API: swfstore swfstore.js (YUI Library)

# Yahoo! UI Library

### swfstore 2.9.0

Yahoo! UI Library > swfstore > swfstore.js (source view)
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    /**
     * Provides a swf based storage implementation
     *
     * @module swfstore
     */

    /**
     * Class for the YUI SWFStore util.
     *
     * @namespace YAHOO.util
     * @class SWFStore
     * @uses YAHOO.util.AttributeProvider
     * @constructor
     * @param containerId {HTMLElement} Container element for the Flash Player instance.
     * @param shareData {Boolean} Whether or not data should be shared across browsers
     * @param useCompression {Boolean} Container element for the Flash Player instance.
     */
    YAHOO.util.SWFStore = function(containerID, shareData, useCompression)
    {
    			//browser detection
    			var browser;
    			var newValue;
    			//convert Booleans to strings for flashvars compatibility
    			shareData = shareData.toString();
    			useCompression = useCompression.toString();

    			if (YAHOO.env.ua.ie) browser = "ie";
    			else if (YAHOO.env.ua.gecko) browser =  "gecko";  //Firefox
    			else if (YAHOO.env.ua.webkit) browser =  "webkit"; // Safari, Webkit
    			else if (YAHOO.env.ua.caja) browser =  "caja";
    			else if (YAHOO.env.ua.opera) browser =  "opera";
    			else browser =  "other";

    			if(YAHOO.util.Cookie.get("swfstore") == null || YAHOO.util.Cookie.get("swfstore") == "null" || YAHOO.util.Cookie.get("swfstore") == "")
    			{

    				newValue = Math.round(Math.random() * Math.PI * 100000);
    				YAHOO.util.Cookie.set("swfstore", newValue);

    			}

    			else
    			{
    				newValue = YAHOO.util.Cookie.get("swfstore");
    			}

    			var params =
    				{
    					version: 9.115,
    					useExpressInstall: false,
    					fixedAttributes:
    						{allowScriptAccess:"always", allowNetworking:"all", scale:"noScale"},
    						flashVars:
    							{allowedDomain : document.location.hostname, shareData: shareData, browser: newValue, useCompression: useCompression}
    				 };

    	this.embeddedSWF = new YAHOO.widget.SWF(containerID, YAHOO.util.SWFStore.SWFURL, params);

    	/**
    	 * Fires when an error occurs
    	 *
    	 * @event error
    	 * @param event.type {String} The event type
    	 * @param event.message {String} The data
    	 *
    	 */
    	this.createEvent("error");

    	/**
    	 * Fires when there is not enough space available to store the data
    	 *
    	 * @event quotaExceededError
    	 * @param event.type {String} The event type
    	 * @param event.message {String} The data
    	 *
    	 */
    	this.createEvent("quotaExceededError");

    	/**
    	 * Fires when the url matching for the security whitelist is invalid.
         * If no whitelist is used, fires when page's url does not match the embedded swf's url
    	 *
    	 * @event securityError
    	 * @param event.type {String} The event type
    	 * @param event.message {String} The data
    	 *
    	 */
    	this.createEvent("securityError");

    	/**
    	 * Fires when a store is saved successfully
    	 *
    	 * @event save
    	 * @param event.type {String} The event type
    	 *
    	 */
    	this.createEvent("save");

    	/**
    	 * Fires when a store is successfully cleared
    	 *
    	 * @event clear
    	 * @param event.type {String} The event type
    	 *
    	 */
    	this.createEvent("clear");

    	/**
    	 * Fires when the save is pending, due to a request for additional storage
    	 *
    	 * @event error
    	 * @param event.type {String} The event type
    	 *
    	 */
    	this.createEvent("pending");

    	/**
    	 * Fires as the settings dialog displays
    	 *
    	 * @event openingDialog
    	 * @param event.type {String} The event type
    	 *
    	 */
    	this.createEvent("openingDialog");

    	/**
    	 * Fires when a settings dialog is not able to be displayed due to
    	 * the SWF not being large enough to show it. In this case, the developer
    	 * needs to resize the SWF to width of 215px and height of 138px or above,
    	 * or display an external settings page.
    	 *
    	 * @event inadequateDimensions
    	 * @param event.type {String} The event type
    	 *
    	 */
    	this.createEvent("inadequateDimensions");
    };

    YAHOO.extend(YAHOO.util.SWFStore, YAHOO.util.AttributeProvider,
    {

    	/**
    	 * Method to attach listeners to events
    	 * @param type {String} The tyep of event to listen for
    	 * @param listener {String} The function to call
    	 */
    	on: function(type, listener)
    	{
    		this.embeddedSWF.addListener(type, listener);
    	},

    	/**
    	 * Method to attach listeners to events
    	 * @param type {String} The tyep of event to listen for
    	 * @param listener {String} The function to call
    	 */
    	addListener: function(type, listener)
    	{
    		YAHOO.log("adding '" + type + "' listener");
    		this.embeddedSWF.addListener(type, listener);
    	},

    	/**
    	 * Public accessor to the unique name of the SWFStore instance.
    	 *
    	 * @method toString
    	 * @return {String} Unique name of the SWFStore instance.
    	 */
    	toString: function()
    	{
    		return "SWFStore " + this._id;
    	},

    	/**
    	 * Public accessor to the unique name of the SWFStore instance.
    	 *
    	 * @method getShareData
    	 * @return {Boolean} Whether or not data is being shared among browsers
    	 */
    	getShareData: function()
    	{
    		return this.embeddedSWF.callSWF("getShareData");
    	},
    	/**
    	 * Public accessor to the unique name of the SWFStore instance.
    	 *
    	 * @method setShareData
    	 * @param {Boolean} Whether or not to share among browsers
    	 */
    	setShareData: function(value)
    	{
    		YAHOO.log("Setting share data to " + value);
    		this.embeddedSWF.callSWF("setShareData", [value]);
    	},

    	/**
    	 * Determines if SWF's visible area is large enough to fit the settings panel
    	 *
    	 * @method hasAdequateDimensions
    	 * @return {Boolean} Whether or not to share among browsers
    	 */
    	hasAdequateDimensions: function()
    	{
    		YAHOO.log("dimensions adequate? " + this.embeddedSWF.callSWF("hasAdequateDimensions"));
    		return this.embeddedSWF.callSWF("hasAdequateDimensions");
    	},

    	/**
    	 * Public accessor to the unique name of the SWFStore instance.
    	 *
    	 * @method getUseCompression
    	 * @return {Boolean} Whether or compression is being used
    	 */
    	getUseCompression: function()
    	{
    		return this.embeddedSWF.callSWF("getUseCompression");
    	},

    	/**
    	 * Public accessor to the unique name of the SWFStore instance.
    	 *
    	 * @method setUseCompression
    	 * @param {Boolean} Whether or to compress stored data
    	 */
    	setUseCompression: function(value)
    	{
    		YAHOO.log("Setting compression to " + value);
    		this.embeddedSWF.callSWF("setUseCompression", [value]);
    	},

    	   /**
    	    * Saves data to local storage. It returns a String that can
    		* be one of three values: "true" if the storage succeeded; "false" if the user
    		* has denied storage on their machine or storage space allotted is not sufficient.
    		* <p>The size limit for the passed parameters is ~40Kb.</p>
    		* @method setItem
    	    * @param data {Object} The data to store
    	    * @param location {String} The name of the "cookie" or store
    		* @return {Boolean} Whether or not the save was successful
    	    *
    	    */
    		setItem: function(location,data)
    		{
    			if(typeof data == "string")
    			{
    				//double encode strings to prevent parsing error
    				//http://yuilibrary.com/projects/yui2/ticket/2528593
    				data = data.replace(/\\/g, '\\\\');
    			}

    			YAHOO.log("setting " + location + " to " + data);
    			return this.embeddedSWF.callSWF("setItem", [location, data]);
    		} ,

    	   /**
    	    * Returns the value of the store at the specified index, if any.
    		* @method getValueAt
    	    * @param index {Number} The index of the stored item
    	    * @return {Object} The value of the store at that index
    	    *
    	    */
    		getValueAt: function(index)
    		{
    			YAHOO.log("value at " + index + " is " + this.embeddedSWF.callSWF("getValueAt", [index]) );
    			return this.embeddedSWF.callSWF("getValueAt", [index]);
    		},

    	   /**
    	    * Returns the key name in storage, if any, at the specified index.
    	    *
    	    * @param index {Number} The index of the "cookie" or store
    		* @return {Object}The data
    		* @method setItem
    	    *
    	    */
    		getNameAt: function(index)
    		{
    			YAHOO.log("name at " + index + " is " + this.embeddedSWF.callSWF("getNameAt", [index]) );
    			return this.embeddedSWF.callSWF("getNameAt", [index]);
    		},

    	    /**
    	    * Returns the value of the item in storage, if any.
    	    * @method getValueOf
    	    * @param location {String} The name of the "cookie" or store
    		* @return {Object} The data
    	    *
    	    */
    		getValueOf: function(location)
    		{
    			YAHOO.log("value of " + location + " is " + this.embeddedSWF.callSWF("getValueOf", [location]) );
    			return this.embeddedSWF.callSWF("getValueOf", [location]);
    		} ,

    	    /**
    	    *  Returns the data type of of the storage.
    		* <p>May be one of the following types:
    	    * <ul>
    	    * <li>boolean</li>
    	    * <li>function</li>
    	    * <li>number</li>
    	    * <li>object</li>
    	    * <li>string</li>
    	    * <li>number</li>
    	    * <li>xml</li>
    	    * </ul>
    	    * </p>
    	    * @method getTypeOf
    	    * @param location {String} The name of the "cookie" or store
    		* @return {String} The type
    	    *
    	    */
    		getTypeOf: function(location)
    		{
    			YAHOO.log("type of " + location + " is " + this.embeddedSWF.callSWF("getTypeOf", [location]) );
    			return this.embeddedSWF.callSWF("getTypeOf", [location]);
    		} ,

    	    /**
    	    *  Returns the data type of of the storage.
    		* <p>May be one of the following types:
    	    * <ul>
    	    * <li>boolean</li>
    	    * <li>function</li>
    	    * <li>number</li>
    	    * <li>object</li>
    	    * <li>string</li>
    	    * <li>number</li>
    	    * <li>xml</li>
    	    * </ul>
    	    * </p>
    	    * @method getTypeAt
    	    * @param location {Number} The index of the "cookie" or store
    		* @return {String} The type
    	    *
    	    */
    		getTypeAt: function(index)
    		{
    			YAHOO.log("type at " + index + " is " + this.embeddedSWF.callSWF("getTypeAt", [index]) );
    			return this.embeddedSWF.callSWF("getTypeAt", [index]);
    		} ,

    		/**
    		 * Returns the items in storage as an array.
    		 * @method getItems
    		 * @return {Object} The data.
    		 * @public
    		 */
    		getItems: function()
    		{
    			return this.embeddedSWF.callSWF("getItems", []);
    		},

    	    /**
    	    * Removes the item in storage, if any.
    	    * @method removeItem
    	    * @param location {String} The name of the "cookie" or store
    	    *
    	    */
    		removeItem: function(location)
    		{
    			YAHOO.log("removing " + location);
    			return this.embeddedSWF.callSWF("removeItem", [location]);
    		} ,

    	    /**
    	    * Removes the item in storage at the specified index, if any.
    	    * @method removeItem
    	    * @param index {Number} The index of the "cookie" or store
    	    *
    	    */
    		removeItemAt: function(index)
    		{
    			YAHOO.log("removing item at " + index);
    			return this.embeddedSWF.callSWF("removeItemAt", [index]);
    		} ,

    	    /**
    	    * Returns the number of items in storage, if any.
    	    * @method getLength
    	    * @return {Number} The number of items
    	    *
    	    */
    		getLength: function()
    		{
    			return this.embeddedSWF.callSWF("getLength", []);
    		} ,

    	   /**
    	    * Removes all data in local storage for this domain.
    	    * <p>Be careful when using this method, as it may
    	    * remove stored information that is used by other applications
    	    * in this domain </p>
    	    * @method clear
    	    */
    		clear: function()
    		{
    			YAHOO.log("clearing all items");
    			return this.embeddedSWF.callSWF("clear", []);
    		} ,

    	    /**
    	     * Gets the current size, in KB, of the amount of space taken by the current store.
    		 * Note that this is calculated, and may take time depending on the number of items stored
    	     * @method calculateCurrentSize
    	     * @return {Number} The size of the store in KB
    	     */
    		calculateCurrentSize: function()
    		{
    			YAHOO.log("calculating size");
    			return this.embeddedSWF.callSWF("calculateCurrentSize", []);
    		} ,

    	    /**
    	     * Gets the timestamp of the last store. This value is automatically set when
    	     * data is stored.
    	     * @method getModificationDate
    	     * @return {Date} A Date object
    	     */
    		getModificationDate: function()
    		{
    			YAHOO.log("getting date");
    			return this.embeddedSWF.callSWF("getModificationDate", []);
    		} ,

    		/**
    		* This method requests more storage (if the amount is above 100KB or the current setting).
    		*
    		* The request dialog has to be displayed within the Flash player itself
    		* so the SWF it is called from must be visible and at least 215px x 138px (w x h) in size.
    		*
    		* @method setSize
    		* @param value {Number} The size, in KB
    		* @return {String}
    		*/
    		setSize: function(value)
    		{
    			var result = this.embeddedSWF.callSWF("setSize", [value]);
    			YAHOO.log("attempt to set size to " + value*1024 + " bytes resulted in " + result);
    			return result;
    		} ,

    		/**
    		 * Displays the settings dialog to allow the user to configure
    		 * storage settings manually. If the SWF height and width are smaller than
    		 * what is allowable to display the local settings panel,
    		 * an openExternalDialog message will be sent to JavaScript.
    		 * @method displaySettings
    		 */
    		displaySettings: function()
    		{
    			YAHOO.log("attempting to show settings. are dimensions adequate? " + this.embeddedSWF.callSWF("hasAdequateDimensions"));
    			this.embeddedSWF.callSWF("displaySettings", []);
    		}

    });

    YAHOO.util.SWFStore.SWFURL = "swfstore.swf";

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