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developer_guide:voicexml_references:elements:if [2015/10/27 12:57] (current)
borja created
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 +====== < if > ======
  
 +===== Description =====
 +
 +The < if > element defines if-then-else conditional logic.
 +
 +===== Syntax =====
 +
 +<​code>​
 +<if
 +cond="​ECMAScript_Expression">​
 +child elements
 +</if>
 +</​code>​
 +
 +===== Attributes =====
 +
 +|cond|The cond attribute is a Boolean expression for the conditional logic statement. This attribute is required.|
 +
 +
 +===== Parents =====
 +
 +<​code>​
 +<​block>,​ <​catch>,​ <​error>,​ <​filled>,​ <​help>,​ <if>, <​noinput>,​ <​nomatch>​
 +</​code>​
 +
 +===== Children =====
 +
 +<​code>​
 +<​assign>,​ <​audio>,​ <​clear>,​ <​disconnect>,​ <​else>,​ <​elseif>,​ <​enumerate>,​ <​exit>,​ <​goto>,​ <if>, <​prompt>,​ <​reprompt>,​ <​return>,​ <​script>,​ <​submit>,​ <​throw>,​ <​value>,​ <var>
 +</​code>​
 +
 +===== Extensions =====
 +
 +<​code>​
 +None.
 +</​code>​
 +
 +===== Limitations/​Restrictions =====
 +
 +<​code>​
 +None.
 +</​code>​
 +
 +===== Example Code =====
 +
 +<​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'​ &​amp;&​amp;​ card_num.length != 15">​
 +     ​American Express card numbers must have 15 digits.
 +     <​clear namelist="​card_num"/>​
 +    <elseif cond="​card_type != '​amex'​ &​amp;&​amp;​ card_num.length != 16"/>​
 +     ​Mastercard and Visa card numbers have 16 digits.
 +     <​clear namelist="​card_num"/>​
 +    </if>
 +   </​filled>​
 +  </​field>​
 + </​form>​
 +</​vxml>​
 +</​code>​