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< assign >
Description
The <assign> element assigns a value to a variable. It is illegal to make an assignment to a variable that has not been explicitly declared using a <var> element or a <var> statement within a <script>. Attempting to assign an undeclared variable causes an error.semantic event to be thrown.
Syntax
<assign name="string" expr="ECMAScript_Expression"/>
Attributes
| name | The name of the variable being assigned to. This is required. |
| expr | The value to assign to the variable. This is required. |
Parents
<block>, <catch>, <error>, <filled>, <help>, <if>, <noinput>, <nomatch>
Children
None.
Extensions
None.
Limitations/Restrictions
None.
Example Code
<?xml version="1.0"?> <vxml version="2.0" xmlns="http://www.w3.org/2001/vxml"> <var name="tree" expr="'an apple tree'"/> <form> <block> <prompt> The initial value is <value expr="tree"/> </prompt> <assign name="tree" expr="'apple orchards'"/> <prompt> The new value is <value expr="tree"/> </prompt> </block> </form> </vxml>