Custom Tag Question

Posted on 2001-06-20
Last Modified: 2013-12-24
Here is what I am trying to do:
 <cfset myArray = ArrayNew(1)>
 <cfset myArray[1] = StrucNew()>

      r_stOutput = "myArray[1]"
where ctReturnSomething custom tag is defined as follows:
<cfset myStruct = StructNew()>
<cfset myStruct.junk = 2>
<cfset "Caller.#Attributes.r_stOutput#" = myStruct>

The problem:
The return assignment in the custom tag fails when it is desired to stuff the retun value directly into an array slot.

Question by:Scott Bennett
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Expert Comment

ID: 6213604
Why don't you just add an extra line after the custom tag?

cfset myArray = ArrayNew(1)>
<cfset myArray[1] = StrucNew()>

     r_stOutput = "stReturn"

<cfset myArray[1] = StructCopy(stReturn)>

I think that the problem with what you are doing is that the return variable is being seen as a string and not a variable. If you really want to get it to work you could try playing around with Evaluate().

LVL 14

Author Comment

by:Scott Bennett
ID: 6215392
In order to get my code to work I actaully thought of and did what you suggested (which is to have the tag return a structure and insert the stucture into the array in a seperate line of code) before I ever posted this question.
   However, Just out of curiosity to see if was possible, I posted the question. So I am not looking for alternatives, I just want to know if it is possible to do what the example code a gave in my original quesion is attempting to do. (Keeping in mind that the custom tag
performs the following code:

<cfset "Caller.#Attributes.r_stOutput#" = myStruct>

It must not be aware of whether it is stuffing "myStruct" into and array or a structure or a list or whatever.)

   If someone can give me a definite "No, that's not possible" or a "Yes, it is possible and here's how you do it..." answer they will be awarded the points.

As to using the Evaluate() function:
  I have not yet had opportunity or the neccesity to get well aquainted with the evaluate(), DE(), or IIF() Funtions. I have read the cfstudio help on them and kind of undertstand the basic concepts but have not successfully used them for any thing yet. If you could show me how to use it in this situation succesfully, I will award you the points.


Accepted Solution

CF_Spike earned 300 total points
ID: 6215743

You can't do what you want to do specifically because ColdFusion doesn't allow [] to appear in variable names and it doesn't allow you to use a complex data type as the dynamic part of a variable declaration such as:

<cfset "myvar.#someothervar#" = "junk">

If you wanted to do the same thing where the dynamic part was a structure you should be able to do that fine because you can use dot notation which is valid for variable names.

For example:

Calling page:

<CFSET myStruct = StructNew()>

     r_stOutput = "myStruct.key1"

<CFLOOP COLLECTION="#myStruct.Key1#" ITEM="i">

Custom Tag:

<cfset myStruct = StructNew()>
<cfset myStruct.junk = 2>
<cfset "Caller.#Attributes.r_stOutput#" = myStruct>

This should output the value 2.

LVL 14

Author Comment

by:Scott Bennett
ID: 6215797
Thank you very much, cf_Spike, you have satisfied my curiosity.


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