//** Tab Content script v2.0- � Dynamic Drive DHTML code library (http://www.dynamicdrive.com)

//** Updated Oct 7th, 07 to version 2.0. Contains numerous improvements:

//   -Added Auto Mode: Script auto rotates the tabs based on an interval, until a tab is explicitly selected

//   -Ability to expand/contract arbitrary DIVs on the page as the tabbed content is expanded/ contracted

//   -Ability to dynamically select a tab either based on its position within its peers, or its ID attribute (give the target tab one 1st)

//   -Ability to set where the CSS classname "selected" get assigned- either to the target tab's link ("A"), or its parent container 



////NO NEED TO EDIT BELOW////////////////////////



function ddtabcontent(tabinterfaceid) {

    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.subcontentids = [] //Array to store ids of the sub contents ("rel" attr values)

    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")

}



ddtabcontent.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 ""

}



ddtabcontent.setCookie = function(name, value) {

    document.cookie = name + "=" + value + ";path=/" //cookie value is domain wide (path=/)

}



ddtabcontent.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

    },



    setpersist: function(bool) { //PUBLIC function to toggle persistence feature

        this.enabletabpersistence = bool

    },



    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

    },



    expandtab: function(tabref) {

        var subcontentid = tabref.getAttribute("rel") //Get id of subcontent to expand

        //Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easily search through

        var associatedrevids = (tabref.getAttribute("rev")) ? "," + tabref.getAttribute("rev").replace(/\s+/, "") + "," : ""

        this.expandsubcontent(subcontentid)

        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("rel") == subcontentid) ? "selected" : ""

        }

        if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers

            ddtabcontent.setCookie(this.tabinterfaceid, tabref.tabposition)

    },



    expandsubcontent: function(subcontentid) {

        for (var i = 0; i < this.subcontentids.length; i++) {

            var subcontent = document.getElementById(this.subcontentids[i]) //cache current subcontent obj (in for loop)

            subcontent.style.display = (subcontent.id == subcontentid) ? "block" : "none" //"show" or hide sub content based on matching id attr value

        }

    },





    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"

        }

    },



    autorun: function() { //function to auto cycle through and select tabs based on a set interval

        var currentTabIndex = this.automode_currentTabIndex //index within this.hottabspositions to begin

        var hottabspositions = this.hottabspositions //Array containing position numbers of "hot" tabs (those with a "rel" attr)

        this.expandtab(this.tabs[hottabspositions[currentTabIndex]])

        this.automode_currentTabIndex = (currentTabIndex < hottabspositions.length - 1) ? currentTabIndex + 1 : 0 //increment currentTabIndex

    },



    cancelautorun: function() {

        if (typeof this.autoruntimer != "undefined")

            clearInterval(this.autoruntimer)

    },



    init: function(automodeperiod) {

        var persistedtab = ddtabcontent.getCookie(this.tabinterfaceid) //get position of persisted tab (applicable if persistence is enabled)

        var persisterror = true //Bool variable to check whether persisted tab position is valid (can become invalid if user has modified tab structure)

        this.automodeperiod = automodeperiod || 0

        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.subcontentids[this.subcontentids.length] = this.tabs[i].getAttribute("rel") //store id of sub content ("rel" attr value)

                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 (this.enabletabpersistence && parseInt(persistedtab) == i || !this.enabletabpersistence && this.getselectedClassTarget(this.tabs[i]).className == "selected") {

                    this.expandtab(this.tabs[i]) //expand current tab if it's the persisted tab, or if persist=off, carries the "selected" CSS class

                    persisterror = false //Persisted tab (if applicable) was found, so set "persisterror" to false

                    //If currently selected tab's index(i) is greater than 0, this means its not the 1st tab, so set the tab to begin in automode to 1st tab:

                    this.automode_currentTabIndex = (i > 0) ? 0 : 1

                }

            }

        } //END for loop

        if (persisterror) //if an error has occured while trying to retrieve persisted tab (based on its position within its peers)

            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.automode_currentTabIndex = this.automode_currentTabIndex || 0

            this.autoruntimer = setInterval(function() { tabinstance.autorun() }, this.automodeperiod)

        }

    } //END int() function



} //END Prototype assignment