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How to customize the trackball tooltip text dynamically Web Forms Charts?

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Essential Chart supports customizing tooltip text in trackball dynamically by using TrackToolTip event of Chart. Refer to Chart events for more information about the events available in Chart and also refer to TrackToolTip event for more information about the arguments available in the track tooltip event handler.

The event handler receives an object containing cancel, data, model and type properties. You can use the currentText property present in data property of the argument to customize the trackball tooltip text. The following code example illustrates the same.


<ej:Chart ID="container" OnClientTrackToolTip="trackTooltip" runat="server"> 
        <Crosshair Visible="true" Type="Trackball"></Crosshair>        
       <CommonSeriesOptions DashArray="5,5" type="Line">           
<script type="text/javascript">    
    //Event handler for TrackToolTip event
    function trackTooltip(sender) {        
        if ( == 0) {           
   = "Customized trackball tooltip";

The following screenshot displays the Chart with customized trackball tooltip.

Customized the trackball tooltip text dynamically

Figure 1: Chart with customized trackball tooltip


A new version of Essential Studio for ASP.NET is available. Versions prior to the release of Essential Studio 2014, Volume 2 will now be referred to as a classic versions.The new ASP.NET suite is powered by Essential Studio for JavaScript providing client-side rendering of HTML 5-JavaScript controls, offering better performance, and better support for touch interactivity. The new version includes all the features of the old version, so migration is easy.

The Classic controls can be used in existing projects; however, if you are starting a new project, we recommend using the latest version of Essential Studio for ASP.NET. Although Syncfusion will continue to support all Classic Versions, we are happy to assist you in migrating to the newest edition.

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