Checking if an array index IsDefined

[jl8789]

I pulled this note right out of the help file of coldfusion:

Note: The IsDefined function does not test the existence of array elements. To test whether data exists at an array index, copy the array element to a simple variable and use the IsDefined function to test the existence of the copy.

Well, what am I doing wrong then? Here is my code:
<cfset exceptArray = exceptions[#thisday#][1]>
<cfif IsDefined(&quot;exceptArray&quot>
<cfif #exceptArray# eq #CurrentDay#>
#CurrentDay#
</cfif>
</cfif>

There are only 2 sets of data in this array, [1][1], [2][1].
So when it looks for the third set it should skip the code and continue processing, except I receive this error message:
The element at position 1, of dimension 2, of an array object used as part of an expression, cannot be found.

How do I test if [3][1] exists, and if not, just continue?

 

[webmigit]

CFMX sucks..

ParameterExists is deprecated? That stinks, I don't use it but the site I now work on uses it extensively..

Anyway as for your problem, you might just create a list..

<Cfset arrlist=&quot;&quot;>

And when you create a new array element, append it to the list, that way you know what elements exists.. and then you say..

<cfif listfind(arrList,thisDay)>
...code...
</cfif>

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http://www.alfii.com

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[stevebooth]

I ran into this problem myself today. The only solution that I've found is the following:

<cfset x = ArrayNew(1)>
<cfset x[1] = &quot;A&quot;>
<cfset x[3] = &quot;C&quot;>
<cfset x[4] = &quot;D&quot;>
<cfset pos = 2>
<cftry>
<cfset Element_Exists = &quot;Yes&quot;>
<cfset Var_Value = x[Pos]>
<cfcatch type=&quot;Any&quot;>
<cfset Element_Exists = &quot;No&quot;>
</cfcatch>
</cftry>

Hope this helps...

 

[webmigit]

Also.. you could use regular variables...

<cfset exceptArray = exceptions[#thisday#][1]>

would be

<cfset exceptArray = exceptions_#thisday#_1>

rather cheap but then you could use variable validation functions.

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[webmigit]

er: <cfset exceptArray = evaluate(exceptions_#thisday#_1)>

Sorry... duh..

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[webmigit]

I think I'll just quit programming now..

<cfset exceptArray = evaluate(&quot;exceptions_#thisday#_1&quot>

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http://www.alfii.com

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[strantheman]

Ok I think I see what you need, not as complex as it seems.

Your code:
<cfset exceptArray = exceptions[#thisday#][1]>
<cfif IsDefined(&quot;exceptArray&quot>
<cfif #exceptArray# eq #CurrentDay#>
#CurrentDay#
</cfif>
</cfif>

Assuming exceptions[][] exists -- My code:
<CFLOOP from=&quot;1&quot; to=&quot;#arrayLen(exceptions)#&quot; index=&quot;i&quot;>
<CFIF exceptions[1] is currentDay>
#currentDay#<br>
</CFIF>
</CFLOOP>

hope this helps a bit