        this.cancelautorun() //stop auto cycling of tabs (if running)
        var tabref=""
        try{
            if (typeof tabid_or_position=="string" && document.getElementById(tabid_or_position).getAttribute("rel")) //if specified tab contains "rel" attr
                tabref=document.getElementById(tabid_or_position)
            else if (parseInt(tabid_or_position)!=NaN && this.tabs[tabid_or_position].getAttribute("rel")) //if specified tab contains "rel" attr
                tabref=this.tabs[tabid_or_position]
        }
        catch(err){alert("Invalid Tab ID or position entered!")}
        if (tabref!="") //if a valid tab is found based on function parameter
            this.expandtab(tabref) //expand this tab
    },

    cycleit:function(dir, autorun){ //PUBLIC function to move forward or backwards through each hot tab (tabinstance.cycleit('foward/back') )
        if (dir=="next"){
            var currentTabIndex=(this.currentTabIndex<this.hottabspositions.length-1)? this.currentTabIndex+1 : 0
        }
        else if (dir=="prev"){
            var currentTabIndex=(this.currentTabIndex>0)? this.currentTabIndex-1 : this.hottabspositions.length-1
        }
        if (typeof autorun=="undefined") //if cycleit() is being called by user, versus autorun() function
            this.cancelautorun() //stop auto cycling of tabs (if running)
        this.expandtab(this.tabs[this.hottabspositions[currentTabIndex]])
    },

    setpersist:function(bool){ //PUBLIC function to toggle persistence feature
            this.enabletabpersistence=bool
    },

    loadajaxpage:function(pageurl){ //PUBLIC function to fetch a page via Ajax and display it within the Tab Content instance's container
        ddajaxtabs.connect(pageurl, this)
    },

    loadiframepage:function(pageurl){ //PUBLIC function to fetch a page and load it into the IFRAME of the Tab Content instance's container
        this.iframedisplay(pageurl, this.contentdivid)
    },

    setselectedClassTarget:function(objstr){ //PUBLIC function to set which target element to assign "selected" CSS class ("linkparent" or "link")
        this.selectedClassTarget=objstr || "link"
    },

    getselectedClassTarget:function(tabref){ //Returns target element to assign "selected" CSS class to
        return (this.selectedClassTarget==("linkparent".toLowerCase()))? tabref.parentNode : tabref
    },

    urlparamselect:function(tabinterfaceid){
        var result=window.location.search.match(new RegExp(tabinterfaceid+"=(\\d+)", "i")) //check for "?tabinterfaceid=2" in URL
        return (result==null)? null : parseInt(RegExp.$1) //returns null or index, where index (int) is the selected tab's index
    },

    onajaxpageload:function(pageurl){ //PUBLIC Event handler that can invoke custom code whenever an Ajax page has been fetched and displayed
        //do nothing by default
    },

    expandtab:function(tabref){
        var relattrvalue=tabref.getAttribute("rel")
        //Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easy searching through
        var associatedrevids=(tabref.getAttribute("rev"))? ","+tabref.getAttribute("rev").replace(/\s+/, "")+"," : ""
        if (relattrvalue=="#default")
            document.getElementById(this.contentdivid).innerHTML=this.defaultHTML
        else if (relattrvalue=="#iframe")
            this.iframedisplay(tabref.getAttribute("href"), this.contentdivid)
        else
            ddajaxtabs.connect(tabref.getAttribute("href"), this)
        this.expandrevcontent(associatedrevids)
        for (var i=0; i<this.tabs.length; i++){ //Loop through all tabs, and assign only the selected tab the CSS class "selected"
            this.getselectedClassTarget(this.tabs[i]).className=(this.tabs[i].getAttribute("href")==tabref.getAttribute("href"))? "selected" : ""
        }
        if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers
            ddajaxtabs.setCookie(this.tabinterfaceid, tabref.tabposition)
        this.setcurrenttabindex(tabref.tabposition) //remember position of selected tab within hottabspositions[] array
    },

    iframedisplay:function(pageurl, contentdivid){
        if (typeof window.frames["_ddajaxtabsiframe-"+contentdivid]!="undefined"){
            try{delete window.frames["_ddajaxtabsiframe-"+contentdivid]} //delete iframe within Tab content container if it exists (due to bug in Firefox)
            catch(err){}
        }
        document.getElementById(contentdivid).innerHTML=this.defaultIframe
        window.frames["_ddajaxtabsiframe-"+contentdivid].location.replace(pageurl) //load desired page into iframe
    },


    expandrevcontent:function(associatedrevids){
        var allrevids=this.revcontentids
        for (var i=0; i<allrevids.length; i++){ //Loop through rev attributes for all tabs in this tab interface
            //if any values stored within associatedrevids matches one within allrevids, expand that DIV, otherwise, contract it
            document.getElementById(allrevids[i]).style.display=(associatedrevids.indexOf(","+allrevids[i]+",")!=-1)? "block" : "none"
        }
    },

    setcurrenttabindex:function(tabposition){ //store current position of tab (within hottabspositions[] array)
        for (var i=0; i<this.hottabspositions.length; i++){
            if (tabposition==this.hottabspositions[i]){
                this.currentTabIndex=i
                break
            }
        }
    },

    autorun:function(){ //function to auto cycle through and select tabs based on a set interval
        this.cycleit('next', true)
    },

    cancelautorun:function(){
        if (typeof this.autoruntimer!="undefined")
            clearInterval(this.autoruntimer)
    },

    init:function(automodeperiod){
        var persistedtab=ddajaxtabs.getCookie(this.tabinterfaceid) //get position of persisted tab (applicable if persistence is enabled)
        var selectedtab=-1 //Currently selected tab index (-1 meaning none)
        var selectedtabfromurl=this.urlparamselect(this.tabinterfaceid) //returns null or index from: tabcontent.htm?tabinterfaceid=index
        this.automodeperiod=automodeperiod || 0
        this.defaultHTML=document.getElementById(this.contentdivid).innerHTML
        for (var i=0; i<this.tabs.length; i++){
            this.tabs[i].tabposition=i //remember position of tab relative to its peers
            if (this.tabs[i].getAttribute("rel")){
                var tabinstance=this
                this.hottabspositions[this.hottabspositions.length]=i //store position of "hot" tab ("rel" attr defined) relative to its peers
                this.tabs[i].onclick=function(){
                    tabinstance.expandtab(this)
                    tabinstance.cancelautorun() //stop auto cycling of tabs (if running)
                    return false
                }
                if (this.tabs[i].getAttribute("rev")){ //if "rev" attr defined, store each value within "rev" as an array element
                    this.revcontentids=this.revcontentids.concat(this.tabs[i].getAttribute("rev").split(/\s*,\s*/))
                }
                if (selectedtabfromurl==i || this.enabletabpersistence && selectedtab==-1 && parseInt(persistedtab)==i || !this.enabletabpersistence && selectedtab==-1 && this.getselectedClassTarget(this.tabs[i]).className=="selected"){
                    selectedtab=i //Selected tab index, if found
                }
            }
        } //END for loop
        if (selectedtab!=-1) //if a valid default selected tab index is found
            this.expandtab(this.tabs[selectedtab]) //expand selected tab (either from URL parameter, persistent feature, or class="selected" class)
        else //if no valid default selected index found
            this.expandtab(this.tabs[this.hottabspositions[0]]) //Just select first tab that contains a "rel" attr
        if (parseInt(this.automodeperiod)>500 && this.hottabspositions.length>1){
            this.autoruntimer=setInterval(function(){tabinstance.autorun()}, this.automodeperiod)
        }
    } //END int() function

} //END Prototype assignment