// jshop.js JavaScript

// ****Begin code section for catalog display****

// **Establish array variables. These must match the**
// **catalog array construction in each page.**

var catNo = new Array(); // The catalog number
var itemDesc = new Array(); // The item description
var price = new Array(); // The item price
var itemQty = new Array();

// ****Begin shared cookie functions****

// **Global expdate variable for cookies**
// **Cookie is set to expire in 24 hours**

var expdate = new Date();
expdate.setTime (expdate.getTime() + (7 * 24 * 60 * 60 * 1000))

// **Read cookie data.**

function getCookieData(name) {
	var label = name + "="
	var labelLen = label.length
	var cLen = document.cookie.length
	var i = 0
	while (i < cLen) {
		var j = i + labelLen
		if (document.cookie.substring(i,j) == label) {
			var cEnd = document.cookie.indexOf(";",j)
			if (cEnd == -1) {
				cEnd = document.cookie.length
			}
			return unescape(document.cookie.substring(j,cEnd))
		}
		i++
	}
	return ""
}

// **Write cookie data**


function setCookieData(name,value,expires) {
        counter ++
	document.cookie = name + "=" + counter + "@" + value + "; expires=" + expires + "; Path=" + "/"
}

// **Kill cookie function. When the order is submitted**
// **the cookie is killed via an event handler call.**

function killCookie(name) {
 if (getCookieData(name)) {
 document.cookie = name + "=" + "; expires = Thu, 01-Jan-70 00:00:01 GMT" + ";path = /"
 cookData = ""
 counter = 0
 history.go(0)
 }
}


// ****End shared cookie functions****


// ****Begin code section to update the cookie to ****
// ****add items to the shopping cart cookie 'Scart'.****

// **Global variables.**

var counter = 0
var cookData = ""

// **Extract current value of cookie when page loads **
// **and store the values in the global variables.**

if (getCookieData("Scart")) {

 orderString = getCookieData("Scart")
 cLen = orderString.length
 countEnd = orderString.indexOf("@")
 pointer = countEnd + 1
 counter = orderString.substring(0,countEnd)
 cookData = orderString.substring(pointer,cLen)
}

// **Function to add an item to the shopping cart cookie.**

function addItem(num) {
 a = eval("catNo[num]")
 addCart = '' + a + '`' + itemDesc[num] + '~' + price[num] + '«' + itemQty[num] + '^'
 cookData += eval("addCart")

 if (confirm("Add  ( Qty " + itemQty[num] + " " + a + " " + itemDesc[num] + ' )  to shopping basket')) {
  setCookieData("Scart", cookData, expdate.toGMTString())
}
}


// ****End code section for updating the cookie.****


// ****Debugging function to display cookie contents.****

function showMe() {
 display = getCookieData("Scart");
}