Application
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Contains variables that are associated with
one, named application on a server. The cfapplication tag name attribute
or the Application.cfc This.name variable setting specifies the
application name. For more information, see Using Persistent Data and Locking.
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Arguments
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Variables passed in a call to a user-defined
function or ColdFusion component method. For more information, see About the Arguments scope.
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Attributes
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Used only in custom tag pages and threads.
Contains the values passed by the calling page or cfthread tag
in the tag’s attributes. For more information, see Creating and Using Custom CFML Tags and Using ColdFusion Threads.
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Caller
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Used only in custom tag pages. The custom
tag’s Caller scope is a reference to the calling page’s Variables
scope. Any variables that you create or change in the custom tag
page using the Caller scope are visible in the calling page’s Variables
scope. For more information, see Creating and Using Custom CFML Tags.
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CGI
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Contains environment variables identifying
the context in which a page was requested. The variables available depend
on the browser and server software. For a list of the commonly used
CGI variables, see Reserved
Words and Variables in the CFML Reference.
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Client
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Contains variables that are associated with
one client. Client variables let you maintain state as a user moves
from page to page in an application, and are available across browser
sessions. By default, Client variables are stored in the system
registry, but you can store them in a cookie or a database. Client
variables cannot be complex data types and can include periods in
their names. For more information, see Using Persistent Data and Locking.
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Cookie
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Contains variables maintained in a user’s
browser as cookies. Cookies are typically stored in a file on the
browser, so they are available across browser sessions and applications.
You can create memory-only Cookie variables, which are not available
after the user closes the browser. Cookie scope variable names can
include periods.
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Flash
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Variables sent by a SWF movie to ColdFusion
and returned by ColdFusion to the movie. For more information, see Using the Flash Remoting Service.
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Form
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Contains variables passed from a Form page
to its action page as the result of submitting the form. (If you
use the HTML form tag, you must use method="post".)
For more information, see Introduction to Retrieving and Formatting Data.
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Local
(function local)
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Contains variables that are declared inside
a user-defined function or ColdFusion component method and exist only
while a function executes. For more information, see Writing and Calling User-Defined Functions.
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Request
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Used to hold data that must be available
for the duration of one HTTP request. The Request scope is available
to all pages, including custom tags and nested custom tags, that
are processed in response to the request.
This scope is useful
for nested (child/parent) tags. This scope can often be used in
place of the Application scope, to avoid the need for locking variables.
Several chapters discuss using the Request scope.
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Server
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Contains variables that are associated with
the current ColdFusion server. This scope lets you define variables
that are available to all your ColdFusion pages, across multiple
applications. For more information, see Using Persistent Data and Locking.
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Session
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Contains variables that are associated with
one client and persist only as long as the client maintains a session. They
are stored in the server’s memory and can be set to time out after
a period of inactivity. For more information, see Using Persistent Data and Locking.
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This
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Exists only in ColdFusion components or cffunction tags
that are part of a containing object such as a ColdFusion Struct.
Exists for the duration of the component instance or containing
object. Data in the This scope is accessible from outside the component
or container by using the instance or object name as a prefix.
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ThisTag
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Used only in custom tag pages. The ThisTag
scope is active for the current invocation of the tag. If a custom
tag contains a nested tag, any ThisTag scope values you set before
calling the nested tag are preserved when the nested tag returns
to the calling tag.
The ThisTag scope includes three built-in
variables that identify the tag’s execution mode, contain the tag’s
generated contents, and indicate whether the tag has an end tag.
A
nested custom tag can use the cfassociate tag to
return values to the calling tag’s ThisTag scope. For more information,
see Accessing tag instance data.
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Thread
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Variables that are created and changed inside
a ColdFusion thread, but can be read by all code on the page that creates
the thread. Each thread has a Thread scope that is a subscope of
a cfthread scope. For more information, see Using ColdFusion Threads.
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thread
local
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Variables that are available only within
a ColdFusion thread. For more information, see Using ColdFusion Threads.
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URL
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Contains parameters passed to the current
page in the URL that is used to call it. The parameters are appended
to the URL in the format ?variablename = value[&variablename=value...];
for example www.MyCompany.com/inputpage.cfm?productCode=A12CD1510&quantity=3.
If
a URL includes multiple parameters with the same name, the resulting
variable in the ColdFusion URL scope consists of all parameter values
separated by commas. For example, a URL of the form http://localhost/urlparamtest.cfm?
param=1¶m=2¶m=3 results in a URL.param variable
value of 1,2,3 on the ColdFusion page.
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Variables
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The default scope for variables of any type
that are created with the cfset and cfparam tags.
A Variables scope variable is available only on the page on which
it is created and any included pages (see also the Caller scope).
Variables
scope variables created in a CFC are available only to the component
and its functions, and not to the page that instantiates the component
or calls its functions.
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