This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
3.1 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>