LiveDocs Comments - coldfusion - 6.1 - htmldocs - funct130.htm

coldfusion/6.1/htmldocs/funct130.htm

guessed — 2005-09-23T01:31:50

@ no screen name [sep 21]:
For your information; I get the following output when I click 'reject':

works when manual reject is pressed
DOES NOT work with manual reject is pressed

coldfusion/6.1/htmldocs/funct130.htm

2005-09-21T11:47:29

I just ran into a problem using isDefined(). i just upgraded to 6.1 last week for another bug that was causing me problems. Now this is coming up. But not everythere.

works when manual reject is pressed

DOES NOT work with manual reject is pressed

works when manual accept is pressed

I have isDefined() all through out my application without for form scope. Is this a new bug for Cold Fusion?

coldfusion/6.1/htmldocs/funct130.htm

dorange — 2005-08-23T14:25:17

Here is a scoping problem that was driving me crazy until i figured out what's going on. I've defined a function that had url as one of it's arguments names

within the function i was testing for existiance of a url parameter as usual

However, this always returns FALSE since CF6.1 is looking at the function arguments scope first and since arguments.url is a string it returns always false no matter what the url query string is. Whether this is a feature or a bug is debatable but is sure confusing. So watch out.

coldfusion/6.1/htmldocs/funct130.htm

mocax — 2005-02-21T18:31:44

to unset a variable, use structdelete on the "variables" structure.

eg.

thisone = "ok";
writeoutput("

#isdefined('thisone')#

");
structdelete(variables,"thisone");
writeoutput("

#isdefined('thisone')#

");

coldfusion/6.1/htmldocs/funct130.htm

cannedRadio — 2005-01-18T11:07:16

IsDefined("myArray[3]") does not return "false" it produces an error. Tested in CF 5, mx, mx 6.1. You can not check for the existence of an array element, by copying the element to a simple variable and use IsDefined to test whether the simple variable exists, because you get a error trying to use the array to set the simple variable.
here is a helpful udf with example you may use until CF can handle this requirement.

function isArrayElementDefined(arrayName){
try{
testArrayVal = evaluate(arrayName);
return true;
}catch(any testForArrayElement){
return false;
}
}

#isArrayElementDefined("myArray[#place#]")#

output: true false true

coldfusion/6.1/htmldocs/funct130.htm

infamouskirch — 2004-11-22T16:00:05

the following code:

< cfif isDefined("Session.MM_Username")>
< a href "logout.cfm">Click here to log out
#Session.MM_Username#

will return the logout link and a blank as the Session.MM_Username regardless to whether or not the Session.MM_Username is defined...

Otherwise

< cfif isDefined(Session.MM_Username)>
< a href "logout.cfm">Click here to log out
#Session.MM_Username#

returns the error "Session.MM_Username is NOT defined" which is what I'm testing for, right ?

Conditional statements shouldn't be this confusing

coldfusion/6.1/htmldocs/funct130.htm

ChronoCrypt — 2004-09-09T12:15:12

Following code throws an error after it outputs the variable...?

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

#tempStructure.tempArray[1]#

tempStructure.tempArray[1] exists

coldfusion/6.1/htmldocs/funct130.htm

jrunrandy — 2004-08-25T09:44:40

The only thing I can think of is to put the variable in a structure and use the StructDelete function to delete it.

coldfusion/6.1/htmldocs/funct130.htm

Glowball — 2004-08-24T09:04:18

Is there no way to "undefine" or unset a simple variable once it has been defined?

coldfusion/6.1/htmldocs/funct130.htm

mydognacho — 2004-08-03T11:26:11

I'm playing with IsDefined and not getting the results that the CF5 language ref says I would get. IE:

IsDefined quotes: #IsDefined(andy)#

The book says that without quotes around a var, IsDefined checks to see if the contents of a variable exist rather than the variable itself. You can see that the var has contents, but when I run the code above, I get "NO", insted of YES. Any thoughts?

coldfusion/6.1/htmldocs/funct130.htm

yflicker — 2004-06-12T15:58:52

I'm trying to test whether an application-scoped variable is defined by using the following code:

(1) ...

However, when I run this code, I get the following error: "The requested scope application has not been enabled", i.e. no, the variable is not defined. It's not clear to me why the function would throw an error versus returning false (which I would think would be the logical thing to do) if the application scope has not been enabled. Anyway, what is the proper way for testing the above condition?

(2) ...?
Is this the correct way? If anything, I would think it would be more logical if this code in (2) threw an error (as opposed to the code in (1)).

(3) ...?
Is this the correct way? (1) makes the most sense to me...

Thanks

coldfusion/6.1/htmldocs/funct130.htm

halL — 2004-02-09T06:17:46

You can use either of the following ways to determine whether a dynamically named key exists:
Use the & string concatenation operator to add the key name in IsDefined, as in IsDefined("myStruct."&keyVar).
Use the StructKeyExists function with the variable name as the key parameter.
The following code shows both:

#structkeyExists(mystruct, var1)#

#structkeyExists(mystruct, var2)#

#Isdefined("Mystruct."&var1)#

#Isdefined("Mystruct."&var2)#

coldfusion/6.1/htmldocs/funct130.htm

Corey Gilmore — 2004-02-06T15:22:57

It doesn't appear my last comment posted.

IsDefined does not work, nor does it appear there is any other way to check for the value of a member of a struct, if you're referencing it using a variable member name.

For example, if you are looping like this:

IsDefined( "stOrig.#val#" ) does not work
IsDefined( "stOrig.val" ) does not work
IsDefined( "stOrig.[val]" ) does not work
StructFindKey cannot be used
StructKeyExists only checks for the existence of the key, not the value.

The problem occurs when you try and perform any type of comparison between two values inside of the loop:

coldfusion/6.1/htmldocs/funct130.htm

Corey Gilmore — 2003-11-18T12:40:56

The behavior mentioned above is documented at
http://livedocs.macromedia.com/coldfusion/6.1/htmldocs/expres33.htm

coldfusion/6.1/htmldocs/funct130.htm

Corey Gilmore — 2003-11-18T08:11:37

IsDefined will always return true for CGI.* irrespective of the actual existence of the variable.

You shouldn't see this - but you will...