API: profilerviewer profilerviewer.js (YUI Library)

# Yahoo! UI Library

### profilerviewer 2.8.1

Yahoo! UI Library > profilerviewer > profilerviewer.js (source view)
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    (function() {

        /**
         * The ProfilerViewer module provides a graphical display for viewing
    	 * the output of the YUI Profiler <http://developer.yahoo.com/yui/profiler>.
         * @module profilerviewer
         * @requires yahoo, dom, event, element, profiler, yuiloader
         */

        /**
         * A widget to view YUI Profiler output.
         * @namespace YAHOO.widget
         * @class ProfilerViewer
         * @extends YAHOO.util.Element
         * @constructor
         * @param {HTMLElement | String | Object} el(optional) The html
         * element into which the ProfileViewer should be rendered.
         * An element will be created if none provided.
         * @param {Object} attr (optional) A key map of the ProfilerViewer's
         * initial attributes.  Ignored if first arg is an attributes object.
         */
        YAHOO.widget.ProfilerViewer = function(el, attr) {
            attr = attr || {};
            if (arguments.length == 1 && !YAHOO.lang.isString(el) && !el.nodeName) {
                attr = el;
                el = attr.element || null;
            }
            if (!el && !attr.element) {
                el = this._createProfilerViewerElement();
            }

        	YAHOO.widget.ProfilerViewer.superclass.constructor.call(this, el, attr);

    		this._init();

    		YAHOO.log("ProfilerViewer instantiated.", "info", "ProfilerViewer");
        };

        YAHOO.extend(YAHOO.widget.ProfilerViewer, YAHOO.util.Element);

    	// Static members of YAHOO.widget.ProfilerViewer:
    	YAHOO.lang.augmentObject(YAHOO.widget.ProfilerViewer, {
    		/**
    		 * Classname for ProfilerViewer containing element.
    		 * @static
    		 * @property CLASS
    		 * @type string
    		 * @public
    		 * @default "yui-pv"
    		 */
    		CLASS: 'yui-pv',

    		/**
    		 * Classname for ProfilerViewer button dashboard.
    		 * @static
    		 * @property CLASS_DASHBOARD
    		 * @type string
    		 * @public
    		 * @default "yui-pv-dashboard"
    		 */
    		CLASS_DASHBOARD: 'yui-pv-dashboard',

    		/**
    		 * Classname for the "refresh data" button.
    		 * @static
    		 * @property CLASS_REFRESH
    		 * @type string
    		 * @public
    		 * @default "yui-pv-refresh"
    		 */
    		CLASS_REFRESH: 'yui-pv-refresh',

    		/**
    		 * Classname for busy indicator in the dashboard.
    		 * @static
    		 * @property CLASS_BUSY
    		 * @type string
    		 * @public
    		 * @default "yui-pv-busy"
    		 */
    		CLASS_BUSY: 'yui-pv-busy',

    		/**
    		 * Classname for element containing the chart and chart
    		 * legend elements.
    		 * @static
    		 * @property CLASS_CHART_CONTAINER
    		 * @type string
    		 * @public
    		 * @default "yui-pv-chartcontainer"
    		 */
    		CLASS_CHART_CONTAINER: 'yui-pv-chartcontainer',

    		/**
    		 * Classname for element containing the chart.
    		 * @static
    		 * @property CLASS_CHART
    		 * @type string
    		 * @public
    		 * @default "yui-pv-chart"
    		 */
    		CLASS_CHART: 'yui-pv-chart',

    		/**
    		 * Classname for element containing the chart's legend.
    		 * @static
    		 * @property CLASS_CHART_LEGEND
    		 * @type string
    		 * @public
    		 * @default "yui-pv-chartlegend"
    		 */
    		CLASS_CHART_LEGEND: 'yui-pv-chartlegend',

    		/**
    		 * Classname for element containing the datatable.
    		 * @static
    		 * @property CLASS_TABLE
    		 * @type string
    		 * @public
    		 * @default "yui-pv-table"
    		 */
    		CLASS_TABLE: 'yui-pv-table',

    		/**
    		 * Strings used in the UI.
    		 * @static
    		 * @property STRINGS
    		 * @object
    		 * @public
    		 * @default English language strings for UI.
    		 */
    		STRINGS: {
    			title: "YUI ProfilerViewer",
    			buttons: {
    				viewprofiler: "View Profiler Data",
    				hideprofiler: "Hide Profiler Report",
    				showchart: "Show Chart",
    				hidechart: "Hide Chart",
    				refreshdata: "Refresh Data"
    			},
    			colHeads: {
    				//key: [column head label, width in pixels]
    				fn: ["Function/Method", null], //must auto-size
    				calls: ["Calls", 40],
    				avg: ["Average", 80],
    				min: ["Shortest", 70],
    				max: ["Longest", 70],
    				total: ["Total Time", 70],
    				pct: ["Percent", 70]
    			},
    			millisecondsAbbrev: "ms",
    			initMessage: "initialiazing chart...",
    			installFlashMessage: "Unable to load Flash content. The YUI Charts Control requires Flash Player 9.0.45 or higher. You can download the latest version of Flash Player from the <a href='http://www.adobe.com/go/getflashplayer'>Adobe Flash Player Download Center</a>."
    		},

    		/**
    		 * Function used to format numbers in milliseconds
    		 * for chart; must be publicly accessible, per Charts spec.
    		 * @static
    		 * @property timeAxisLabelFunction
    		 * @type function
    		 * @private
    		 */
    		timeAxisLabelFunction: function(n) {
    			var a = (n === Math.floor(n)) ? n : (Math.round(n*1000))/1000;
    			return (a + " " + YAHOO.widget.ProfilerViewer.STRINGS.millisecondsAbbrev);
    		},

    		/**
    		 * Function used to format percent numbers for chart; must
    		 * be publicly accessible, per Charts spec.
    		 * @static
    		 * @property percentAxisLabelFunction
    		 * @type function
    		 * @private
    		 */
    		percentAxisLabelFunction: function(n) {
    			var a = (n === Math.floor(n)) ? n : (Math.round(n*100))/100;
    			return (a + "%");
    		}

    	},true);

    	//
    	// STANDARD SHORTCUTS
    	//
        var Dom = YAHOO.util.Dom;
        var Event = YAHOO.util.Event;
    	var Profiler = YAHOO.tool.Profiler;
    	var PV = YAHOO.widget.ProfilerViewer;
    	var proto = PV.prototype;

    	//
    	// PUBLIC METHODS
    	//

    	 /**
         * Refreshes the data displayed in the ProfilerViewer. When called,
    	 * this will invoke a refresh of the DataTable and (if displayed)
    	 * the Chart.
         * @method refreshData
         * @return void
    	 * @public
         */
    	proto.refreshData = function() {
    		YAHOO.log("Data refresh requested via refreshData method.", "info", "ProfilerViewer");
    		this.fireEvent("dataRefreshEvent");
    	};

    	 /**
         * Returns the element containing the console's header.
         * @method getHeadEl
         * @return HTMLElement
    	 * @public
         */
    	proto.getHeadEl = function() {
    		YAHOO.log("Head element requested via getHeadEl.", "info", "ProfilerViewer");
    		return (this._headEl) ? Dom.get(this._headEl) : false;
    	};

    	 /**
         * Returns the element containing the console's body, including
    	 * the chart and the datatable..
         * @method getBodyEl
         * @return HTMLElement
    	 * @public
         */
    	proto.getBodyEl = function() {
    		YAHOO.log("Body element requested via getBodyEl.", "info", "ProfilerViewer");
    		return (this._bodyEl) ? Dom.get(this._bodyEl) : false;
    	};

    	 /**
         * Returns the element containing the console's chart.
         * @method getChartEl
         * @return HTMLElement
    	 * @public
         */
    	proto.getChartEl = function() {
    		YAHOO.log("Chart element requested via getChartEl.", "info", "ProfilerViewer");
    		return (this._chartEl) ? Dom.get(this._chartEl) : false;
    	};

    	 /**
         * Returns the element containing the console's dataTable.
         * @method getTableEl
         * @return HTMLElement
    	 * @public
         */
    	proto.getTableEl = function() {
    		YAHOO.log("DataTable element requested via getTableEl.", "info", "ProfilerViewer");
    		return (this._tableEl) ? Dom.get(this._tableEl) : false;
    	};

    	 /**
         * Returns the element containing the console's DataTable
    	 * instance.
         * @method getDataTable
         * @return YAHOO.widget.DataTable
    	 * @public
         */
    	proto.getDataTable = function() {
    		YAHOO.log("DataTable instance requested via getDataTable.", "info", "ProfilerViewer");
    		return this._dataTable;
    	};

    	 /**
         * Returns the element containing the console's Chart instance.
         * @method getChart
         * @return YAHOO.widget.BarChart
    	 * @public
         */
    	proto.getChart = function() {
    		YAHOO.log("Chart instance requested via getChart.", "info", "ProfilerViewer");
    		return this._chart;
    	};

        //
        // PRIVATE PROPERTIES
        //
        proto._rendered = false;
    	proto._headEl = null;
    	proto._bodyEl = null;
    	proto._toggleVisibleEl = null;
    	proto._busyEl = null;
    	proto._busy = false;

    	proto._tableEl = null;
    	proto._dataTable = null;

    	proto._chartEl = null;
    	proto._chartLegendEl = null;
    	proto._chartElHeight = 250;
    	proto._chart = null;
    	proto._chartInitialized = false;

        //
        // PRIVATE METHODS
        //

    	proto._init = function() {
    		/**
    		 * CUSTOM EVENTS
    		 **/

    		/**
    		 * Fired when a data refresh is requested. No arguments are passed
    		 * with this event.
    		 *
    		 * @event refreshDataEvent
    		 */
    		this.createEvent("dataRefreshEvent");

    		/**
    		 * Fired when the viewer canvas first renders. No arguments are passed
    		 * with this event.
    		 *
    		 * @event renderEvent
    		 */
    		this.createEvent("renderEvent");

    		this.on("dataRefreshEvent", this._refreshDataTable, this, true);

    		this._initLauncherDOM();

    		if(this.get("showChart")) {
    			this.on("sortedByChange", this._refreshChart);
    		}

    		YAHOO.log("ProfilerViewer instance initialization complete.", "info", "ProfilerViewer");
    	};

    	/**
    	 * If no element is passed in, create it as the first element
    	 * in the document.
    	 * @method _createProfilerViewerElement
    	 * @return HTMLElement
    	 * @private
    	 */
    	proto._createProfilerViewerElement = function() {
    		YAHOO.log("Creating root element...", "info", "ProfilerViewer");

    		var el = document.createElement("div");
    		document.body.insertBefore(el, document.body.firstChild);
    		Dom.addClass(el, this.SKIN_CLASS);
    		Dom.addClass(el, PV.CLASS);
    		YAHOO.log(el);
    		return el;
    	};

        /**
         * Provides a readable name for the ProfilerViewer instance.
         * @method toString
         * @return String
    	 * @private
    	 */
        proto.toString = function() {
            return "ProfilerViewer " + (this.get('id') || this.get('tagName'));
        };

        /**
         * Toggles visibility of the viewer canvas.
         * @method _toggleVisible
         * @return void
    	 * @private
         */
    	proto._toggleVisible = function() {
    		YAHOO.log("Toggling visibility to " + !this.get("visible") + ".", "info", "ProfilerViewer");

    		var newVis = (this.get("visible")) ? false : true;
    		this.set("visible", newVis);
        };

        /**
         * Shows the viewer canvas.
         * @method show
         * @return void
    	 * @private
         */
    	 proto._show = function() {
    	 	if(!this._busy) {
    			this._setBusyState(true);
    			if(!this._rendered) {
    				var loader = new YAHOO.util.YUILoader();
    				if (this.get("base")) {
    					loader.base = this.get("base");
    				}

    				var modules = ["datatable"];
    				if(this.get("showChart")) {
    					modules.push("charts");
    				}

    				loader.insert({ require: modules,
    								onSuccess: function() {
    									this._render();
    								},
    								scope: this});
    			} else {
    				var el = this.get("element");
    				Dom.removeClass(el, "yui-pv-minimized");
    				this._toggleVisibleEl.innerHTML = PV.STRINGS.buttons.hideprofiler;

    				//The Flash Charts component can't be set to display:none,
    				//and even after positioning it offscreen the screen
    				//may fail to repaint in some browsers.  Adding an empty
    				//style rule to the console body can help force a repaint:
    				Dom.addClass(el, "yui-pv-null");
    				Dom.removeClass(el, "yui-pv-null");

    				//Always refresh data when changing to visible:
    				this.refreshData();
    			}
    		}
        };

        /**
         * Hides the viewer canvas.
         * @method hide
         * @return void
    	 * @private
         */
    	proto._hide = function() {
    		this._toggleVisibleEl.innerHTML = PV.STRINGS.buttons.viewprofiler;
    		Dom.addClass(this.get("element"), "yui-pv-minimized");
        };

    	/**
    	 * Render the viewer canvas
    	 * @method _render
    	 * @return void
    	 * @private
    	 */
    	proto._render = function() {
    		YAHOO.log("Beginning to render ProfilerViewer canvas...", "info", "ProfilerViewer");

    		Dom.removeClass(this.get("element"), "yui-pv-minimized");

    		this._initViewerDOM();
    		this._initDataTable();
    		if(this.get("showChart")) {
    			this._initChartDOM();
    			this._initChart();
    		}
    		this._rendered = true;
    		this._toggleVisibleEl.innerHTML = PV.STRINGS.buttons.hideprofiler;

    		this.fireEvent("renderEvent");

    		YAHOO.log("ProfilerViewer rendering complete...", "info", "ProfilerViewer");
    	};

    	/**
    	 * Set up the DOM structure for the ProfilerViewer launcher.
    	 * @method _initLauncherDOM
    	 * @private
    	 */
    	proto._initLauncherDOM = function() {
    		YAHOO.log("Creating the launcher...", "info", "ProfilerViewer");

    		var el = this.get("element");
    		Dom.addClass(el, PV.CLASS);
    		Dom.addClass(el, "yui-pv-minimized");

    		this._headEl = document.createElement("div");
    		Dom.addClass(this._headEl, "hd");

    		var s = PV.STRINGS.buttons;
    		var b = (this.get("visible")) ? s.hideprofiler : s.viewprofiler;

    		this._toggleVisibleEl = this._createButton(b, this._headEl);

    		this._refreshEl = this._createButton(s.refreshdata, this._headEl);
    		Dom.addClass(this._refreshEl, PV.CLASS_REFRESH);

    		this._busyEl = document.createElement("span");
    		this._headEl.appendChild(this._busyEl);

    		var title = document.createElement("h4");
    		title.innerHTML = PV.STRINGS.title;
    		this._headEl.appendChild(title);

    		el.appendChild(this._headEl);

    		Event.on(this._toggleVisibleEl, "click", this._toggleVisible, this, true);
    		Event.on(this._refreshEl, "click", function() {
    			if(!this._busy) {
    				this._setBusyState(true);
    				this.fireEvent("dataRefreshEvent");
    			}
    		}, this, true);
    	};

    	/**
    	 * Set up the DOM structure for the ProfilerViewer canvas,
    	 * including the holder for the DataTable.
    	 * @method _initViewerDOM
    	 * @private
    	 */
    	proto._initViewerDOM = function() {
    		YAHOO.log("Creating DOM structure for viewer...", "info", "ProfilerViewer");

    		var el = this.get("element");
    		this._bodyEl = document.createElement("div");
    		Dom.addClass(this._bodyEl, "bd");
    	 	this._tableEl = document.createElement("div");
    		Dom.addClass(this._tableEl, PV.CLASS_TABLE);
    		this._bodyEl.appendChild(this._tableEl);
    		el.appendChild(this._bodyEl);
    	};

    	/**
    	 * Set up the DOM structure for the ProfilerViewer canvas.
    	 * @method _initChartDOM
    	 * @private
    	 */
    	proto._initChartDOM = function() {
    		YAHOO.log("Adding DOM structure for chart...", "info", "ProfilerViewer");

    		this._chartContainer = document.createElement("div");
    		Dom.addClass(this._chartContainer, PV.CLASS_CHART_CONTAINER);

    		var chl = document.createElement("div");
    		Dom.addClass(chl, PV.CLASS_CHART_LEGEND);

    		var chw = document.createElement("div");

    		this._chartLegendEl = document.createElement("dl");
    		this._chartLegendEl.innerHTML = "<dd>" + PV.STRINGS.initMessage + "</dd>";

    		this._chartEl = document.createElement("div");
    		Dom.addClass(this._chartEl, PV.CLASS_CHART);

    		var msg = document.createElement("p");
    		msg.innerHTML = PV.STRINGS.installFlashMessage;
    		this._chartEl.appendChild(msg);

    		this._chartContainer.appendChild(chl);
    		chl.appendChild(chw);
    		chw.appendChild(this._chartLegendEl);
    		this._chartContainer.appendChild(this._chartEl);
    		this._bodyEl.insertBefore(this._chartContainer,this._tableEl);
    	};

    	/**
    	 * Create anchor elements for use as buttons. Args: label
    	 * is text to appear on the face of the button, parentEl
    	 * is the el to which the anchor will be attached, position
    	 * is true for inserting as the first node and false for
    	 * inserting as the last node of the parentEl.
    	 * @method _createButton
    	 * @private
    	 */
    	proto._createButton = function(label, parentEl, position) {
    		var b = document.createElement("a");
    		b.innerHTML = b.title = label;
    		if(parentEl) {
    			if(!position) {
    				parentEl.appendChild(b);
    			} else {
    				parentEl.insertBefore(b, parentEl.firstChild);
    			}
    		}
    		return b;
    	};

    	/**
    	 * Set's console busy state.
    	 * @method _setBusyState
    	 * @private
    	 **/
    	proto._setBusyState = function(b) {
    		if(b) {
    			Dom.addClass(this._busyEl, PV.CLASS_BUSY);
    			this._busy = true;
    		} else {
    			Dom.removeClass(this._busyEl, PV.CLASS_BUSY);
    			this._busy = false;
    		}
    	};

    	/**
    	 * Generages a sorting function based on current sortedBy
    	 * values.
    	 * @method _createProfilerViewerElement
    	 * @private
    	 **/
    	proto._genSortFunction = function(key, dir) {
    		var by = key;
    		var direction = dir;
    		return function(a, b) {
    			if (direction == YAHOO.widget.DataTable.CLASS_ASC) {
    				return a[by] - b[by];
    			} else {
    				return ((a[by] - b[by]) * -1);
    			}
    		};
    	};

    	/**
    	 * Utility function for array sums.
    	 * @method _arraySum
    	 * @private
    	 **/
    	 var _arraySum = function(arr){
    		var ct = 0;
    		for(var i = 0; i < arr.length; ct+=arr[i++]){}
    		return ct;
    	};

    	/**
    	 * Retrieves data from Profiler, filtering and sorting as needed
    	 * based on current widget state.  Adds calculated percentage
    	 * column and function name to data returned by Profiler.
    	 * @method _getProfilerData
    	 * @private
    	 **/
    	proto._getProfilerData = function() {
    		YAHOO.log("Profiler data requested from function DataSource.", "info", "ProfilerViewer");

    		var obj = Profiler.getFullReport();
    		var arr = [];
    		var totalTime = 0;
    		for (name in obj) {
        		if (YAHOO.lang.hasOwnProperty(obj, name)) {
    				var r = obj[name];
    				var o = {};
    				o.fn = name; //add function name to record
    				o.points = r.points.slice(); //copy live array
    				o.calls = r.calls;
    				o.min = r.min;
    				o.max = r.max;
    				o.avg = r.avg;
    				o.total = _arraySum(o.points);
    				o.points = r.points;
    				var f = this.get("filter");
    				if((!f) || (f(o))) {
    					arr.push(o);
    					totalTime += o.total;
    				}
    			}
    		}

    		//add calculated percentage column
    		for (var i = 0, j = arr.length; i < j; i++) {
    			arr[i].pct = (totalTime) ? (arr[i].total * 100) / totalTime : 0;
    		}

    		var sortedBy = this.get("sortedBy");
    		var key = sortedBy.key;
    		var dir = sortedBy.dir;

    		arr.sort(this._genSortFunction(key, dir));

    		YAHOO.log("Returning data from DataSource: " + YAHOO.lang.dump(arr), "info", "ProfilerViewer");

    		return arr;
    	};

    	/**
    	 * Set up the DataTable.
    	 * @method _initDataTable
    	 * @private
    	 */
    	proto._initDataTable = function() {
    		YAHOO.log("Creating DataTable instance...", "info", "ProfilerViewer");

    		var self = this;

    		//Set up the JS Function DataSource, pulling data from
    		//the Profiler.
    		this._dataSource = new YAHOO.util.DataSource(
    			function() {
    				return self._getProfilerData.call(self);
    			},
    			{
    				responseType: YAHOO.util.DataSource.TYPE_JSARRAY,
    				maxCacheEntries: 0
    			}
    		);
    		var ds = this._dataSource;

    		ds.responseSchema =
    		{
    			fields: [ "fn", "avg", "calls", "max", "min", "total", "pct", "points"]
    		};

    		//Set up the DataTable.
    		var formatTimeValue = function(elCell, oRecord, oColumn, oData) {
    			var a = (oData === Math.floor(oData)) ? oData : (Math.round(oData*1000))/1000;
    			elCell.innerHTML = a + " " + PV.STRINGS.millisecondsAbbrev;
    		};

    		var formatPercent = function(elCell, oRecord, oColumn, oData) {
    			var a = (oData === Math.floor(oData)) ? oData : (Math.round(oData*100))/100;
    			elCell.innerHTML = a + "%";
    		};

    		var a = YAHOO.widget.DataTable.CLASS_ASC;
    		var d = YAHOO.widget.DataTable.CLASS_DESC;
    		var c = PV.STRINGS.colHeads;
    		var f = formatTimeValue;

    		var cols = [
    			{key:"fn", sortable:true, label: c.fn[0],
    				sortOptions: {defaultDir:a},
    				resizeable: (YAHOO.util.DragDrop) ? true : false,
    				minWidth:c.fn[1]},
    			{key:"calls", sortable:true, label: c.calls[0],
    				sortOptions: {defaultDir:d},
    				width:c.calls[1]},
    			{key:"avg", sortable:true, label: c.avg[0],
    				sortOptions: {defaultDir:d},
    				formatter:f,
    				width:c.avg[1]},
    			{key:"min", sortable:true, label: c.min[0],
    				sortOptions: {defaultDir:a},
    				formatter:f,
    				width:c.min[1]},
    			{key:"max", sortable:true, label: c.max[0],
    				sortOptions: {defaultDir:d},
    				formatter:f,
    				width:c.max[1]},
    			{key:"total", sortable:true, label: c.total[0],
    				sortOptions: {defaultDir:d},
    				formatter:f,
    				width:c.total[1]},
    			{key:"pct", sortable:true, label: c.pct[0],
    				sortOptions: {defaultDir:d},
    				formatter:formatPercent,
    				width:c.pct[1]}
    		];

    		this._dataTable = new YAHOO.widget.DataTable(this._tableEl, cols, ds, {
    			scrollable:true,
    			height:this.get("tableHeight"),
    			initialRequest:null,
    			sortedBy: {
    				key: "total",
    				dir: YAHOO.widget.DataTable.CLASS_DESC
    			}
    		});
    		var dt = this._dataTable;

    		//Wire up DataTable events to drive the rest of the UI.
    		dt.subscribe("sortedByChange", this._sortedByChange, this, true);
    		dt.subscribe("renderEvent", this._dataTableRenderHandler, this, true);
    		dt.subscribe("initEvent", this._dataTableRenderHandler, this, true);
    		Event.on(this._tableEl.getElementsByTagName("th"), "click", this._thClickHandler, this, true);
    		YAHOO.log("DataTable initialized.", "info", "ProfilerViewer");
    	};

    	/**
    	 * Proxy the sort event in DataTable into the ProfilerViewer
    	 * attribute.
    	 * @method _sortedByChange
    	 * @private
    	 **/
    	proto._sortedByChange = function(o) {
    		if(o.newValue && o.newValue.key) {
    			YAHOO.log("Relaying DataTable sortedBy value change; new key: " + o.newValue.key + "; new direction: " + o.newValue.dir + ".", "info", "ProfilerViewer");
    			this.set("sortedBy", {key: o.newValue.key, dir:o.newValue.dir});
    		}
    	};

    	/**
    	 * Proxy the render event in DataTable into the ProfilerViewer
    	 * attribute.
    	 * @method _dataTableRenderHandler
    	 * @private
    	 **/
    	proto._dataTableRenderHandler = function(o) {
    		YAHOO.log("DataTable's render event has fired.", "info", "ProfilerViewer");
    		this._setBusyState(false);
    	};

    	/**
    	 * Event handler for clicks on the DataTable's sortable column
    	 * heads.
    	 * @method _thClickHandler
    	 * @private
    	 **/
    	proto._thClickHandler = function(o) {
    		YAHOO.log("DataTable's header row was clicked for sorting.", "info", "ProfilerViewer");
    		this._setBusyState(true);
    	};

    	/**
    	 * Refresh DataTable, getting new data from Profiler.
    	 * @method _refreshDataTable
    	 * @private
    	 **/
    	proto._refreshDataTable = function(args) {
    		YAHOO.log("Beginning to refresh DataTable contents...", "info", "ProfilerViewer");
    		var dt = this._dataTable;
    		dt.getDataSource().sendRequest("", dt.onDataReturnInitializeTable, dt);
    		YAHOO.log("DataTable refresh complete.", "info", "ProfilerViewer");
    	};

    	/**
    	 * Refresh chart, getting new data from table.
    	 * @method _refreshChart
    	 * @private
    	 **/
    	proto._refreshChart = function() {
    		YAHOO.log("Beginning to refresh Chart contents...", "info", "ProfilerViewer");

    		switch (this.get("sortedBy").key) {
    			case "fn":
    				/*Keep the same data on the chart, but force update to
    				  reflect new sort order on function/method name: */
    				this._chart.set("dataSource", this._chart.get("dataSource"));
    				/*no further action necessary; chart redraws*/
    				return;
    			case "calls":
    				/*Null out the xAxis formatting before redrawing chart.*/
    				this._chart.set("xAxis", this._chartAxisDefinitionPlain);
    				break;
    			case "pct":
    				this._chart.set("xAxis", this._chartAxisDefinitionPercent);
    				break;
    			default:
    				/*Set the default xAxis; redraw legend; set the new series definition.*/
    				this._chart.set("xAxis", this._chartAxisDefinitionTime);
    				break;
    		}

    		this._drawChartLegend();
    		this._chart.set("series", this._getSeriesDef(this.get("sortedBy").key));

    		YAHOO.log("Chart refresh complete.", "info", "ProfilerViewer");
    	};

    	/**
    	 * Get data for the Chart from DataTable recordset
    	 * @method _getChartData
    	 * @private
    	 */
    	proto._getChartData = function() {
    		YAHOO.log("Getting data for chart from function DataSource.", "info", "ProfilerViewer");
    		//var records = this._getProfilerData();
    		var records = this._dataTable.getRecordSet().getRecords(0, this.get("maxChartFunctions"));
    		var arr = [];
    		for (var i = 0, j = records.length; i<j; i++) {
    			arr.push(records[i].getData());
    		}
    		YAHOO.log("Returning data to Chart: " + YAHOO.lang.dump(arr), "info", "ProfilerViewer");
    		return arr;
    	};

    	/**
    	 * Build series definition based on current configuration attributes.
    	 * @method _getSeriesDef
    	 * @private
    	 */
    	proto._getSeriesDef = function(field) {
    		var sd = this.get("chartSeriesDefinitions")[field];
    		var arr = [];
    		for(var i = 0, j = sd.group.length; i<j; i++) {
    			var c = this.get("chartSeriesDefinitions")[sd.group[i]];
    			arr.push(
    				{displayName:c.displayName,
    				 xField:c.xField,
    				 style: {color:c.style.color, size:c.style.size}
    				}
    			);
    		}

    		YAHOO.log("Returning new series definition to chart: " + YAHOO.lang.dump(arr), "info", "ProfilerViewer");
    		return arr;
    	};

    	/**
    	 * Set up the Chart.
    	 * @method _initChart
    	 * @private
    	 */
    	proto._initChart = function() {
    		YAHOO.log("Initializing chart...", "info", "ProfilerViewer");

    		this._sizeChartCanvas();

    		YAHOO.widget.Chart.SWFURL = this.get("swfUrl");

    		var self = this;

    		//Create DataSource based on records currently displayed
    		//at the top of the sort list in the DataTable.
    		var ds = new YAHOO.util.DataSource(
    			//force the jsfunction DataSource to run in the scope of
    			//the ProfilerViewer, not in the YAHOO.util.DataSource scope:
    			function() {
    				return self._getChartData.call(self);
    			},
    			{
    				responseType: YAHOO.util.DataSource.TYPE_JSARRAY,
    				maxCacheEntries: 0
    			}
    		);

    		ds.responseSchema =
    		{
    			fields: [ "fn", "avg", "calls", "max", "min", "total", "pct" ]
    		};

    		ds.subscribe('responseEvent', this._sizeChartCanvas, this, true);

    		//Set up the chart itself.
    		this._chartAxisDefinitionTime = new YAHOO.widget.NumericAxis();
    		this._chartAxisDefinitionTime.labelFunction = "YAHOO.widget.ProfilerViewer.timeAxisLabelFunction";

    		this._chartAxisDefinitionPercent = new YAHOO.widget.NumericAxis();
    		this._chartAxisDefinitionPercent.labelFunction = "YAHOO.widget.ProfilerViewer.percentAxisLabelFunction";

    		this._chartAxisDefinitionPlain = new YAHOO.widget.NumericAxis();

    		this._chart = new YAHOO.widget.BarChart( this._chartEl, ds,
    		{
    			yField: "fn",
    			series: this._getSeriesDef(this.get("sortedBy").key),
    			style: this.get("chartStyle"),
    			xAxis: this._chartAxisDefinitionTime
    		} );

    		this._drawChartLegend();
    		this._chartInitialized = true;
    		this._dataTable.unsubscribe("initEvent", this._initChart, this);
    		this._dataTable.subscribe("initEvent", this._refreshChart, this, true);

    		YAHOO.log("Chart initialization complete.", "info", "ProfilerViewer");
    	};

    	/**
    	 * Set up the Chart's legend
    	 * @method _drawChartLegend
    	 * @private
    	 **/
    	proto._drawChartLegend = function() {
    		YAHOO.log("Drawing chart legend...", "info", "ProfilerViewer");
    		var seriesDefs = this.get("chartSeriesDefinitions");
    		var currentDef = seriesDefs[this.get("sortedBy").key];
    		var l = this._chartLegendEl;
    		l.innerHTML = "";
    		for(var i = 0, j = currentDef.group.length; i<j; i++) {
    			var c = seriesDefs[currentDef.group[i]];
    			var dt = document.createElement("dt");
    			Dom.setStyle(dt, "backgroundColor", "#" + c.style.color);
    			var dd = document.createElement("dd");
    			dd.innerHTML = c.displayName;
    			l.appendChild(dt);
    			l.appendChild(dd);
    		}
    	};

    	/**
    	 * Resize the chart's canvas if based on number of records
    	 * returned from the chart's datasource.
    	 * @method _sizeChartCanvas
    	 * @private
    	 **/
    	proto._sizeChartCanvas = function(o) {
    		YAHOO.log("Resizing chart canvas...", "info", "ProfilerViewer");
    		var bars = (o) ? o.response.length : this.get("maxChartFunctions");
    		var s = (bars * 36) + 34;
    		if (s != parseInt(this._chartElHeight, 10)) {
    			this._chartElHeight = s;
    			Dom.setStyle(this._chartEl, "height", s + "px");
    		}
    	};

        /**
         * setAttributeConfigs TabView specific properties.
         * @method initAttributes
         * @param {Object} attr Hash of initial attributes
    	 * @method initAttributes
    	 * @private
         */
        proto.initAttributes = function(attr) {
    		YAHOO.log("Initializing attributes...", "info", "ProfilerViewer");
            YAHOO.widget.ProfilerViewer.superclass.initAttributes.call(this, attr);
            /**
             * The YUI Loader base path from which to pull YUI files needed
    		 * in the rendering of the ProfilerViewer canvas.  Passed directly
    		 * to YUI Loader.  Leave blank to draw files from
    		 * yui.yahooapis.com.
             * @attribute base
             * @type string
    		 * @default ""
             */
            this.setAttributeConfig('base', {
                value: attr.base
            });

            /**
             * The height of the DataTable.  The table will scroll
    		 * vertically if the content overflows the specified
    		 * height.
             * @attribute tableHeight
             * @type string
    		 * @default "15em"
             */
            this.setAttributeConfig('tableHeight', {
                value: attr.tableHeight || "15em",
    			method: function(s) {
    				if(this._dataTable) {
    					this._dataTable.set("height", s);
    				}
    			}
            });

            /**
             * The default column key to sort by.  Valid keys are: fn, calls,
    		 * avg, min, max, total.  Valid dir values are:
    		 * YAHOO.widget.DataTable.CLASS_ASC and
    		 * YAHOO.widget.DataTable.CLASS_DESC (or their
    		 * string equivalents).
             * @attribute sortedBy
             * @type string
    		 * @default {key:"total", dir:"yui-dt-desc"}
             */
            this.setAttributeConfig('sortedBy', {
                value: attr.sortedBy || {key:"total", dir:"yui-dt-desc"}
            });

            /**
             * A filter function to use in selecting functions that will
    		 * appear in the ProfilerViewer report.  The function is passed
    		 * a function report object and should return a boolean indicating
    		 * whether that function should be included in the ProfilerViewer
    		 * display.  The argument is structured as follows:
    		 *
    		 * {
    		 *	 	fn: <str function name>,
    		 *		calls : <n number of calls>,
    		 *		avg : <n average call duration>,
    		 *		max: <n duration of longest call>,
    		 *		min: <n duration of shortest call>,
    		 *		total: <n total time of all calls>
    		 *		points : <array time in ms of each call>
    		 *	}
    		 *
    		 * For example, you would use the follwing filter function to
    		 * return only functions that have been called at least once:
    		 *
    		 * 	function(o) {
    		 *		return (o.calls > 0);
    		 *	}
    		 *
             * @attribute filter
             * @type function
    		 * @default null
             */
            this.setAttributeConfig('filter', {
                value: attr.filter || null,
    			validator: YAHOO.lang.isFunction
            });

    		/**
    		 * The path to the YUI Charts swf file; must be a full URI
    		 * or a path relative to the page being profiled. Changes at runtime
    		 * not supported; pass this value in at instantiation.
    		 * @attribute swfUrl
    		 * @type string
    		 * @default "http://yui.yahooapis.com/2.5.0/build/charts/assets/charts.swf"
    		 */
    		this.setAttributeConfig('swfUrl', {
    			value: attr.swfUrl || "http://yui.yahooapis.com/2.5.0/build/charts/assets/charts.swf"
    		});

            /**
             * The maximum number of functions to profile in the chart. The
    		 * greater the number of functions, the greater the height of the
    		 * chart canvas.
    		 * height.
             * @attribute maxChartFunctions
             * @type int
    		 * @default 6
             */
            this.setAttributeConfig('maxChartFunctions', {
                value: attr.maxChartFunctions || 6,
    			method: function(s) {
    				if(this._rendered) {
    					this._sizeChartCanvas();
    				}
    			},
    			validator: YAHOO.lang.isNumber
            });

            /**
             * The style object that defines the chart's visual presentation.
    		 * Conforms to the style attribute passed to the Charts Control
    		 * constructor.  See Charts Control User's Guide for more information
    		 * on how to format this object.
             * @attribute chartStyle
             * @type obj
    		 * @default See JS source for default definitions.
             */
            this.setAttributeConfig('chartStyle', {
                value: 	attr.chartStyle || {
    				font:
    					{
    						name: "Arial",
    						color: 0xeeee5c,
    						size: 12
    					},
    					background:
    					{
    						color: "6e6e63"
    					}
    				},
    			method: function() {
    					if(this._rendered && this.get("showChart")) {
    						this._refreshChart();
    					}
    				}
            });

            /**
             * The series definition information to use when charting
    		 * specific fields on the chart.  displayName, xField,
    		 * and style members are used to construct the series
    		 * definition; the "group" member is the array of fields
    		 * that should be charted when the table is sorted by a
    		 * given field.
             * @attribute chartSeriesDefinitions
             * @type obj
    		 * @default See JS source for full default definitions.
             */
            this.setAttributeConfig('chartSeriesDefinitions', {
                value: 	attr.chartSeriesDefinitions ||  {
    						total: {
    							displayName: PV.STRINGS.colHeads.total[0],
    							xField: "total",
    							style: {color:"4d95dd", size:20},
    							group: ["total"]
    						},
    						calls: {
    							displayName: PV.STRINGS.colHeads.calls[0],
    							xField: "calls",
    							style: {color:"edff9f", size:20},
    							group: ["calls"]
    						},
    						avg: {
    							displayName: PV.STRINGS.colHeads.avg[0],
    							xField: "avg",
    							style: {color:"209daf", size:9},
    							group: ["avg", "min", "max"]
    						},
    						min: {
    							displayName: PV.STRINGS.colHeads.min[0],
    							xField: "min",
    							style: {color:"b6ecf4", size:9},
    							group: ["avg", "min", "max"]
    						},
    						max: {
    							displayName: PV.STRINGS.colHeads.max[0],
    							xField: "max",
    							style: {color:"29c7de", size:9},
    							group: ["avg", "min", "max"]
    						},
    						pct: {
    							displayName: PV.STRINGS.colHeads.pct[0],
    							xField: "pct",
    							style: {color:"C96EDB", size:20},
    							group: ["pct"]
    						}
    				},
    			method: function() {
    					if(this._rendered && this.get("showChart")) {
    						this._refreshChart();
    					}
    				}
            });

            /**
             * The default visibility setting for the viewer canvas. If true,
    		 * the viewer will load all necessary files and render itself
    		 * immediately upon instantiation; otherwise, the viewer will
    		 * load only minimal resources until the user toggles visibility
    		 * via the UI.
             * @attribute visible
             * @type boolean
    		 * @default false
             */
            this.setAttributeConfig('visible', {
                value: attr.visible || false,
    			validator: YAHOO.lang.isBoolean,
    			method: function(b) {
    				if(b) {
    					this._show();
    				} else {
    					if (this._rendered) {
    						this._hide();
    					}
    				}
    			}
            });

            /**
             * The default visibility setting for the chart.
             * @attribute showChart
             * @type boolean
    		 * @default true
             */
            this.setAttributeConfig('showChart', {
                value: attr.showChart || true,
    			validator: YAHOO.lang.isBoolean,
    			writeOnce: true

            });

    		YAHOO.widget.ProfilerViewer.superclass.initAttributes.call(this, attr);

    		YAHOO.log("Attributes initialized.", "info", "ProfilerViewer");
        };

    })();

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