< if >
Description
The < if > element defines if-then-else conditional logic.
Syntax
<if cond="ECMAScript_Expression"> child elements </if>
Attributes
| cond | The cond attribute is a Boolean expression for the conditional logic statement. This attribute is required. |
Parents
<block>, <catch>, <error>, <filled>, <help>, <if>, <noinput>, <nomatch>
Children
<assign>, <audio>, <clear>, <disconnect>, <else>, <elseif>, <enumerate>, <exit>, <goto>, <if>, <prompt>, <reprompt>, <return>, <script>, <submit>, <throw>, <value>, <var>
Extensions
None.
Limitations/Restrictions
None.
Example Code
<?xml version="1.0"?>
<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
<var name="card_type" expr="'amex'" />
<form>
<field name="card_num" type="digits">
<prompt>What is your card number?</prompt>
<filled>
<if cond="card_type == 'amex' && card_num.length != 15">
American Express card numbers must have 15 digits.
<clear namelist="card_num"/>
<elseif cond="card_type != 'amex' && card_num.length != 16"/>
Mastercard and Visa card numbers have 16 digits.
<clear namelist="card_num"/>
</if>
</filled>
</field>
</form>
</vxml>