ListLen |
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Description
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Determines the number of elements in a list.
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Integer; the number of elements in a list.
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Category
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List functions
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Function syntax |
ListLen(list [, delimiters ])
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See also
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ListAppend, ListDeleteAt, ListInsertAt, ListPrepend
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Parameters
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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. |
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Default: comma. |
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If this parameter contains more than one character, ColdFusion processes each |
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occurrence of each character as a delimiter.**bug 24114 tlane |
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Usage
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ColdFusion ignores empty list elements; thus, the list "a,b,c,,,d" has four elements.
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Here are some examples of ListLen processing:
Statement |
Output |
Comment |
ListLen('a,b, c,,,d')
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4
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Third element is " c"
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ListLen('a,b, c,,,d',',') |
4
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Fourth element is "d'"
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ListLen('elem_1___elem_2___elem_3') |
1 |
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ListLen('elem*1***elem*2***elem*3') |
1
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ListLen('elem_1___elem_2___elem_3','_') |
6
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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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