ListLen
Determines the number of elements in a list.
Integer; the number of elements in a list.
ListLen(list[,delimiters])
ListAppend, ListDeleteAt, ListInsertAt, ListPrepend; "Lists" in the ColdFusion Developer's Guide
|
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. The default value is comma. If this parameter contains more than one character, ColdFusion processes each occurrence of each character as a delimiter. |
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 |
|
<h3>ListLen Example</h3>
<!--- Find a list of users who wrote messages --->
<cfquery name = "GetMessageUser" datasource = "cfdocexamples">
SELECT Username, Subject, Posted
FROMMessages
</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>