Adobe 38043740 Developing Applications - Page 162

Using the Arguments scope as an array, tags immediately following

Page 162 highlights

DEVELOPING COLDFUSION 9 APPLICATIONS 157 Building Blocks of ColdFusion Applications Attribute name returnType roles output Description The function name. (Optional) The type of data that the function returns. The valid standard type names are: any, array, binary, Boolean, date, guid, numeric, query, string, struct, uuid, variableName, xml, and void. If you specify any other name, ColdFusion requires the argument to be a ColdFusion component with that name. ColdFusion throws an error if you specify this attribute and the function tries to return data with a type that ColdFusion cannot automatically convert to the one you specified. For example, if the function returns the result of a numeric calculation, a returnType attribute of string or numeric is valid, but array is not. (Optional) A comma-delimited list of security roles that can run this method. If you omit this attribute, ColdFusion does not restrict user access to the function. If you use this attribute, the function executes only if the current user is logged in using the cfloginuser tag and is a member of one or more of the roles specified in the attribute. Otherwise, ColdFusion throws an unauthorized access exception. For more information on user security, see "Securing Applications" on page 339. (Optional) Determines how ColdFusion processes displayable output in the function body. If you do not specify this option, ColdFusion treats the body of the function as normal CFML. As a result, text and the result of any cfoutput tags in the function definition body are displayed each time the function executes. If you specify true or yes, the body of the function is processed as if it is in a cfoutput tag. ColdFusion displays variable values and expression results if you surround the variables and expressions with number signs (#). If you specify false or no., the function is processed as if it is in a cfsilent tag. The function does not display any output. The code that calls the function is responsible for displaying any function results. Use cfargument tags for required function arguments. All cfargument tags must precede any other CFML code in a cffunction tag body. Therefore, place the cfargument tags immediately following the cffunction opening tag. The cfargument tag takes the following attributes: Attribute name type required default Description The argument name. (Optional) The data type of the argument. The type of data that is passed to the function. The valid standard type names are any, array, binary, Boolean, date, guid, numeric, query, string, struct, uuid, and variableName. If you specify any other name, ColdFusion requires the argument to be a ColdFusion component with that name. ColdFusion throws an error if you specify this attribute and the function is called with data of a type that ColdFusion cannot automatically convert to the one you specified. For example, if the argument type attribute is numeric, you cannot call the function with an array. (Optional) A Boolean value that specifies whether the argument is required. If set to true and the argument is omitted from the function call, ColdFusion throws an error. The default value is false. The required attribute is not required if you specify a default attribute. Because you do not identify arguments when you call a function, all cfargument tags that specify required arguments must precede any cfargument tags that specify optional arguments in the cffunction definition. (Optional) The default value for an optional argument if no argument value is passed. If you specify this attribute, ColdFusion ignores the required attribute. Note: The cfargument tag is not required for optional arguments. This feature is useful if a function can take an indeterminate number of arguments. If you do not use the cfargument tag for an optional argument, reference it by using its position in the Arguments scope array. For more information see "Using the Arguments scope as an array" on page 162. Last updated 1/20/2012

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157
DEVELOPING
COLDFUSION 9 APPLICATIONS
Building Blocks of ColdFusion Applications
Las
t
upda
te
d 1/20/2012
Use
cfargument
tags for required function arguments. All
cfargument
tags must precede any other CFML code in a
cffunction
tag body. Therefore, place the
cfargument
tags immediately following the
cffunction
opening tag. The
cfargument
tag takes the following attributes:
Note:
The
cfargument
tag is not required for optional arguments. This feature is useful if a function can take an
indeterminate number of arguments. If you do not use the
cfargument
tag for an optional argument, reference it by
using its position in the Arguments scope array. For more information see “
Using the Arguments scope as an array
” on
page
162.
Attribute
Description
name
The function name.
returnType
(Optional) The type of data that the function returns. The valid standard type names are: any, array, binary,
Boolean, date, guid, numeric, query, string, struct, uuid, variableName, xml, and void. If you specify any other
name, ColdFusion requires the argument to be a ColdFusion component with that name.
ColdFusion throws an error if you specify this attribute and the function tries to return data with a type that
ColdFusion cannot automatically convert to the one you specified. For example, if the function returns the result
of a numeric calculation, a returnType attribute of string or numeric is valid, but array is not.
roles
(Optional) A comma-delimited list of security roles that can run this method. If you omit this attribute, ColdFusion
does not restrict user access to the function.
If you use this attribute, the function executes only if the current user is logged in using the
cfloginuser
tag
and is a member of one or more of the roles specified in the attribute. Otherwise, ColdFusion throws an
unauthorized access exception. For more information on user security, see “
Securing Applications
” on page
339.
output
(Optional) Determines how ColdFusion processes displayable output in the function body.
If you do not specify this option, ColdFusion treats the body of the function as normal CFML. As a result, text and
the result of any
cfoutput
tags in the function definition body are displayed each time the function executes.
If you specify
true
or
yes
, the body of the function is processed as if it is in a
cfoutput
tag. ColdFusion displays
variable values and expression results if you surround the variables and expressions with number signs (#).
If you specify
false
or
no
., the function is processed as if it is in a
cfsilent
tag. The function does not display
any output. The code that calls the function is responsible for displaying any function results.
Attribute
Description
name
The argument name.
type
(Optional) The data type of the argument. The type of data that is passed to the function. The valid standard type
names are any, array, binary, Boolean, date, guid, numeric, query, string, struct, uuid, and variableName. If you
specify any other name, ColdFusion requires the argument to be a ColdFusion component with that name.
ColdFusion throws an error if you specify this attribute and the function is called with data of a type that
ColdFusion cannot automatically convert to the one you specified. For example, if the argument
type
attribute
is numeric, you cannot call the function with an array.
required
(Optional) A Boolean value that specifies whether the argument is required. If set to
true
and the argument is
omitted from the function call, ColdFusion throws an error. The default value is
false
. The required attribute is
not required if you specify a
default
attribute.
Because you do not identify arguments when you call a function, all
cfargument
tags that specify required
arguments must precede any
cfargument
tags that specify optional arguments in the
cffunction
definition.
default
(Optional) The default value for an optional argument if no argument value is passed. If you specify this attribute,
ColdFusion ignores the
required
attribute.