//** Ajax Tabs Content script v2.0- ?Dynamic Drive DHTML code library (http://www.dynamicdrive.com)
//** Updated Oct 21st, 07 to version 2.0. Contains numerous improvements
//** Updated Feb 18th, 08 to version 2.1: Adds a public "tabinstance.cycleit(dir)" method to cycle forward or backward between tabs dynamically. Only .js file changed from v2.0.
//** Updated April 8th, 08 to version 2.2:
//   -Adds support for expanding a tab using a URL parameter (ie: http://mysite.com/tabcontent.htm?tabinterfaceid=0) 
//   -Modified Ajax routine so testing the script out locally in IE7 now works 

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


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

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 foward 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].onmouseover = function() {
                    tabinstance.expandtab(this)
                    //tabinstance.cancelautorun() //stop auto cycling of tabs (if running)
                    return false
                }
                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