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.
isDefined( <ISML expression> )
This example shows how isDefined()
can check whether a buyer has a basket or not.
<ISIF condition="#isDefined(Basket)#"> <ISCOMMENT> View Basket Content </ISCOMMENT> <ISELSE> <!-- Basket does not exist --!> </ISIF>
The information provided in the Knowledge Base may not be applicable to all systems and situations. Intershop Communications will not be liable to any party for any direct or indirect damages resulting from the use of the Customer Support section of the Intershop Corporate Web site, including, without limitation, any lost profits, business interruption, loss of programs or other data on your information handling system.