// ********************************************************************************************
// Expanding Tree Menu - Memory System
// This add-in keeps expanded menu sections open between pages via a cookie.
// To be used with the Expanding Tree menu from opencube.com
// Copyright 2006 Devin Breen (dbreen@westmonroepartners.com)
//
// USAGE INSTRUCTIONS
// 1. In order for this code to work, each LI tag in the menu that expands must have 
//    an ID value set.  Ensure this is so.
// 
// 2. You must insert the following lines of code:
//
//    /* ****************************************************************** */
//    // REQUIRED for Expanded Menu Memory add-in
//    // This code sets an onClick action for every normal link in the system.
//    if (this.cc13[this.ti].tagName == "A") {
//        this.cc13[this.ti].onclick = saveExpandedItemsToCookie;
//    }
//    /* ****************************************************************** */
//
// directy after the following section of the source code block:
//
//    this.cc13[this.ti].onmouseout=function(){this.className="";};}}
//
// 3. Call this JavaScript file AFTER the menu is defined and BEFORE the expanding menu
//    source code is called.
//
// ********************************************************************************************


// Open the containing LI for the next menu load.
function openContainingLI() {
    var parentLI = this.parentNode.parentNode;        //ERC - Had to add this since out A href is in a DIV
    parentLI.setAttribute("expanded", 1);
    saveExpandedItemsToCookie();
}


// Save all expanded menu items to a cookie
function saveExpandedItemsToCookie() {
    var delimiter = '|';
    var cookieString = '';
    
    // Gather all of the LI elements within this page.
    arrayLI = document.getElementsByTagName("LI");
    
    // For each LI element, see if it has an expanded attribute set to 1.
    for (i = 0; i < arrayLI.length; i++) {
        // If the element is equal to 1, add it to the pipe-delimited string.
        if ((expandedVal = arrayLI[i].getAttribute("expanded")) && (parseInt(expandedVal))) {
            if (cookieString.length != 0) {
                cookieString += delimiter;
            }
            cookieString += arrayLI[i].id;
        }
    }

    // If the cookieString has a value in it, write a cookie that lasts for 1 day.
    if (cookieString.length > 0) {
        createCookie('expandedMenu', cookieString, 1);
    // Otherwise, delete the cookie.
    } else {
        eraseCookie('expandedMenu');
    }
}


// ********************************************************************************************
// Read and parse all expanded menu items saved within a cookie.
// Set the appropriate LI tags to expanded=1.
function readExpandedItemsFromCookie() {
    var delimiter = '|';
    var arrExpandedItems;
    var strExpandedItems = readCookie('expandedMenu');
    // If the cookie exists, then expand the values into an array.
    if (strExpandedItems) {
        arrExpandedItems = strExpandedItems.split(delimiter);
        // For each expanded menu item (who has an id length > 0), find the appropriate LI tag and set expanded = 1.
        for (i = 0; i < arrExpandedItems.length; i++) {
            if (arrExpandedItems[i].length > 0) {
                currentLI = document.getElementById(arrExpandedItems[i]);
                if (currentLI != null) {
                    currentLI.setAttribute("expanded", 1);
                }
            }
        }
    }
}


// ********************************************************************************************
// This actually loads the data from the cookie, and is the 
// only code that is run automatically from this page.
readExpandedItemsFromCookie();


// ********************************************************************************************
// Cookie Utility Functions.
// Used from the website: http://www.quirksmode.org/js/cookies.html
// ********************************************************************************************
// Create a cookie
function createCookie(name,value,days)
{
    if (days)
    {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}


// Read a cookie
function readCookie(name)
{
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++)
    {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}


// Erase a cookie
function eraseCookie(name)
{
    createCookie(name,"",-1);
}


// ********************************************************************************************
// EOF