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Home > Forums > Programmers > Web Development > Adobe > FAQs

Adobe FAQ

Arrays

Check for existing array element by TruthInSatire
faq232-5617
Posted: 18 Jan 05

The built in function isDefined() can not test arrays.  Attempting a test will produce an error.

isdefined("myArray[1]")
produces

Quote (error):


Parameter 1 of function IsDefined, which is now "myArray[1]", must be a syntactically valid variable name.

In order to test for the existance of an array element this UDF should do the trick.

USE: isArrayElementDefined("myArray[element]")
(This function also works for multi-dimensional arrays)

CODE

<cfscript>
    //define the function
    function isArrayElementDefined(arrayName){
          //use try{} to attempt using the array element
          try{
            //use the array element and return true
            testVar = evaluate(arrayName);
            return true;
          //if using it causes an error catch it and return false
          }catch(any test){
            return false;
        }
    }
</cfscript>

EXAMPLE:

CODE

<cfset myArray = arrayNew(1)>
<cfset myArray[1] = "bob">
<cfset myArray[3] = "joe">
<cfoutput>
<cfloop from = "1" to = "3" index = "place">
#isArrayElementDefined("myArray[#place#]")#
</cfloop>
</cfoutput>
OUTPUT: true false true

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