CFCOMPONENT |
Description Creates and defines a component object; encloses functionality that you build in CFML and enclose within cffunction tags. This tag contains one or more cffunction tags that define methods. Code within the body of this tag, other than cffunction tags, is executed when the component is instantiated.

A component file has the extension CFC and is stored in any directory of an application.

A component method is invoked in the following ways:

- Within the cfinvoke tag in a ColdFusion page
- Within a URL that calls a CFC file and passes a method name as a URL parameter
- Within the cfscript tag
- As a web service
- From Flash code

Category Extensibility tags
Syntax
    <cfcomponent
       extends ="anotherComponent"
       output = "yes" or "no"
       style = "rpc" or "document"
       namespace = "default service namespace"
       serviceportname = "port element name"
       porttypename = "porttype element name"
       bindingname = "binding element name"
       wsdlfile = "path to hard-coded wsdl file"
       displayname = "text string">
       hint = "text string">
       variable declarations
       <cffunction ...>
          ...
       </cffunction>

       <cffunction ...>
          ...
       </cffunction>
    </cfcomponent>
See also cfargument, cffunction, cfinvoke, cfinvokeargument, cfobject, cfproperty, cfreturn, Chapter 10, "Building and Using ColdFusion Components" in ColdFusion MX Developer's Guide
History ColdFusion MX 7:

- Added support for publishing document-literal style web services.
- Added the style, namespace, serviceportname, porttypename, wsdlfile, and bindingname attributes.
- Extended functionality for the hint and displayname attributes when publishing document-literal style web services.

ColdFusion MX: Added this tag.

Usage If you specify the extends attribute, the data and methods of the parent component are available to CFC methods as if they were parts of the current component. If the managerCFC component extends the employeeCFC component, and the employeeCFC component has a getEmployeeName method, you can call this method using the managerCFC, as follows:
    <cfinvoke component="managerCFC" method="getEmployeeName"
    returnVariable="managerName" EmployeeID=#EmpID#>
This tag requires an end tag. If you specify style="document", ColdFusion MX publishes the CFC as a document-literal style web service. For more information, see "Publishing document-literal style web services" in Chapter 36, "Using Web Services" in ColdFusion MX Developer's Guide.
Example
    <cfcomponent>
       <cffunction name="getEmp">
           <cfquery name="empQuery" datasource="cfdocexamples" >
              SELECT FIRSTNAME, LASTNAME, EMAIL
              FROM tblEmployees
           </cfquery>
           <cfreturn empQuery>
       </cffunction>

       <cffunction name="getDept">
          <cfquery name="deptQuery" datasource="cfdocexamples" >
              SELECT *
              FROM tblDepartments
           </cfquery>
           <cfreturn deptQuery>
       </cffunction>
    </cfcomponent>

EXTENDS |
| Optional
Name of parent component from which to inherit methods and properties.

OUTPUT |
| Optional
Default value: "Component body displayable text is processed as standard CFML" Specifies whether constructor code in the component can generate HTML output; does not affect output in the body of cffunction tags in the component.

- yes: Constructor code is processed as if it were within a cfoutput tag. Variable names surrounded by number signs (#) are automatically replaced with their values.
- no: Constructor code is processed as if it were within a cfsilent tag.
- If you do not specify this attribute, constructor code is processed as standard CFML. Any variables must be in cfoutput tags.

STYLE |
| Optional
Default value: "rpc" Specifies whether a CFC used for web services uses RPC-encoded style or document-literal style:

- rpc: RPC-encoded style
- document: document-literal style

NAMESPACE |
| Optional
Default value: "classname" Specifies the namespace used in the WSDL when using the CFC as a document-literal style web service. If you don't specify this attribute, ColdFusion MX derives the value from the CFC class name. This attribute applies only when style="document".

SERVICEPORTNAME |
| Optional
Specifies the name attribute of the port element in the WSDL. If you don't specify this attribute, ColdFusion MX derives the value from the CFC class name. This attribute applies only when style="document".

PORTTYPENAME |
| Optional
Specifies the name attribute of the porttype element in the WSDL. If you don't specify this attribute, ColdFusion MX derives the value from the CFC class name. This attribute applies only when style="document".

BINDINGNAME |
| Optional
Specifies the binding attribute of the port element in the WSDL. If you don't specify this attribute, ColdFusion MX derives the value from the CFC class name. This attribute applies only when style="document".

WSDLFILE |
| Optional
A properly formatted WSDL file to be used instead of WSDL generated by ColdFusion MX. This attribute applies only when style="document".

DISPLAYNAME |
| Optional
A string to be displayed when using introspection to show information about the CFC. The information appears on the heading, following the component name. If the style attribute is set to document, ColdFusion MX uses the displayname attribute as the name attribute of the service element in the WSDL.

HINT |
| Optional
Text to be displayed when using introspection to show information about the CFC. The hint attribute value appears below the component name heading. This attribute can be useful for describing the purpose of the parameter. If the style attribute is set to document, ColdFusion MX uses the hint attribute as the content of the documentation element of the service in the WSDL.