<error>

Description

Catches error events thrown by the VoiceXML application or the VoiceGenie platform. The <error> element associates an error handler with a document, dialog (i.e. form or menu), or form item. It contains executable content. It is a shorthand notation for <catch event="error"> and catches all error events with a name whose prefix is "error". For example, error.badfetch and error.grammar.asr can be handled by this element.

Syntax



<error
    count="integer"
    cond="ECMAScript_Expression">
  child elements
</error>

Attributes

Attribute	Description
count	The count attribute allows you to handle different occurrences of the same error event differently. Each form, menu, and form item maintains a counter for each error event that occurs while it is being visited; these counters are reset each time the menu or form item's form is re-entered. When there are more than one `<error>` element catching the same error event, the element in the closest scope with the highest count that is less than or equal to the current counter will be selected. Optional. (Defaults to 1.)
cond	An ECMAScript expression to be evaluated and used as a boolean condition. This `<error>` element will only catch the error if the expression evaluates to `true`. Optional. (Defaults to true.)

Anonymous Variables

Two anonymous variables are available within the scope of the <error> element:

_event - This contains the name of the error event that was thrown.
_message - This contains the message string from the corresponding <throw>, <choice>, <link>, or <return> element, or a platform defined value for error events thrown by the platform. If no message is specified, the value of this variable is ECMAScript undefined.

Parents

Field Form Initial Menu Object Record Subdialog Transfer Vxml

Children

Assign Audio Clear Data Disconnect Enumerate Exit ForEach Goto If Log Prompt Reprompt Return Script Submit Throw Value Var #PCDATA

VoiceGenie Extensions

None

Limitations/Restrictions

None

Example



<?xml version="1.0"?>
<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
  <error>
     An error has occurred.
     <exit/>
  </error>
  <form>
    <property name="TTSENGINE" value="NONEXISTENT"/>
    <block>
      Trying to use an invalid TTS engine will cause an error.
    </block>
  </form>
</vxml>