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The annotations can be controlled by JavaScript using the following methods:

Function Name Parameter Description
showAnnotation(strGroupID) strGroupID Shows an annotation with the specified group ID.
hideAnnotation(strGroupID) strGroupID Hides an annotation with the specified group ID.
Using these methods

To use any of these methods, you need to refer to the chart and then call any of these methods. To refer to a chart, you can use the DOMID of the chart and pass it using any of the following ways:

var chartRef = FusionCharts("myChartId");


var chartRef = FusionCharts.items["myChartId"]; 

The legacy function getChartFromId() still works as show below:

var chartRef =  getChartFromId("myChartId"); 

However, note that getChartFromId() has been deprecated.

You can call the JavaScript APIs of a chart only after it has rendered. You can use the FC_Rendered event tracker or the Rendered event listener to check if a chart has rendered. For more information, please see FusionWidgets XT and JavaScript section.

The code below shows how to hide and show annotations in an Angular gauge:

		<title>FusionWidgets XT - JS API</title>
		<script type="text/javascript" src="../Charts/FusionCharts.js"></script>
		<div id="chart1div">This text is replaced by the gauge</div>
		<script type="text/javascript">
			// Create a gauge with a gold dial and a gray dial (Using Annotation Groups)
			// <annotationGroup id="blueTheme" ...> 
			// <annotationGroup id="grayTheme" visible="0" ...> 
			// The gray dial group is set to in-visible <annotationGroup visible='0' ...> 
			var chart1 = new FusionCharts("../Charts/AngularGauge.swf", "ChId1", "280", "280", "0", "1");
		<input value="Apply Gray Theme" type="button" onclick="FusionCharts('ChId1').showAnnotation('grayTheme'); FusionCharts('ChId1').hideAnnotation('blueTheme');" />
		<input value="Apply Blue Theme" type="button" onclick="FusionCharts('ChId1').showAnnotation('blueTheme'); FusionCharts('ChId1').hideAnnotation('grayTheme');" />		

See it live!

The code renders a clock with a blue dial. When Apply Gray Theme button is clicked, the blue dial disappears and a dark gray dial appears as shown below:


While accessing any of the JavaScript methods listed above, if you get an error like "... is not a function of ...", make sure of the following points:

  • Make sure that you're not calling the JavaScript method before the chart has loaded and rendered. You need to use the FC_Rendered function or define event listener for Rendered event of chart, to track the loading of chart as explained in the FusionWidgets XT and JavaScript section.
  • Make sure that you're NOT running the chart from local file system (C:\ , D:\). Instead, run the chart from behind a server (localhost - IIS, Apache etc.). This is because the Flash Player security settings do not allow the chart to interact with JavaScript on local file system by default, unless otherwise specifically set.