Using Javascript to manipulate cookies to implement the Shopping Cart program

Copy codeThe Code is as follows:
/*************************************** **************************************** **********************
Name shopping cart
Version 1.1:
Author Vanni (fanlin) url: www.27sea.com QQ: 303590170
CreateDate 2005-05-31
Description
This class is based on JavaScript and client cookies. please ensure that the client enables cookies
Data persistence (24*30 hours by default) can be performed through this. expire =? Hours to specify
The two built-in objects typeObj and proObj have two identical attribute names: name and value.

The data storage format in the class is as follows -----------------------------------
Array (
New typeObj ('auto', array (
New porObj ('mitsubishi, 200 ),
New proObj ('honda ', 500)
)
),
New typeObj ('eg', array (
New proObj ('eg', 10 ),
New proObj ('duck eg', 20)
)
}

The Cookie Access format is [encrypted using the escape () function] ------------
Shopping Cart name = car # Mitsubishi: 200 | Honda: 500, eggs # eggs: 10 | duck eggs: 20

Note: When the client saves the Cookie, no problem occurs. If you want to store them cyclically, some may be saved, while some are not saved.
Solution: See the following example (obtain the sales quantity in the URL and store the Cookie)

File: JS code snippets in/depot/compareproduct. php
<Script language = "javascript">
Var car = new Car ('compare ');
Var typeName = 'LIST ';
Car. delType (typeName); // clear the previously compared products

// Obtain the parameters in the URL and separate them into arrays.
Var url = location. href;
Var start = url. lastIndexOf ('? Sales = ');
Var end = url. indexOf ('&');
If (end =-1) end = url. length;
Var urlparam = url. substring (url. lastIndexOf ('? Sales = ') + 7, end). split (',');

Function setPageVal (){
If (car. getPro (typeName). length = urlparam. length) return; // key part. if the array length is not equal, some cookies are not saved.
Else {
Car. addType (typeName); // Add a category
For (I = 0; I <urlparam. length; I ++ ){
Car. addPro (typeName, urlparam [I], ''); // adds a comparison product. If yes, false is returned.
}
SetTimeout ('setpageval (); ', 100); // call itself again. recursion is not used because the recursion speed is too fast and there will still be problems
}
}

SetPageVal (); // initialize data

Function delItem (itemname ){
Car. delPro (typeName, itemname );
Var carData = car. getPro (typeName );
Var url = '';
Var carlen = carData. length;
If (carlen> 1 ){
For (I = 0; I <carData. length; I ++ ){
If (I = 0) url = carData [I]. name;
Else url + = ',' + carData [I]. name;
}
Document. write ("waiting ....");
Location. href = '../depot/compareproduct. php? Sales = '+ url;
} Else {
If (confirm ('if you delete it, there is only one comparison item left. Close this window? ')){
Car. delCar ();
Window. close ();
}
}
}
</Script>

**************************************** **************************************** *********************/
/**
Cookie type
*/
Function Cookie (){
/**
@ Desc set Cookie
@ Return void
*/
This. setCookie = function (name, value, hours ){
Var expire = "";
If (hours! = Null ){
Expire = new Date (). getTime () + hours * 3600000 );
Expire = "; expires =" + expire. toGMTString ();
}
Document. cookie = escape (name) + "=" + escape (value) + expire;
}
　　
/**
@ Desc read Cookie
@ Return String
*/
This. getCookie = function (name ){
Var cookieValue = "";
Var search = escape (name) + "= ";
If (document. cookie. length> 0 ){
Offset = document. cookie. indexOf (search );
If (offset! =-1 ){
Offset + = search. length;
End = document. cookie. indexOf (";", offset );
If (end =-1) end = document. cookie. length;
CookieValue = unescape (document. cookie. substring (offset, end ))
}
}
Return cookieValue;
}
}

Function Car (name ){
　　
If (! Window. clientInformation. cookieEnabled ){
Alert ('the Shopping Cart system cannot be used because your browser does not support cookies ');
Return false;
}
　　
// ### Internal variables ################################## ###########################
　　
This. carName = name;
This. expire = 24*30; // validity period of the shopping cart (30 days)
This. carDatas = new Array ();
This. cookie = new Cookie ();
　　
// ### Internal object ################################## ###########################
　　
This. typeObj = function (name, value) {// Class Object
This. name = name;
This. value = "/value;
}
This. proObj = function (name, value) {// comes with the "Product object"
This. name = name;
This. value = value;
}
　　
// ### List of private methods ################################# #########################
//
// GetTypePoint (typeName); // obtain the subscript of the category array in the shopping cart.
// GetProPoint (typeName, proName); // obtain the product subscript under the category in the shopping cart.
// SaveCookie () // store the Cookie of this shopping cart in a specific form
//
//###################################### ##################################
　　
/**
@ Desc: Obtain the subscript in the category array in the shopping cart. If it is found, the subscript is returned. Otherwise,-1 is returned.
@ Return int
*/
This. getTypePoint = function (typeName ){
Var isok = false;
Var I = 0;
For (; I <this. carDatas. length; I ++ ){
If (this. carDatas [I]. name = typeName ){
Isok = true; // locate
Break;
}
}
If (isok) return I;
Else return-1;
}
　　
/**
@ Desc get the product subscript under the category in the shopping cart and find the return subscript; otherwise,-1 is returned.
@ Return int
*/
This. getProPoint = function (typeId, proName ){
Var isok = false;
Var j = 0;
Var tempProObj = this. carDatas [typeId]. value;
For (; j <tempProObj. length; j ++ ){
If (tempProObj [j]. name = proName ){
Isok = true;
Break;
}
}
If (isok) return j;
Else return-1;
}
　　
/**
@ Desc stores the generated Cookie string
@ Return void
*/
This. saveCookie = function (){
Var outStr = '';
For (I = 0; I <this. carDatas. length; I ++ ){
Var typeName = this. carDatas [I]. name;
Var typeValue = this. carDatas [I]. value;
Var proOutStr = '';
For (j = 0; j <typeValue. length; j ++ ){
If (j = 0) proOutStr = typeValue [j]. name + ':' + typeValue [j]. value;
Else proOutStr + = '|' + typeValue [j]. name + ':' + typeValue [j]. value;
}
If (I = 0) outStr = typeName + '#' + proOutStr;
Else outStr + = ',' + typeName + '#' + proOutStr;
}
This. cookie. setCookie (this. carName, outStr, this. expire); // Save the Cookie
}
　　　　
// ### Construct a statement ################################## ##########################
　　
If (this. cookie. getCookie (name) = ''){
This. cookie. setCookie (name, '', this. expire );
} Else {
Var tempTypes = this. cookie. getCookie (name). split (',');
For (I = 0; I <tempTypes. length; I ++ ){
Var tempTypeObj = tempTypes [I]. split ('#');
Var type_pro = new Array ();
If (tempTypeObj [1]) {
Var tempProObj = tempTypeObj [1]. split ('| ');
For (j = 0; j <tempProObj. length; j ++ ){
Var proDesc = tempProObj [j]. split (':');
Type_pro.push (new this. proObj (proDesc [0], proDesc [1]);
}
}
This. carDatas. push (new this. typeObj (tempTypeObj [0], type_pro ));
}
}

// ### Public method list ################################# ########################
//
// AddType (typeName); // Add a category
// AddPro (typeName, proName, value); // Add a product
// EditPro (typeName, proName, value); // modify the product value
// DelPro (typeName, proName); // delete a product under a category in the shopping cart
// DelType (typeName); // delete a category in the shopping cart, including the product under the category
// DelCar (); // delete a shopping cart
//
// GetCar (); // obtain the data of the entire shopping cart.
// GetType (); // obtain the list of all categories in the cart.
// GetPro (typeName); // get the list of products under the specified category in the shopping cart
// GetProVal (typeName, proName); // get the product attributes under the specified category in the shopping cart
//
//###################################### ##################################
　　
/**
@ Desc adds a category to the shopping cart and returns true if the category is added successfully. Otherwise, false is returned.
@ Return bool
*/
This. addType = function (typeName ){
If (this. getTypePoint (typeName )! =-1) return false; // if this category already exists, false is returned.
This. carDatas. push (new this. typeObj (typeName, new Array (); // push the object to its own Array
This. saveCookie (); // Save the Cookie
Return true;
}
　　
/**
@ Desc Add a product to the shopping cart. if the product is added to the shopping cart, the returned result is true. Otherwise, the returned result is false.
@ Return bool
*/
This. addPro = function (typeName, proName, value ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, cannot be added, and false is returned
Var proPoint = this. getProPoint (typePoint, proName); if (proPoint! =-1) return false; // if this product exists, the duplicate cannot be added, and false is returned.
This. carDatas [typePoint]. value. push (new this. proObj (proName, value); // push to its own array
This. saveCookie (); // Save the Cookie
Return true;
}
　　
/**
@ Desc modify the product attributes in the shopping cart
@ Return bool
*/
This. editPro = function (typeName, proName, value ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, it cannot be modified, and false is returned.
Var proPoint = this. getProPoint (typePoint, proName); if (proPoint =-1) return false; // if this product does not exist, it cannot be modified and false is returned
This. carDatas [typePoint]. value [proPoint]. value = value; // update itself
This. saveCookie (); // Save the Cookie
Return true;
}
　　
/**
@ Desc delete a product
@ Return bool
*/
This. delPro = function (typeName, proName ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, it cannot be deleted, and false is returned.
Var proPoint = this. getProPoint (typePoint, proName); if (proPoint =-1) return false; // if this product does not exist, it cannot be deleted, and false is returned
Var pros = this. carDatas [typePoint]. value. length;
This. carDatas [typePoint]. value [proPoint] = this. carDatas [typePoint]. value [pros-1]; // place the last product on the product to be deleted
This. carDatas [typePoint]. value. pop ();
This. saveCookie (); // Save the Cookie
Return true;
}
　　
/**
@ Desc delete a category
@ Return bool
*/
This. delType = function (typeName ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, it cannot be deleted, and false is returned.
Var types = this. carDatas. length;
This. carDatas [typePoint] = this. carDatas [types-1]; // delete a category
This. carDatas. pop ();
This. saveCookie (); // Save the Cookie
Return true;
}
　　
/**
@ Desc Delete this shopping cart
@ Return void
*/
This. delCar = function (){
This. cookie. setCookie (this. carName, '', 0 );
This. carDatas = new Array ();
This. saveCookie (); // Save the Cookie
}
　　
/**
@ Desc get shopping cart data
@ Return Array
*/
This. getCar = function (){
Return this. carDatas;
}
　　
/**
@ Desc get the category list
@ Return Array
*/
This. getType = function (){
Var returnarr = new Array ();
For (I = 0; I <this. carDatas. length; I ++) returnarr. push (this. carDatas [I]. name );
Return returnarr;
}
　　
/**
@ Desc get the product list under the category
@ Return Array
*/
This. getPro = function (typeName ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, false is returned.
Return this. carDatas [typePoint]. value;
}
　　
/**
@ Desc get product attributes
@ Return String
*/
This. getProVal = function (typeName, proName ){
Var typePoint = this. getTypePoint (typeName); if (typePoint =-1) return false; // if this category does not exist, false is returned.
Var proPoint = this. getProPoint (typePoint, proName); if (proPoint =-1) return false; // if this product does not exist, false is returned.
Return this. carDatas [typePoint]. value [proPoint]. value;
}
}