API: charts Chart.js (YUI Library)

# Yahoo! UI Library

### Charts Widget 2.9.0

Yahoo! UI Library > charts > Chart.js (source view)
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    /**
     * The Charts widget provides a Flash control for displaying data
     * graphically by series across A-grade browsers with Flash Player installed.
     *
     * @module charts
     * @requires yahoo, dom, event, datasource
     * @title Charts Widget
     */

    /****************************************************************************/
    /****************************************************************************/
    /****************************************************************************/

    /**
     * Chart class for the YUI Charts widget.
     *
     * @namespace YAHOO.widget
     * @class Chart
     * @uses YAHOO.util.AttributeProvider
     * @constructor
     * @param type {String} The char type. May be "line", "column", "bar", or "pie"
     * @param containerId {HTMLElement} Container element for the Flash Player instance.
     * @param dataSource {YAHOO.util.DataSource} DataSource instance.
     * @param attributes {object} (optional) Object literal of configuration values.
     */
    YAHOO.widget.Chart = function(type, containerId, dataSource, configurationAttributes)
    {
    	this._type = type;
    	this._dataSource = dataSource;

    	var possibleParams = {align:"", allowNetworking:"", allowScriptAccess:"", base:"", bgcolor:"", menu:"", name:"", quality:"", salign:"", scale:"", tabindex:"", wmode:""};
    	var attributes = {fixedAttributes:{allowScriptAccess:"always"}, flashVars:{allowedDomain : document.location.hostname}, backgroundColor:"#ffffff", host:this, version:9.045};

    	for(var i in configurationAttributes)
    	{
    		if(possibleParams.hasOwnProperty(i))
    		{
    			attributes.fixedAttributes[i] = configurationAttributes[i];
    		}
    		else
    		{
    			attributes[i] = configurationAttributes[i];
    		}
    	}

    	this._id = attributes.id = attributes.id || YAHOO.util.Dom.generateId(null, "yuigen");

    	this._swfURL = YAHOO.widget.Chart.SWFURL;
    	this._containerID = containerId;

    	this._attributes = attributes;
    	this._swfEmbed = new YAHOO.widget.SWF(containerId, YAHOO.widget.Chart.SWFURL, attributes);

    	this._swf = this._swfEmbed.swf;
    	this._swfEmbed.subscribe("swfReady", this._eventHandler, this, true);

    	/**
    	 * Fires when the SWF is initialized and communication is possible.
    	 * @event contentReady
    	 */
    	//Fix for iframe cross-domain issue with FF2x
    	try
    	{
    		this.createEvent("contentReady");
    	}
    	catch(e){}

    	/**
    	 * Fires when the user moves the mouse over the bounds of an item renderer in the chart.
    	 *
    	 * @event itemMouseOverEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemMouseOverEvent");

    	/**
    	 * Fires when the user moves the mouse out of the bounds of an item renderer in the chart.
    	 *
    	 * @event itemMouseOutEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemMouseOutEvent");

    	/**
    	 * Fires when the user clicks an item renderer in the chart with the mouse.
    	 *
    	 * @event itemClickEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemClickEvent");

    	/**
    	 * Fires when the user double-clicks an item renderer in the chart with the mouse.
    	 *
    	 * @event itemDoubleClickEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemDoubleClickEvent");

    	/**
    	 * Fires when the user presses the mouse down on an item to initiate a drag action.
    	 *
    	 * @event itemDragStartEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemDragStartEvent");

    	/**
    	 * Fires when the user moves the mouse during a drag action.
    	 *
    	 * @event itemDragEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemDragEvent");

    	/**
    	 * Fires when the user releases the mouse during a drag action.
    	 *
    	 * @event itemDragEndEvent
    	 * @param event.type {String} The event type
    	 * @param event.item {Object} The data displayed by the renderer
    	 * @param event.index {Number} The position within the series that the item appears.
    	 * @param event.seriesIndex {Number} The position within the series definition that the series appears.
    	 * @param event.x {Number} The horizontal position of the mouse, relative to the SWF.
    	 * @param event.y {Number} The vertical position of the mouse, relative to the SWF.
    	 */
    	this.createEvent("itemDragEndEvent");
    };

    YAHOO.extend(YAHOO.widget.Chart, YAHOO.util.AttributeProvider,
    {
    	/**
    	 * The type of this chart instance.
    	 * @property _type
    	 * @type String
    	 * @private
    	 */
    	_type: null,

    	/**
    	 * The id returned from the DataSource's setInterval function.
    	 * @property _pollingID
    	 * @type Number
    	 * @private
    	 */
    	_pollingID: null,

    	/**
    	 * The time, in ms, between requests for data.
    	 * @property _pollingInterval
    	 * @type Number
    	 * @private
    	 */
    	_pollingInterval: null,

    	/**
    	 * Stores a reference to the dataTipFunction created by
    	 * YAHOO.widget.Chart.createProxyFunction()
    	 * @property _dataTipFunction
    	 * @type String
    	 * @private
    	 */
    	_dataTipFunction: null,

    	/**
    	 * Stores a reference to the legendLabelFunction created by
    	 * YAHOO.widget.Chart.createProxyFunction()
    	 * @property _legendLabelFunction
    	 * @type String
    	 * @private
    	 */
    	_legendLabelFunction: null,

    	/**
    	 * Stores references to series function values created by
    	 * YAHOO.widget.Chart.createProxyFunction()
    	 * @property _seriesFunctions
    	 * @type Array
    	 * @private
    	 */
    	_seriesFunctions: null,

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

    	/**
    	 * Sets a single style value on the Chart instance.
    	 *
    	 * @method setStyle
    	 * @param name {String} Name of the Chart style value to change.
    	 * @param value {Object} New value to pass to the Chart style.
    	 */
    	setStyle: function(name, value)
    	{
    		//we must jsonify this because Flash Player versions below 9.0.60 don't handle
    		//complex ExternalInterface parsing correctly
    		value = YAHOO.lang.JSON.stringify(value);
    		this._swf.setStyle(name, value);
    	},

    	/**
    	 * Resets all styles on the Chart instance.
    	 *
    	 * @method setStyles
    	 * @param styles {Object} Initializer for all Chart styles.
    	 */
    	setStyles: function(styles)
    	{
    		//we must jsonify this because Flash Player versions below 9.0.60 don't handle
    		//complex ExternalInterface parsing correctly
    		styles = YAHOO.lang.JSON.stringify(styles);
    		this._swf.setStyles(styles);
    	},

    	/**
    	 * Sets the styles on all series in the Chart.
    	 *
    	 * @method setSeriesStyles
    	 * @param styles {Array} Initializer for all Chart series styles.
    	 */
    	setSeriesStyles: function(styles)
    	{
    		//we must jsonify this because Flash Player versions below 9.0.60 don't handle
    		//complex ExternalInterface parsing correctly
    		for(var i = 0; i < styles.length; i++)
    		{
    			styles[i] = YAHOO.lang.JSON.stringify(styles[i]);
    		}
    		this._swf.setSeriesStyles(styles);
    	},

    	destroy: function()
    	{
    		//stop polling if needed
    		if(this._dataSource !== null)
    		{
    			if(this._pollingID !== null)
    			{
    				this._dataSource.clearInterval(this._pollingID);
    				this._pollingID = null;
    			}
    		}

    		//remove proxy functions
    		if(this._dataTipFunction)
    		{
    			YAHOO.widget.Chart.removeProxyFunction(this._dataTipFunction);
    		}

    		if(this._legendLabelFunction)
    		{
    			YAHOO.widget.Chart.removeProxyFunction(this._legendLabelFunction);
    		}

    		//kill the Flash Player instance
    		if(this._swf)
    		{
    			var container = YAHOO.util.Dom.get(this._containerID);
    			container.removeChild(this._swf);
    		}

    		var instanceName = this._id;

    		//null out properties
    		for(var prop in this)
    		{
    			if(YAHOO.lang.hasOwnProperty(this, prop))
    			{
    				this[prop] = null;
    			}
    		}
    	},

    	/**
    	 * Initializes the attributes.
    	 *
    	 * @method _initAttributes
    	 * @private
    	 */
    	_initAttributes: function(attributes)
    	{
    		//YAHOO.widget.Chart.superclass._initAttributes.call(this, attributes);
    		/**
    		 * @attribute wmode
    		 * @description Sets the window mode of the Flash Player control. May be
    		 *		"window", "opaque", or "transparent". Only available in the constructor
    		 *		because it may not be set after Flash Player has been embedded in the page.
    		 * @type String
    		 */

    		/**
    		 * @attribute expressInstall
    		 * @description URL pointing to a SWF file that handles Flash Player's express
    		 *		install feature. Only available in the constructor because it may not be
    		 *		set after Flash Player has been embedded in the page.
    		 * @type String
    		 */

    		/**
    		 * @attribute version
    		 * @description Minimum required version for the SWF file. Only available in the constructor because it may not be
    		 *		set after Flash Player has been embedded in the page.
    		 * @type String
    		 */

    		/**
    		 * @attribute backgroundColor
    		 * @description The background color of the SWF. Only available in the constructor because it may not be
    		 *		set after Flash Player has been embedded in the page.
    		 * @type String
    		 */

    		/**
    		 * @attribute altText
    		 * @description The alternative text to provide for screen readers and other assistive technology.
    		 * @type String
    		 */
    		this.setAttributeConfig("altText",
    		{
    			method: this._setAltText,
    			getter: this._getAltText

    		});

    		/**
    		 * @attribute swfURL
    		 * @description Absolute or relative URL to the SWF displayed by the Chart. Only available in the constructor because it may not be
    		 *		set after Flash Player has been embedded in the page.
    		 * @type String
    		 */
    		this.setAttributeConfig("swfURL",
    		{
    			getter: this._getSWFURL
    		});

    		/**
    		 * @attribute request
    		 * @description Request to be sent to the Chart's DataSource.
    		 * @type String
    		 */
    		this.setAttributeConfig("request",
    		{
    			method: this._setRequest,
    			getter: this._getRequest
    		});

    		/**
    		 * @attribute dataSource
    		 * @description The DataSource instance to display in the Chart.
    		 * @type DataSource
    		 */
    		this.setAttributeConfig("dataSource",
    		{
    			method: this._setDataSource,
    			getter: this._getDataSource
    		});

    		/**
    		 * @attribute series
    		 * @description Defines the series to be displayed by the Chart.
    		 * @type Array
    		 */
    		this.setAttributeConfig("series",
    		{
    			method: this._setSeriesDefs,
    			getter: this._getSeriesDefs
    		});

    		/**
    		 * @attribute categoryNames
    		 * @description Defines the names of the categories to be displayed in the Chart..
    		 * @type Array
    		 */
    		this.setAttributeConfig("categoryNames",
    		{
    			validator: YAHOO.lang.isArray,
    			method: this._setCategoryNames,
    			getter: this._getCategoryNames
    		});

    		/**
    		 * @attribute dataTipFunction
    		 * @description The string representation of a globally-accessible function
    		 * that may be called by the SWF to generate the datatip text for a Chart's item.
    		 * @type String
    		 */
    		this.setAttributeConfig("dataTipFunction",
    		{
    			method: this._setDataTipFunction,
    			getter: this._getDataTipFunction
    		});

    		/**
    		 * @attribute legendLabelFunction
    		 * @description The string representation of a globally-accessible function
    		 * that may be called by the SWF to format the labels of a Chart's legend.
    		 * @type String
    		 */
    		this.setAttributeConfig("legendLabelFunction",
    		{
    			method: this._setLegendLabelFunction,
    			getter: this._getLegendLabelFunction
    		});

    		/**
    		 * @attribute polling
    		 * @description A numeric value indicating the number of milliseconds between
    		 * polling requests to the DataSource.
    		 * @type Number
    		 */
    		this.setAttributeConfig("polling",
    		{
    			method: this._setPolling,
    			getter: this._getPolling
    		});
    	},

    	/**
    	 * Handles swfReady event from SWF.
    	 *
    	 * @method _eventHandler
    	 * @private
    	 */
    	_eventHandler: function(event)
    	{
    		if(event.type == "swfReady")
    		{
       			this._swf = this._swfEmbed._swf;
    			this._loadHandler();
       			this.fireEvent("contentReady");
    		}
    	},

    	/**
    	 * Called when the SWF is ready for communication. Sets the type, initializes
    	 * the styles, and sets the DataSource.
    	 *
    	 * @method _loadHandler
    	 * @private
    	 */
    	_loadHandler: function()
    	{
    		//the type is set separately because it must be first!
    		if(!this._swf || !this._swf.setType) return;
    		this._swf.setType(this._type);

    		//set initial styles
    		if(this._attributes.style)
    		{
    			var style = this._attributes.style;
    			this.setStyles(style);
    		}

    		this._initialized = false;

    		this._initAttributes(this._attributes);
    		this.setAttributes(this._attributes, true);

    		this._initialized = true;
    		if(this._dataSource)
    		{
    			this.set("dataSource", this._dataSource);
    		}
    	},

    	/**
    	 * Sends (or resends) the request to the DataSource.
    	 *
    	 * @method refreshData
    	 */
    	refreshData: function()
    	{
    		if(!this._initialized)
    		{
    			return;
    		}

    		if(this._dataSource !== null)
    		{
    			if(this._pollingID !== null)
    			{
    				this._dataSource.clearInterval(this._pollingID);
    				this._pollingID = null;
    			}

    			if(this._pollingInterval > 0)
    			{
    				this._pollingID = this._dataSource.setInterval(this._pollingInterval, this._request, this._loadDataHandler, this);
    			}
    			this._dataSource.sendRequest(this._request, this._loadDataHandler, this);
    		}
    	},

    	/**
    	 * Called when the DataSource receives new data. The series definitions are used
    	 * to build a data provider for the SWF chart.
    	 *
    	 * @method _loadDataHandler
    	 * @private
    	 */
    	_loadDataHandler: function(request, response, error)
    	{
    		if(this._swf)
    		{
    			if(error)
    			{
    				YAHOO.log("Unable to load data.", "error");
    			}
    			else
    			{
    				var i;
    				if(this._seriesFunctions)
    				{
    					var count = this._seriesFunctions.length;
    					for(i = 0; i < count; i++)
    					{
    						YAHOO.widget.Chart.removeProxyFunction(this._seriesFunctions[i]);
    					}
    					this._seriesFunctions = null;
    				}
    				this._seriesFunctions = [];

    				//make a copy of the series definitions so that we aren't
    				//editing them directly.
    				var dataProvider = [];
    				var seriesCount = 0;
    				var currentSeries = null;
    				if(this._seriesDefs !== null)
    				{
    					seriesCount = this._seriesDefs.length;
    					for(i = 0; i < seriesCount; i++)
    					{
    						currentSeries = this._seriesDefs[i];
    						var clonedSeries = {};
    						for(var prop in currentSeries)
    						{
    							if(YAHOO.lang.hasOwnProperty(currentSeries, prop))
    							{
    								if(prop == "style")
    								{
    									if(currentSeries.style !== null)
    									{
    										clonedSeries.style = YAHOO.lang.JSON.stringify(currentSeries.style);
    									}
    								}

    								else if(prop == "labelFunction")
    								{
    									if(currentSeries.labelFunction !== null)
    									{
    										clonedSeries.labelFunction = YAHOO.widget.Chart.getFunctionReference(currentSeries.labelFunction);
    										this._seriesFunctions.push(clonedSeries.labelFunction);
    									}
    								}

    								else if(prop == "dataTipFunction")
    								{
    									if(currentSeries.dataTipFunction !== null)
    									{
    										clonedSeries.dataTipFunction = YAHOO.widget.Chart.getFunctionReference(currentSeries.dataTipFunction);
    										this._seriesFunctions.push(clonedSeries.dataTipFunction);
    									}
    								}

    								else if(prop == "legendLabelFunction")
    								{
    									if(currentSeries.legendLabelFunction !== null)
    									{
    										clonedSeries.legendLabelFunction = YAHOO.widget.Chart.getFunctionReference(currentSeries.legendLabelFunction);
    										this._seriesFunctions.push(clonedSeries.legendLabelFunction);
    									}
    								}

    								else
    								{
    									clonedSeries[prop] = currentSeries[prop];
    								}
    							}
    						}
    						dataProvider.push(clonedSeries);
    					}
    				}

    				if(seriesCount > 0)
    				{
    					for(i = 0; i < seriesCount; i++)
    					{
    						currentSeries = dataProvider[i];
    						if(!currentSeries.type)
    						{
    							currentSeries.type = this._type;
    						}
    						currentSeries.dataProvider = response.results;
    					}
    				}
    				else
    				{
    					var series = {type: this._type, dataProvider: response.results};
    					dataProvider.push(series);
    				}
    				try
    				{
    					if(this._swf.setDataProvider) this._swf.setDataProvider(dataProvider);
    				}
    				catch(e)
    				{
    					this._swf.setDataProvider(dataProvider);
    				}
    			}
    		}
    	},

    	/**
    	 * Storage for the request attribute.
    	 *
    	 * @property _request
    	 * @private
    	 */
    	_request: "",

    	/**
    	 * Getter for the request attribute.
    	 *
    	 * @method _getRequest
    	 * @private
    	 */
    	_getRequest: function()
    	{
    		return this._request;
    	},

    	/**
    	 * Setter for the request attribute.
    	 *
    	 * @method _setRequest
    	 * @private
    	 */
    	_setRequest: function(value)
    	{
    		this._request = value;
    		this.refreshData();
    	},

    	/**
    	 * Storage for the dataSource attribute.
    	 *
    	 * @property _dataSource
    	 * @private
    	 */
    	_dataSource: null,

    	/**
    	 * Getter for the dataSource attribute.
    	 *
    	 * @method _getDataSource
    	 * @private
    	 */
    	_getDataSource: function()
    	{
    		return this._dataSource;
    	},

    	/**
    	 * Setter for the dataSource attribute.
    	 *
    	 * @method _setDataSource
    	 * @private
    	 */
    	_setDataSource: function(value)
    	{
    		this._dataSource = value;
    		this.refreshData();
    	},

    	/**
    	 * Storage for the series attribute.
    	 *
    	 * @property _seriesDefs
    	 * @private
    	 */
    	_seriesDefs: null,

    	/**
    	 * Getter for the series attribute.
    	 *
    	 * @method _getSeriesDefs
    	 * @private
    	 */
    	_getSeriesDefs: function()
    	{
    		return this._seriesDefs;
    	},

    	/**
    	 * Setter for the series attribute.
    	 *
    	 * @method _setSeriesDefs
    	 * @private
    	 */
    	_setSeriesDefs: function(value)
    	{
    		this._seriesDefs = value;
    		this.refreshData();
    	},

    	/**
    	 * Getter for the categoryNames attribute.
    	 *
    	 * @method _getCategoryNames
    	 * @private
    	 */
    	_getCategoryNames: function()
    	{
    		return this._swf.getCategoryNames();
    	},

    	/**
    	 * Setter for the categoryNames attribute.
    	 *
    	 * @method _setCategoryNames
    	 * @private
    	 */
    	_setCategoryNames: function(value)
    	{
    		this._swf.setCategoryNames(value);
    	},

    	/**
    	 * Setter for the dataTipFunction attribute.
    	 *
    	 * @method _setDataTipFunction
    	 * @private
    	 */
    	_setDataTipFunction: function(value)
    	{
    		if(this._dataTipFunction)
    		{
    			YAHOO.widget.Chart.removeProxyFunction(this._dataTipFunction);
    		}

    		if(value)
    		{
    			this._dataTipFunction = value = YAHOO.widget.Chart.getFunctionReference(value);
    		}
    		this._swf.setDataTipFunction(value);
    	},

    	/**
    	 * Setter for the legendLabelFunction attribute.
    	 *
    	 * @method _setLegendLabelFunction
    	 * @private
    	 */
    	_setLegendLabelFunction: function(value)
    	{
    		if(this._legendLabelFunction)
    		{
    			YAHOO.widget.Chart.removeProxyFunction(this._legendLabelFunction);
    		}

    		if(value)
    		{
    			this._legendLabelFunction = value = YAHOO.widget.Chart.getFunctionReference(value);
    		}
    		this._swf.setLegendLabelFunction(value);
    	},

        /**
         * Getter for the legendLabelFunction attribute.
         *
         * @method _getLegendLabelFunction
         * @private
         */
        _getLegendLabelFunction: function()
        {
            return this._legendLabelFunction;
        },

    	/**
    	 * Getter for the polling attribute.
    	 *
    	 * @method _getPolling
    	 * @private
    	 */
    	_getPolling: function()
    	{
    		return this._pollingInterval;
    	},

    	/**
    	 * Setter for the polling attribute.
    	 *
    	 * @method _setPolling
    	 * @private
    	 */
    	_setPolling: function(value)
    	{
    		this._pollingInterval = value;
    		this.refreshData();
    	},

    	/**
    	 * The javascript wrapper for the swf object
    	 *
    	 * @property _swfEmbed
    	 * @type swf
    	 * @private
    	 */
    	_swfEmbed: null,

    	/**
    	 * The URL of the SWF file.
    	 * @property _swfURL
    	 * @type String
    	 * @private
    	 */
    	_swfURL: null,

    	/**
    	 * The ID of the containing DIV.
    	 * @property _containerID
    	 * @type String
    	 * @private
    	 */
    	_containerID: null,

    	/**
    	 * A reference to the embedded SWF file.
    	 * @property _swf
    	 * @private
    	 */
    	_swf: null,

    	/**
    	 * The id of this instance.
    	 * @property _id
    	 * @type String
    	 * @private
    	 */
    	_id: null,

    	/**
    	 * Indicates whether the SWF has been initialized and is ready
    	 * to communicate with JavaScript
    	 * @property _initialized
    	 * @type Boolean
    	 * @private
    	 */
    	_initialized: false,

    	/**
    	 * The initializing attributes are stored here until the SWF is ready.
    	 * @property _attributes
    	 * @type Object
    	 * @private
    	 */
    	_attributes: null, //the intializing attributes

    	set: function(name, value)
    	{
    		//save all the attributes in case the swf reloads
    		//so that we can pass them in again
    		this._attributes[name] = value;
    		YAHOO.widget.Chart.superclass.set.call(this, name, value);
    	},

    	/**
    	 * Getter for swfURL attribute.
    	 *
    	 * @method _getSWFURL
    	 * @private
    	 */
    	_getSWFURL: function()
    	{
    		return this._swfURL;
    	},

    	/**
    	 * Getter for altText attribute.
    	 *
    	 * @method _getAltText
    	 * @private
    	 */
    	_getAltText: function()
    	{
    		return this._swf.getAltText();
    	},

    	/**
    	 * Setter for altText attribute.
    	 *
    	 * @method _setAltText
    	 * @private
    	 */
    	_setAltText: function(value)
    	{
    	 	this._swf.setAltText(value);
    	}
    });

    /**
     * The number of proxy functions that have been created.
     * @static
     * @private
     */
    YAHOO.widget.Chart.proxyFunctionCount = 0;

    /**
     * Creates a globally accessible function that wraps a function reference.
     * Returns the proxy function's name as a string for use by the SWF through
     * ExternalInterface.
     *
     * @method YAHOO.widget.Chart.createProxyFunction
     * @static
     * @private
     */
    YAHOO.widget.Chart.createProxyFunction = function(func, scope)
    {
    	var scope = scope || null;
    	var index = YAHOO.widget.Chart.proxyFunctionCount;
    	YAHOO.widget.Chart["proxyFunction" + index] = function()
    	{
    		return func.apply(scope, arguments);
    	};
    	YAHOO.widget.Chart.proxyFunctionCount++;
    	return "YAHOO.widget.Chart.proxyFunction" + index.toString();
    };

    /**
     * Uses YAHOO.widget.Chart.createProxyFunction to return string
     * reference to a function.
     *
     * @method YAHOO.widget.Chart.getFunctionReference
     * @static
     * @private
     */
    YAHOO.widget.Chart.getFunctionReference = function(value)
    {
    	if(typeof value == "function")
    	{
    		value = YAHOO.widget.Chart.createProxyFunction(value);
    	}
    	else if(value.func && typeof value.func == "function")
    	{
    		var args = [value.func];
    		if(value.scope && typeof value.scope == "object")
    		{
    			args.push(value.scope);
    		}
    		value = YAHOO.widget.Chart.createProxyFunction.apply(this, args);
    	}
    	return value;
    }

    /**
     * Removes a function created with createProxyFunction()
     *
     * @method YAHOO.widget.Chart.removeProxyFunction
     * @static
     * @private
     */
    YAHOO.widget.Chart.removeProxyFunction = function(funcName)
    {
    	//quick error check
    	if(!funcName || funcName.indexOf("YAHOO.widget.Chart.proxyFunction") < 0)
    	{
    		return;
    	}

    	funcName = funcName.substr(26);
    	YAHOO.widget.Chart[funcName] = null;
    };

    /**
     * Storage for the dataTipFunction attribute.
     *
     * @property Chart.SWFURL
     * @private
     * @static
     * @final
     * @default "assets/charts.swf"
     */
    YAHOO.widget.Chart.SWFURL = "assets/charts.swf";

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