ListLen |
Description
Determines the number of elements in a list.
Integer; the number of elements in a list.
Category
List functions
Function 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.**bug 24114 tlane
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>

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.