CookieObject

CookieObject.js

/* 
 * Simple implemtation of storing objects in a cookie.
 * 
 * Requires native JSON support or
 * https://github.com/douglascrockford/JSON-js/blob/master/json2.js
 * for cross browser JSON support.
 * 
 * @param string key - [req] the key of the cookie to create or read.
 * @param object data - [opt] the object to store
 * @param int days - [opt] How many days before cookie expires
 * @param string path - [opt] the path of the cookie
 * 
 * @author max.calabrese@nordinteractive.se
 * 
 * @example 
// Read a cookie 
var cookie = new CookieObject('foo');

// create a Cookie
var cookie = new CookieObject('foo', {a : 'b'});

cookie.data.a
// b
 * 
 */
function CookieObject(key, data, days, path) {

    // Creates a new cookie.
    this.data = data;
    this.key = key;
    this.days = days || 30;
    this.path = path;
	
    function serialize(obj) {
        return JSON.stringify(obj);
    }
        
    function deserialize(str) {
        return JSON.parse(str);
    }
    
    this.read = function () {
        var nameEQ = this.key + "=",
        ca = document.cookie.split(';'),
        i, c;
    
        for (i = 0; i < ca.length; i++) {
            c = ca[i];
  
            while (c.charAt(0) === ' ') {
                c = c.substring(1, c.length);
            }
  
            if (c.indexOf(nameEQ) === 0) {
                return deserialize(c.substring(nameEQ.length, c.length));
            }
        }
        return null;
    }
   
    this.write = function(key, value, days, path) {
        var expires, date, path_to, new_cookie;         
        path_to = "path=/"; 
        if (days) {
            date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toGMTString();
        } 
        else {
            expires = "";
        }         
        if (path){
            path_to = path_to + path;
        } 
        document.cookie = key + "=" + value + expires + ";"+ path_to;          
        new_cookie = this.read(key); 
        return new_cookie;         
    }  
   
    if (!data) {
        this.data = this.read();
    }
    else {
        this.write(this.key, serialize(this.data), this.days, this.path );
    }
    

    
}