This element is a form item. It contains executable content that is executed if the block's form item variable is undefined and the block's cond attribute, if any, evaluates to true.
|name||The name of the form item variable used to track whether this block is eligible to be executed; defaults to an inaccessible internal variable.|
|cond||An expression that must evaluate to true after conversion to Boolean in order for the form item to be visited.|
|expr||The initial value of the form item variable; default is ECMAScript undefined. If initialized to a value, then the block will not be visited unless the form item variable is cleared.|
<?xml version="1.0"?> <vxml version="2.0"> <form> <!-- This block will be executed first. --> <block> Setting block condition variables. <assign name="blockcond1" expr="true"/> <assign name="blockcond2" expr="false"/> </block> <!-- This block will be executed because "blockcond1" is "true". --> <block name="myblock1" cond="blockcond1"> <prompt> This prompt will play. </prompt> </block> <!-- This block will not be executed since "blockcond2" is "false". --> <block name="myblock2" cond="blockcond2"> <prompt> This prompt will not play. </prompt> </block> </form> </vxml>
The output of the above script would be:
Computer: Setting block condition variables.
Computer: This prompt will play.
<audio>, <assign>, <clear>, <data>, <disconnect>, <enumerate>, <exit>, <foreach>, <goto>, <if>, <log>, <prompt>, <reprompt>, <return>, <script>, <submit>, <throw>, <value>, <var>