API: cookie Cookie.js (YUI Library)

# Yahoo! UI Library

### cookie 2.8.1

Yahoo! UI Library > cookie > Cookie.js (source view)
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    /**
     * Utilities for cookie management
     * @namespace YAHOO.util
     * @module cookie
     */
    YAHOO.namespace("util");

    /**
     * Cookie utility.
     * @class Cookie
     * @static
     */
    YAHOO.util.Cookie = {

        //-------------------------------------------------------------------------
        // Private Methods
        //-------------------------------------------------------------------------

        /**
         * Creates a cookie string that can be assigned into document.cookie.
         * @param {String} name The name of the cookie.
         * @param {String} value The value of the cookie.
         * @param {Boolean} encodeValue True to encode the value, false to leave as-is.
         * @param {Object} options (Optional) Options for the cookie.
         * @return {String} The formatted cookie string.
         * @method _createCookieString
         * @private
         * @static
         */
        _createCookieString : function (name /*:String*/, value /*:Variant*/, encodeValue /*:Boolean*/, options /*:Object*/) /*:String*/ {

            //shortcut
            var lang = YAHOO.lang,
                text = encodeURIComponent(name) + "=" + (encodeValue ? encodeURIComponent(value) : value);

            if (lang.isObject(options)){
                //expiration date
                if (options.expires instanceof Date){
                    text += "; expires=" + options.expires.toUTCString();
                }

                //path
                if (lang.isString(options.path) && options.path !== ""){
                    text += "; path=" + options.path;
                }

                //domain
                if (lang.isString(options.domain) && options.domain !== ""){
                    text += "; domain=" + options.domain;
                }

                //secure
                if (options.secure === true){
                    text += "; secure";
                }
            }

            return text;
        },

        /**
         * Formats a cookie value for an object containing multiple values.
         * @param {Object} hash An object of key-value pairs to create a string for.
         * @return {String} A string suitable for use as a cookie value.
         * @method _createCookieHashString
         * @private
         * @static
         */
        _createCookieHashString : function (hash /*:Object*/) /*:String*/ {

            //shortcuts
            var lang = YAHOO.lang;

            if (!lang.isObject(hash)){
                throw new TypeError("Cookie._createCookieHashString(): Argument must be an object.");
            }

            var text /*:Array*/ = [];

            for (var key in hash){
                if (lang.hasOwnProperty(hash, key) && !lang.isFunction(hash[key]) && !lang.isUndefined(hash[key])){
                    text.push(encodeURIComponent(key) + "=" + encodeURIComponent(String(hash[key])));
                }
            }

            return text.join("&");
        },

        /**
         * Parses a cookie hash string into an object.
         * @param {String} text The cookie hash string to parse. The string should already be URL-decoded.
         * @return {Object} An object containing entries for each cookie value.
         * @method _parseCookieHash
         * @private
         * @static
         */
        _parseCookieHash : function (text /*:String*/) /*:Object*/ {

            var hashParts /*:Array*/ = text.split("&"),
                hashPart /*:Array*/ = null,
                hash /*:Object*/ = {};

            if (text.length > 0){
                for (var i=0, len=hashParts.length; i < len; i++){
                    hashPart = hashParts[i].split("=");
                    hash[decodeURIComponent(hashPart[0])] = decodeURIComponent(hashPart[1]);
                }
            }

            return hash;
        },

        /**
         * Parses a cookie string into an object representing all accessible cookies.
         * @param {String} text The cookie string to parse.
         * @param {Boolean} decode (Optional) Indicates if the cookie values should be decoded or not. Default is true.
         * @return {Object} An object containing entries for each accessible cookie.
         * @method _parseCookieString
         * @private
         * @static
         */
        _parseCookieString : function (text /*:String*/, decode /*:Boolean*/) /*:Object*/ {

            var cookies /*:Object*/ = {};

            if (YAHOO.lang.isString(text) && text.length > 0) {

                var decodeValue = (decode === false ? function(s){return s;} : decodeURIComponent);

                var cookieParts /*:Array*/ = text.split(/;\s/g),
                    cookieName /*:String*/ = null,
                    cookieValue /*:String*/ = null,
                    cookieNameValue /*:Array*/ = null;

                for (var i=0, len=cookieParts.length; i < len; i++){

                    //check for normally-formatted cookie (name-value)
                    cookieNameValue = cookieParts[i].match(/([^=]+)=/i);
                    if (cookieNameValue instanceof Array){
                        try {
                            cookieName = decodeURIComponent(cookieNameValue[1]);
                            cookieValue = decodeValue(cookieParts[i].substring(cookieNameValue[1].length+1));
                        } catch (ex){
                            //ignore the entire cookie - encoding is likely invalid
                        }
                    } else {
                        //means the cookie does not have an "=", so treat it as a boolean flag
                        cookieName = decodeURIComponent(cookieParts[i]);
                        cookieValue = "";
                    }
                    cookies[cookieName] = cookieValue;
                }

            }

            return cookies;
        },

        //-------------------------------------------------------------------------
        // Public Methods
        //-------------------------------------------------------------------------

        /**
         * Determines if the cookie with the given name exists. This is useful for
         * Boolean cookies (those that do not follow the name=value convention).
         * @param {String} name The name of the cookie to check.
         * @return {Boolean} True if the cookie exists, false if not.
         * @method exists
         * @static
         */
        exists: function(name) {

            if (!YAHOO.lang.isString(name) || name === ""){
                throw new TypeError("Cookie.exists(): Cookie name must be a non-empty string.");
            }

            var cookies /*:Object*/ = this._parseCookieString(document.cookie, true);

            return cookies.hasOwnProperty(name);
        },

        /**
         * Returns the cookie value for the given name.
         * @param {String} name The name of the cookie to retrieve.
         * @param {Object|Function} options (Optional) An object containing one or more
         *      cookie options: raw (true/false) and converter (a function).
         *      The converter function is run on the value before returning it. The
         *      function is not used if the cookie doesn't exist. The function can be
         *      passed instead of the options object for backwards compatibility.
         * @return {Variant} If no converter is specified, returns a string or null if
         *      the cookie doesn't exist. If the converter is specified, returns the value
         *      returned from the converter or null if the cookie doesn't exist.
         * @method get
         * @static
         */
        get : function (name /*:String*/, options /*:Variant*/) /*:Variant*/{

            var lang = YAHOO.lang,
                converter;

            if (lang.isFunction(options)) {
                converter = options;
                options = {};
            } else if (lang.isObject(options)) {
                converter = options.converter;
            } else {
                options = {};
            }

            var cookies /*:Object*/ = this._parseCookieString(document.cookie, !options.raw);

            if (!lang.isString(name) || name === ""){
                throw new TypeError("Cookie.get(): Cookie name must be a non-empty string.");
            }

            if (lang.isUndefined(cookies[name])) {
                return null;
            }

            if (!lang.isFunction(converter)){
                return cookies[name];
            } else {
                return converter(cookies[name]);
            }
        },

        /**
         * Returns the value of a subcookie.
         * @param {String} name The name of the cookie to retrieve.
         * @param {String} subName The name of the subcookie to retrieve.
         * @param {Function} converter (Optional) A function to run on the value before returning
         *      it. The function is not used if the cookie doesn't exist.
         * @return {Variant} If the cookie doesn't exist, null is returned. If the subcookie
         *      doesn't exist, null if also returned. If no converter is specified and the
         *      subcookie exists, a string is returned. If a converter is specified and the
         *      subcookie exists, the value returned from the converter is returned.
         * @method getSub
         * @static
         */
        getSub : function (name, subName, converter) {

            var lang = YAHOO.lang,
                hash = this.getSubs(name);

            if (hash !== null) {

                if (!lang.isString(subName) || subName === ""){
                    throw new TypeError("Cookie.getSub(): Subcookie name must be a non-empty string.");
                }

                if (lang.isUndefined(hash[subName])){
                    return null;
                }

                if (!lang.isFunction(converter)){
                    return hash[subName];
                } else {
                    return converter(hash[subName]);
                }
            } else {
                return null;
            }

        },

        /**
         * Returns an object containing name-value pairs stored in the cookie with the given name.
         * @param {String} name The name of the cookie to retrieve.
         * @return {Object} An object of name-value pairs if the cookie with the given name
         *      exists, null if it does not.
         * @method getSubs
         * @static
         */
        getSubs : function (name /*:String*/) /*:Object*/ {

            var isString = YAHOO.lang.isString;

            //check cookie name
            if (!isString(name) || name === ""){
                throw new TypeError("Cookie.getSubs(): Cookie name must be a non-empty string.");
            }

            var cookies = this._parseCookieString(document.cookie, false);
            if (isString(cookies[name])){
                return this._parseCookieHash(cookies[name]);
            }
            return null;
        },

        /**
         * Removes a cookie from the machine by setting its expiration date to
         * sometime in the past.
         * @param {String} name The name of the cookie to remove.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string),
         *      and secure (true/false). The expires option will be overwritten
         *      by the method.
         * @return {String} The created cookie string.
         * @method remove
         * @static
         */
        remove : function (name /*:String*/, options /*:Object*/) /*:String*/ {

            //check cookie name
            if (!YAHOO.lang.isString(name) || name === ""){
                throw new TypeError("Cookie.remove(): Cookie name must be a non-empty string.");
            }

            //set options - clone options so the original isn't affected
            options = YAHOO.lang.merge(options || {}, {
                expires: new Date(0)
            });

            //set cookie
            return this.set(name, "", options);
        },

        /**
         * Removes a subcookie with a given name. Removing the last subcookie
         *      won't remove the entire cookie unless options.removeIfEmpty is true.
         * @param {String} name The name of the cookie in which the subcookie exists.
         * @param {String} subName The name of the subcookie to remove.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      removeIfEmpty (true/false), and secure (true/false). This must be the same
         *      settings as the original subcookie.
         * @return {String} The created cookie string.
         * @method removeSub
         * @static
         */
        removeSub : function(name /*:String*/, subName /*:String*/, options /*:Object*/) /*:String*/ {

            var lang = YAHOO.lang;

            options = options || {};

            //check cookie name
            if (!lang.isString(name) || name === ""){
                throw new TypeError("Cookie.removeSub(): Cookie name must be a non-empty string.");
            }

            //check subcookie name
            if (!lang.isString(subName) || subName === ""){
                throw new TypeError("Cookie.removeSub(): Subcookie name must be a non-empty string.");
            }

            //get all subcookies for this cookie
            var subs = this.getSubs(name);

            //delete the indicated subcookie
            if (lang.isObject(subs) && lang.hasOwnProperty(subs, subName)){
                delete subs[subName];

                if (!options.removeIfEmpty) {
                    //reset the cookie

                    return this.setSubs(name, subs, options);
                } else {
                    //reset the cookie if there are subcookies left, else remove
                    for (var key in subs){
                        if (lang.hasOwnProperty(subs, key) && !lang.isFunction(subs[key]) && !lang.isUndefined(subs[key])){
                            return this.setSubs(name, subs, options);
                        }
                    }

                    return this.remove(name, options);
                }
            } else {
                return "";
            }

        },

        /**
         * Sets a cookie with a given name and value.
         * @param {String} name The name of the cookie to set.
         * @param {Variant} value The value to set for the cookie.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      raw (true/false), and secure (true/false).
         * @return {String} The created cookie string.
         * @method set
         * @static
         */
        set : function (name /*:String*/, value /*:Variant*/, options /*:Object*/) /*:String*/ {

            var lang = YAHOO.lang;

            options = options || {};

            if (!lang.isString(name)){
                throw new TypeError("Cookie.set(): Cookie name must be a string.");
            }

            if (lang.isUndefined(value)){
                throw new TypeError("Cookie.set(): Value cannot be undefined.");
            }

            var text /*:String*/ = this._createCookieString(name, value, !options.raw, options);
            document.cookie = text;
            return text;
        },

        /**
         * Sets a sub cookie with a given name to a particular value.
         * @param {String} name The name of the cookie to set.
         * @param {String} subName The name of the subcookie to set.
         * @param {Variant} value The value to set.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      and secure (true/false).
         * @return {String} The created cookie string.
         * @method setSub
         * @static
         */
        setSub : function (name /*:String*/, subName /*:String*/, value /*:Variant*/, options /*:Object*/) /*:String*/ {

            var lang = YAHOO.lang;

            if (!lang.isString(name) || name === ""){
                throw new TypeError("Cookie.setSub(): Cookie name must be a non-empty string.");
            }

            if (!lang.isString(subName) || subName === ""){
                throw new TypeError("Cookie.setSub(): Subcookie name must be a non-empty string.");
            }

            if (lang.isUndefined(value)){
                throw new TypeError("Cookie.setSub(): Subcookie value cannot be undefined.");
            }

            var hash /*:Object*/ = this.getSubs(name);

            if (!lang.isObject(hash)){
                hash = {};
            }

            hash[subName] = value;

            return this.setSubs(name, hash, options);

        },

        /**
         * Sets a cookie with a given name to contain a hash of name-value pairs.
         * @param {String} name The name of the cookie to set.
         * @param {Object} value An object containing name-value pairs.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      and secure (true/false).
         * @return {String} The created cookie string.
         * @method setSubs
         * @static
         */
        setSubs : function (name /*:String*/, value /*:Object*/, options /*:Object*/) /*:String*/ {

            var lang = YAHOO.lang;

            if (!lang.isString(name)){
                throw new TypeError("Cookie.setSubs(): Cookie name must be a string.");
            }

            if (!lang.isObject(value)){
                throw new TypeError("Cookie.setSubs(): Cookie value must be an object.");
            }

            var text /*:String*/ = this._createCookieString(name, this._createCookieHashString(value), false, options);
            document.cookie = text;
            return text;
        }

    };

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