eventHandlerJson
This parameter determines that JavaScript method that is to handle events. You can use this parameter to extend the standard eventHandler parameter to allow a server-side process to return a JSON object. This JSON object contains a map of parameters that can be parsed. You can specify extra actions to be taken depending on your requirements.
Set this parameter to the function name of the JavaScript method that is to handle the events.
Sample syntax
<param name="eventHandlerJson" value="myEventHandler" />
Default setting: N/A