Canvas Form Event Constants (CFEC)

CFEC is a global registry introduced in CT 18.1 to help you access the list of form specific events through constants. Use CFEC to call a form event as shown in the following code:
this.fm.registerHandler(CFEC.CLICK, '<FORM_BUTTON/HYPERLINK_ID>', function(fm, event,fieldName)
{
//Developer to perform operations here.
});

OR
You can also use the form event name without using the constant. Sample code is as follows:
this.fm.registerHandler('cbxclick', '<FORM_BUTTON/HYPERLINK_ID>', function(fm, event,fieldName)
{
//Developer to perform operations here.
});