ISML Function - isDefined()



Short Description

checks if an ISML expression results in a valid existing value

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1 Introduction

This function checks if an ISML expression results in a valid existing value. Usually, this function checks a variable for its existence (either server or user defined). It can also be used with HTTP header functions to check for the existence of special keys.

2 Syntax

isDefined( <ISML expression> )

3 Example

This example shows how isDefined()can check whether a buyer has a basket or not.

<ISIF condition="#isDefined(Basket)#">
  <ISCOMMENT> View Basket Content </ISCOMMENT>
  <!-- Basket does not exist --!>

Reference - ISML Functions


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