3.1. assign
| Element type | assign |
| Attributes | expr | name |
| Parents | block | catch | error | filled | help | if | noinput | nomatch |
| Children | None. |
| Description | Assigns a value to a variable. The variable must have already been declared with a var element or with ECMAScript code, or else this will cause a semantic.error to be thrown. |
DTD
<!ELEMENT assign EMPTY > <!ATTLIST assign name %field.name; #REQUIRED expr %expression; #REQUIRED >
Language model
Attributes
The two attributes of assign represent a key/value pair.
name : field.name
Indicates the name of the ECMAScript variable to be altered.
expr : expression
An ECMAScript expression whose value will be assigned to the variable.
Children
None.
Examples
Example 3-1. Using assign to increment volume
<?xml version="1.0" encoding="iso-8859-1"?>
<vxml version="1.0">
<var name="volume" value="1"/>
<form id="test">
<block>
<if cond="volume > 5">
<assign name="volume" expr="volume - 1"/>
</if>
<if cond="volume < 5">
<assign name="volume" expr="volume + 1"/>
</if>
</block>
</form>
</vxml>
|
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