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POHow to make tooltips show up when mouse hovers over data point
 

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  1. POHow to make tooltips show up when mouse hovers over data point
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    <p>I've been searching for some sort of tutorial focusing on how tooltips to work, but have not had much luck. </p> <p>I have a test project where I render a line chart with five data points. When I instantiate the <code>Chart</code> object I set <code>IsMapEnabled = true</code>. When I define the series I try to set the tool tip.</p> <pre><code> private void DefineSeries() { var series = new Series(); series.ToolTip = "#VALY"; series.PostBackValue = "#Index"; var x = new[] {0, 1, 2, 3, 4, 5}; var y = new[] {0, 4, 5, 3, 7, 2}; for ( int i = 0; i &lt; x.Length; i++ ) { series.Points.Add( new DataPoint( x[ i ], y[ i ] ) ); } series.ChartType = SeriesChartType.Line; DefineSeriesStyle( series ); chart_.Series.Add( series ); } </code></pre> <p>The chart renders as expected, but a tooltip does not display when the mouse hovers over a data point. I am clearly missing a step somewhere, but I have no idea what it is.</p> <p><strong>EDIT:</strong> Code that shows the Action method and constructor for the chart view model and subsequent function call.</p> <pre><code> public ActionResult CausedOutPoint() { var causedOut = new CausedOutViewModel(); var path = Server.MapPath( "~" ) + "CausedOut.Png"; causedOut.Chart.SaveImage( path, ChartImageFormat.Png ); return File( path, "img/png" ); } public CausedOutViewModel() { chart_ = new Chart {IsMapEnabled = true}; chart_.PostPaint += chart__PostPaint; chart_.RenderType = RenderType.ImageMap; chart_.ID = "CausedOut"; InitializeChart( chart_ ); chart_.Width = new Unit( 1200, UnitType.Pixel ); chart_.Height = new Unit( 800, UnitType.Pixel ); CreateTitles(); } private void InitializeChart( ) { DefineSeries(); DefineChartArea(); } </code></pre>
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    1. CODid you set an ID for the `Chart`, as referenced in the accepted answer for [MSChart / Asp.net Charts dont show tooltips](http://stackoverflow.com/questions/9456506/mschart-asp-net-charts-dont-show-tooltips)?
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      1. POHow to make tooltips show up when mouse hovers over data point
      1. USKarl Anderson
    2. COI did see that during my searches. I tried it and still nothing.
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