User Guide

cfloop: looping over a list or file 239
cfloop: looping over a COM collection or structure
Description
The cfloop collection attribute loops over every object within a COM/DCOM collection
object, or every element in a structure:
• A COM/DCOM collection object is a set of similar items referenced as a group. For example,
the group of open documents in an application is a collection.
• A structure contains a related set of items, or it can be used as an associative array. Looping is
particularly useful when using a structure as an associative array.
In the loop, each item is referenced by the variable name in the
item attribute. The loop executes
until all items have been accessed.
The
collection attribute is used with the item attribute. In the example that follows, item is
assigned a variable called
file2, so that with each cycle in the cfloop, each item in the collection
is referenced. In the
cfoutput section, the name property of the file2 item is referenced for
display.
Example
This example uses a COM object to output a list of files. In this example, FFunc is a collection of
file2 objects.
<cfobject
class = FileFunctions.files
name = FFunc
action = Create>
<cfset FFunc.Path = "c:\">
<cfset FFunc.Mask = "*.*" >
<cfset FFunc.attributes = 16 >
<cfset x = FFunc.GetFileList()>
<cfloop collection = #FFUNC# item = "file2">
<cfoutput>#file2.name# <br> </cfoutput>
</cfloop>
<!---Loop through a structure that is used as an associative array: --->
...<!--- Create a structure and loop through its contents --->
<cfset Departments = StructNew()>
<cfset val = StructInsert(Departments, "John ", "Sales ")>
<cfset val = StructInsert(Departments, "Tom ", "Finance ")>
<cfset val = StructInsert(Departments, "Mike ", "Education ")>
<!--- Build a table to display the contents --->
<cfoutput>
<table cellpadding = "2 " cellspacing = "2 ">
<tr>
<td><b>Employee</b></td>
<td><b>Dept.</b></td>
</tr>
<!--- Use item to create the variable person to hold value of key as loop runs
--->
<cfloop collection = #Departments# item = "person ">
<tr>
<td>#person#</td>
<td>#StructFind(Departments, person)#</td>
</tr>
</cfloop>
</table>
</cfoutput>