This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
3.7 clear
|
Element type |
clear |
|
Attributes |
namelist |
|
Parents |
block | catch | error | filled | help | if | noinput | nomatch |
|
Children |
None. |
|
Description |
Clears variables in the current variable scope, setting them to undefined. |
DTD
<!ELEMENT clear EMPTY > <!ATTLIST clear namelist %field.names; #IMPLIED >
Language model
Attributes
-
namelist : field.names
-
The name of the form item variables to be cleared. A list of form item names delimited by whitespace.
Children
None.
Examples
Example 3-9 Clearing a field's value
<?xml version="1.0" encoding="iso-8859-1"?>
<vxml version="1.0">
<form id="GrammarTest">
<var name="Gram"/>
<field name="WhatYouSaid" type="currency">
<prompt>Say some currency</prompt>
<filled>
<assign name="Gram" expr="WhatYouSaid"/>
<prompt>
You said:
<value expr="WhatYouSaid"/>,
which was stored as:
<value expr="Gram"/>.
The shadow variable 'utterance' contains:
<value expr="WhatYouSaid$.utterance"/>.
</prompt>
<clear namelist="WhatYouSaid"/>
</filled>
</field>
</form>
</vxml>