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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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	<title>YUI Library Examples: Charts Control: Apply scope to label functions</title>
    

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	<div id="pagetitle"><h1>YUI Library Examples: Charts Control: Apply scope to label functions</h1></div>
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			  <div class="yui-u first example">

    
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	<h1>Charts Control: Apply scope to label functions</h1>
	
	<div class="exampleIntro">
	<p>A <a href="http://developer.yahoo.com/yui/charts/">YUI Charts Control</a> and a <a href="http://developer.yahoo.com/yui/datatable/">DataTable Control</a> may share a <a href="http://developer.yahoo.com/yui/datasource/">DataSource</a> to display the same data.</p>
<p>Please note: The YUI Charts Control requires Flash Player 9.0.45 or higher. The latest version of Flash Player is available at the <a href="http://www.adobe.com/go/getflashplayer">Adobe Flash Player Download Center</a>.</p>			
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			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="charts-functionscope_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<span class="chart_title">Personal Expenses</span>
<div id="chart">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>.</p></div>

<script type="text/javascript">

	YAHOO.widget.Chart.SWFURL = "../../build/charts/assets/charts.swf";

	var CustomGraph = function()
	{
		this.text = "*************************************";
		this.chart;
		this.dataTipFunction = CustomGraph.prototype.dataTipFunction;
		this.monthlyExpenses =
		[
			{ month: "January", car: 265.35, power:60.00, cable:101.45, entertainment:304.33},
			{ month: "February", car: 265.35, power:65.00, cable:123.87, entertainment:255.65},
			{ month: "March", car: 265.35, power:75.34, cable:101.45, entertainment:284.85},
			{ month: "April", car: 265.35, power:88.45, cable:115.64, entertainment:245.90},
			{ month: "May", car: 265.35, power:98.47, cable:101.45, entertainment:265.34},
			{ month: "June", car: 265.35, power:101.35, cable:108.64, entertainment:301.23}
		];	
		this.styleDefinition =
		{
			font:{color:0x663333},
			background:{color:0xDCAD70},
			border:{color:0x663333, size:2},
			xAxis:{color:0x663333},
			yAxis:{color:0x663333, minorTicks:{display:"none"}, majorTicks:{display:"none"}, majorGridLines:{color:0x663333}}
			
		}
	}
	
	CustomGraph.prototype.getDataSource = function()
	{
		var myDataSource = new YAHOO.util.DataSource( this.monthlyExpenses );
		myDataSource.responseType = YAHOO.util.DataSource.TYPE_JSARRAY;
		myDataSource.responseSchema =
		{
			fields: [ "month", "car", "power", "entertainment", "cable" ]
		};
		return myDataSource;	
	}
	
	CustomGraph.prototype.formatCurrencyAxisLabel = function( value )
	{
		return this.numberToCurrency(value);
	}

	CustomGraph.prototype.numberToCurrency = function(value)
	{
		return YAHOO.util.Number.format( value,
		{
			prefix: "$",
			thousandsSeparator: ",",
			decimalPlaces: 2
		});	
	}		

	CustomGraph.prototype.fixedExpensesDataTipFunction = function(item, index, series)
	{
		var toolTipText = this.text;
		toolTipText += "\n" + series.displayName + " payment for " + item.month;
		toolTipText += "\n" + this.formatCurrencyAxisLabel( item[series.yField] );
		toolTipText += "\n" + this.text;
		return toolTipText;	
	}

	CustomGraph.prototype.dataTipFunction = function( item, index, series )
	{
		var expense = series.yField;
		var num = item[expense];
		return this.getDataTipText(expense, item.month, num);
	}
	
	CustomGraph.prototype.getDataTipText = function(expense, month, amount)
	{
		var toolTipText = this.text;
		toolTipText += "\nYour " + month + " " + expense;
		var limit;
		switch(expense)
		{
			case "entertainment" :
				toolTipText += " expenses are";
				toolTipText += amount <= 300 ? "\n in an acceptable range: \n" : "\n  too high. \nGo out less:\n";
			break;
			case "cable" :
				toolTipText += " bill is";
				toolTipText += amount <= 110 ? "\n in an acceptable range: \n" : "\n  too high. \nOrder less movies:\n";
			break;
			case "power" :
				toolTipText += " bill is";
				toolTipText += amount <= 80 ? "\n in an acceptable range: \n" : "\n too high. \nTurn down your AC:\n";
			break;
			
		}
		toolTipText += this.formatCurrencyAxisLabel(amount);
		toolTipText += "\n" + this.text;
		
		return toolTipText;
	}

	CustomGraph.prototype.getVerticalAxis = function()
	{
		var currencyAxis = new YAHOO.widget.NumericAxis();
		currencyAxis.alwaysShowZero = false;
		currencyAxis.labelFunction = {func:this.formatCurrencyAxisLabel, scope:this};	

		return currencyAxis;
	}
	
	CustomGraph.prototype.getSeriesDefs = function()
	{
		var seriesDef =
		[
			{ 
				displayName: "Car", 
				yField: "car", 
				style:{skin:"DiamondSkin", color:0x006600},
				dataTipFunction:{func:this.fixedExpensesDataTipFunction, scope:this}
			 },
			{ 	
				displayName: "power", 
				yField: "power", 
				style:{color:0x8899dd}
			},
			{
				displayName: "Cable",
				yField: "cable",
				style:{color:0xee6600}
			},
			{
				displayName: "Entertainment",
				yField: "entertainment",
				style:{color:0x6e5000}
			}
		];	

		return seriesDef;
	}
	
	CustomGraph.prototype.drawChart = function(myDiv)
	{
		var myAtts = {xField:"month", version:9.28};
		myAtts.dataTipFunction = {func:this.dataTipFunction, scope:this};
		myAtts.series = this.getSeriesDefs();
		myAtts.yAxis = this.getVerticalAxis();
		myAtts.style = this.styleDefinition;
		this.chart = new YAHOO.widget.LineChart(myDiv, this.getDataSource(), myAtts);
	}	
	
	var myGraph = new CustomGraph();
	myGraph.drawChart("chart");
	

</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">Create Custom Graph Class</h2>

<p>We will start by creating a custom class to contain all the necessary elements required to render a chart.</p>

<textarea name="code" class="JScript" cols="60" rows="10">
	var CustomGraph = function()
	{
		this.text = "*************************************";
		this.chart;
		this.dataTipFunction = CustomGraph.prototype.dataTipFunction;
		this.monthlyExpenses =
		[
			{ month: "January", car: 265.35, power:60.00, cable:101.45, entertainment:304.33},
			{ month: "February", car: 265.35, power:65.00, cable:123.87, entertainment:255.65},
			{ month: "March", car: 265.35, power:75.34, cable:101.45, entertainment:284.85},
			{ month: "April", car: 265.35, power:88.45, cable:115.64, entertainment:245.90},
			{ month: "May", car: 265.35, power:98.47, cable:101.45, entertainment:265.34},
			{ month: "June", car: 265.35, power:101.35, cable:108.64, entertainment:301.23}
		];	
		this.styleDefinition =
		{
			font:{color:0x663333},
			background:{color:0xDCAD70},
			border:{color:0x663333, size:2},
			xAxis:{color:0x663333},
			yAxis:{color:0x663333, minorTicks:{display:"none"}, majorTicks:{display:"none"}, majorGridLines:{color:0x663333}}
			
		}
	}
	
	CustomGraph.prototype.getDataSource = function()
	{
		var myDataSource = new YAHOO.util.DataSource( this.monthlyExpenses );
		myDataSource.responseType = YAHOO.util.DataSource.TYPE_JSARRAY;
		myDataSource.responseSchema =
		{
			fields: [ "month", "car", "power", "entertainment", "cable" ]
		};
		return myDataSource;	
	}	
</textarea>

<p>Our class contains a reference to a dataTip function, data, chart, styles and some custom text to be used in our data tips.</p>

<h2>Add Tips Formatting Methods</h2>

<p>We will now add all the methods necessary for formatting axis labels and data tips. It is important to note that the dataTip and axis label methods make use of other class level methods, so the ability to add socpe to these methods will prove useful.</p>

<textarea name="code" class="JScript" cols="60" rows="10">
	CustomGraph.prototype.formatCurrencyAxisLabel = function( value )
	{
		return this.numberToCurrency(value);
	}

	CustomGraph.prototype.numberToCurrency = function(value)
	{
		return YAHOO.util.Number.format( value,
		{
			prefix: "$",
			thousandsSeparator: ",",
			decimalPlaces: 2
		});	
	}		

	CustomGraph.prototype.fixedExpensesDataTipFunction = function(item, index, series)
	{
		var toolTipText = this.text;
		toolTipText += "\n" + series.displayName + " payment for " + item.month;
		toolTipText += "\n" + this.formatCurrencyAxisLabel( item[series.yField] );
		toolTipText += "\n" + this.text;
		return toolTipText;	
	}

	CustomGraph.prototype.dataTipFunction = function( item, index, series )
	{
		var expense = series.yField;
		var num = item[expense];
		return this.getDataTipText(expense, item.month, num);
	}
	
	CustomGraph.prototype.getDataTipText = function(expense, month, amount)
	{
		var toolTipText = this.text;
		toolTipText += "\nYour " + month + " " + expense;
		var limit;
		switch(expense)
		{
			case "entertainment" :
				toolTipText += " expenses are";
				toolTipText += amount <= 300 ? "\n in an acceptable range: \n" : "\n  too high. \nGo out less:\n";
			break;
			case "cable" :
				toolTipText += " bill is";
				toolTipText += amount <= 110 ? "\n in an acceptable range: \n" : "\n  too high. \nOrder less movies:\n";
			break;
			case "power" :
				toolTipText += " bill is";
				toolTipText += amount <= 80 ? "\n in an acceptable range: \n" : "\n too high. \nTurn down your AC:\n";
			break;
			
		}
		toolTipText += this.formatCurrencyAxisLabel(amount);
		toolTipText += "\n" + this.text;
		
		return toolTipText;
	}
</textarea>

<h2>Set Axis and DataTip Functions</h2>

<p>Next, we will add methods that return an axis and a series definition. We will also add a method that draws our chart. Each of these methods will create references to text formatting functions to pass to our YUI Chart instance. Our vertical axis method sets the axis label function, our series definition sets a data tip function for our car payment series and our chart method sets the data tip function for all other series.</p>

<textarea name="code" class="JScript" cols="60" rows="10">
	CustomGraph.prototype.getVerticalAxis = function()
	{
		var currencyAxis = new YAHOO.widget.NumericAxis();
		currencyAxis.alwaysShowZero = false;
		currencyAxis.labelFunction = {func:this.formatCurrencyAxisLabel, scope:this};	

		return currencyAxis;
	}	
	
	CustomGraph.prototype.getSeriesDefs = function()
	{
		var seriesDef =
		[
			{ 
				displayName: "Car", 
				yField: "car", 
				style:{skin:"DiamondSkin", color:0x006600},
				dataTipFunction:{func:this.fixedExpensesDataTipFunction, scope:this}
			 },
			{ 	
				displayName: "power", 
				yField: "power", 
				style:{color:0x8899dd}
			},
			{
				displayName: "Cable",
				yField: "cable",
				style:{color:0xee6600}
			},
			{
				displayName: "Entertainment",
				yField: "entertainment",
				style:{color:0x6e5000}
			}
		];	

		return seriesDef;
	}
	
	CustomGraph.prototype.drawChart = function(myDiv)
	{
		var myAtts = {xField:"month", version:9.28};
		myAtts.dataTipFunction = {func:this.dataTipFunction, scope:this};
		myAtts.series = this.getSeriesDefs();
		myAtts.yAxis = this.getVerticalAxis();
		myAtts.style = this.styleDefinition;
		this.chart = new YAHOO.widget.LineChart(myDiv, this.getDataSource(), myAtts);
	}	
</textarea>

<p>Normally, when setting a formatting function for the chart, a function is passed either directly or as a string reference. When you want to include scope, however, you instead pass an object with two properties, <code>func</code>, a reference to the function, and <code>scope</code>, a reference to the scope. <code>dataTipFunction:{func:myDataTipFunction, scope:this}</code>
<h2>Create the Chart</h2>

<p>Finally, we'll instantiate our class and draw the chart.</p>

<textarea name="code" class="JScript" cols="60" rows="6">
	var myGraph = new CustomGraph();
	myGraph.drawChart("chart");
</textarea>

<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?yahoo&dom&event&json&element&datasource&swf&charts&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

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					<div id="examples">
						<h3>Charts Control Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../charts/charts-quickstart.html'>Charts Quickstart Example</a></li><li><a href='../charts/charts-legend.html'>Chart with Legend Example</a></li><li><a href='../charts/charts-skins.html'>Skinning a Chart Example</a></li><li><a href='../charts/charts-datatable.html'>Chart and DataTable Example</a></li><li><a href='../charts/charts-xhr-polling.html'>Chart with DataSource Polling</a></li><li><a href='../charts/charts-stacked.html'>Stacked Bar Chart</a></li><li><a href='../charts/charts-tabview.html'>Charts in a TabView</a></li><li><a href='../charts/charts-rotation.html'>Column Chart with Rotated Title and Labels</a></li><li><a href='../charts/charts-styles.html'>Styling Lines, Borders and Fills</a></li><li><a href='../charts/charts-dualaxes.html'>Chart with 2 Numeric Axes</a></li><li><a href='../charts/charts-hideseries.html'>Hide series in a chart.</a></li><li><a href='../charts/charts-seriescustomization.html'>Customize series items</a></li><li class='selected'><a href='../charts/charts-functionscope.html'>Apply scope to label functions</a></li>							</ul>
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					<div id="module">
						<h3>More Charts Control Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/charts/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_charts.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/charts.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="selected "><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="item"><a title="The YUI Drag &amp; Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag &amp; Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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