Application-defined events

An application may throw a custom event under any name it chooses. The event will semantically behave like any other event. These events can be thrown using one of three methodologies:

• Standard VoiceXML element constructs—The <choice>, <link>, <throw>, and <return> elements provide the ability to generate custom events. These elements also provide a mechanism for passing an information message along with the event that will be available in the <catch> handler as _message.
• JavaScript—Events thrown from JavaScript may be caught by the event name they were given in JavaScript, for example:

<form>

    <catch event="my.javascript.event">

        <prompt>Caught the event!</prompt>

        <exit/>

    </catch>

    <block>

        <script> throw "my.javascript.event"; </script>

    </block>

</form>