Bug 214254 Expose Javascript "event" object for interactivity
When doing interactivity with a chart, and specifying a Mouse Click event with an Invoke Script action, the browser event object should be passed into the script. This object should be named "evt", and accompany the other standard category and value series parameters.
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/util/ScriptUtil.java
{
	/**
	 * Add the value of categoryData, valueData, and valueSeriesName into
	 * script.
	 * 
	 * @param str
	 * @param dph
	 * @return the output script
	 */
	public static String script( String str, DataPointHints dph )
	{
		if ( dph != null )
		{
			str += addDataValueToScript( dph.getBaseValue( ) );
			str += ","; 
			str += addDataValueToScript( dph.getOrthogonalValue( ) );
			str += ","; 
			str += addDataValueToScript( dph.getSeriesValue( ) );
		}
		return str;
	}
	/**
	 * Return the correct string according the the data type.
	 * 
	 * @param oValue
	 * @return the formatted string
	 */
	private static String addDataValueToScript( Object oValue )
	{
		if ( oValue instanceof String )