MACROMEDIA COLFUSION MX 7-CFML, Справочник

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726 Chapter 3: ColdFusion Functions
ListLast
Description
Gets the last element of a list.
Returns
The last element of the list.
Category
List functions
Function syntax
ListLast ( list [, delimiters ])
See also
ListGetAt
,
ListFirst
; “Lists” in Chapter 3, “Using ColdFusion Variables,” in ColdFusion MX
Developer’s Guide
Parameters
Usage
If you use list functions on strings that separated by a delimiter character and a space, a returned
list element might contain a leading space; use the
trim
function to remove leading and trailing
spaces from a returned element. For example, consider this list:
<cfset myList = "one hundred, two hundred, three hundred">
To get a value from this list, use the
trim
function to remove the space before the returned value:
<cfset MyValue = #trim(ListLast(myList)#>
With this usage, the MyValue variable gets the value "three hundred", not " three hundred", and
spaces within a list element are preserved.
ColdFusion ignores empty list elements; thus, the list "a,b,c,,,d" has four elements.
Example
<h3>ListFirst, ListLast, and ListRest Example</h3>
<!--- Find a list of users who wrote messages --->
<cfquery name = "GetMessageUser" datasource = "cfdocexamples">
SELECT Username, Subject, Posted
FROM Messages
</cfquery>
<cfset temp = ValueList(GetMessageUser.Username)>
Parameter Description
list A list or a variable that contains a list.
delimiters A string or a variable that contains one. Character(s) that separate list elements.
The default value is comma.
If this parameter contains more than one character, ColdFusion processes each
occurrence of each character as a delimiter; you cannot specify a multicharacter
delimiter.