Chapter 15: VoiceXML Reference: Events, Properties and Variables

15.1 Events

The following events are pre-defined by the VoiceXML language.

Event	Description
cancel	User input matched the built-in cancel grammar.
error.badfetch	A resource is required but the browser was unable to fetch it from the specified URL.
error.badfetch.http.nnn	HTTP error nnn occurred, for example, 404 for Page Not Found.
error.noauthorization	"Access denied" error, user has tried to do something without sufficient permission.
error.semantic	A semantic error was found in the VoiceXML page, for example an undefined variable was referenced, divide by zero, root document tag has an application attribute, etc.
error.unsupported.format	Browser does not support the resource format, e.g. sound file type, grammar type etc.
error.unsupported.tag	The browser does not support the given tag. E.g., if the browser does not support , it would throw error.unsupported.subdialog.
exit	User input matched the built-in exit grammar.
help	User input matched the built-in help grammar.
noinput	No user input was expected but none was detected.
nomatch	User input did not match the grammar for the current form or field.
telephone.disconnect. hangup	The user hung up or a was executed.
telephone.disconnect. transfer	The browser hung up as a result of an unconditional transfer.

The following default event handlers are built into a VoiceXML browser.

Event	Default handler
cancel	Do nothing (continue to interpret the current dialog).
error	Message, .
exit
help	Message, .
noinput	.
nomatch	Message, .
telephone. disconnect	.
Other	Message, .

"Message" indicates that the browser plays a message, the message content is browser-dependent.

< Previous Excerpt Next Excerpt >

Purchase This Book