CFML Reference

ListLen

Description

Determines the number of elements in a list.

Integer; the number of elements in a list.

Category

List functions

Syntax

ListLen(list [, delimiters ])

See also

ListAppend, ListDeleteAt, ListInsertAt, ListPrepend

Parameters

Parameter	Description
list	A list or a variable that contains one.
delimiters	A string or a variable that contains one. Character(s) that separate list elements. Default: comma. If this parameter contains more than one character, ColdFusion processes each occurrence of each character as a delimiter.

Usage

ColdFusion ignores empty list elements; thus, the list "a,b,c,,,d" has four elements.

Here are some examples of ListLen processing:

Statement	Output	Comment
ListLen('a,b, c,,,d')	4	Third element is " c"
ListLen('a,b, c,,,d',',')	4	Fourth element is "d'"
ListLen('elem_1___elem_2___elem_3')	1
ListLen('elem*1***elem*2***elem*3')	1
ListLen('elem_1___elem_2___elem_3','_')	6

Example

<h3>ListLen Example</h3>
<!--- Find a list of users who wrote messages --->
<cfquery name = "GetMessageUser" datasource = "cfsnippets">
  SELECT Username, Subject, Posted
  FROM  Messages
</cfquery>
<cfset temp = ValueList(GetMessageUser.Username)>
<!--- loop through the list and show it with ListGetAt --->
<h3>This is a list of usernames who have posted messages
<cfoutput>#ListLen(temp)#</cfoutput> users.</h3>
<ul>
<cfloop From = "1" TO = "#ListLen(temp)#" INDEX = "Counter">
  <cfoutput><li>Username #Counter#: 
   #ListGetAt(temp, Counter)#</cfoutput>
</cfloop>
</ul>

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