ListSetAt |
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Description
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Replaces the contents of a list element.
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Returns
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A copy of a list, with a new value assigned to the element at a specified position.
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Category
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List functions
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Function syntax |
ListSetAt(list, position, value [, delimiters ])
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See also
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ListDeleteAt, ListGetAt, ListInsertAt
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History
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ColdFusion MX: Changed delimiter modification: ColdFusion MX does not modify delimiters in the list. (In earlier releases, in some cases, replaced delimiters with the first character in the delimiters parameter.)
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Parameters
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Parameter |
Description |
list |
A list or a variable that contains one. |
position |
A positive integer or a variable that contains one. Position at which to set a value.The first list position is 1. |
value |
An element or a list of elements. |
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. |
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Usage
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When assigning an element to a list, ColdFusion inserts a delimiter. If delimiters contains more than one delimiter, ColdFusion uses the first delimiter in the string, or, if delimiters was omitted, a comma.
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ColdFusion ignores empty list elements; thus, the list "a,b,c,,,d" has four elements.
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Example<h3>ListSetAt 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.Subject)>
<!--- loop through the list and show it with ListGetAt --->
<h3>This is a list of <cfoutput>#ListLen(temp)#</cfoutput>
subjects posted in messages.</h3>
<cfset ChangedElement = ListGetAt(temp, 2)>
<cfset TempToo = ListSetAt(temp, 2, "I changed this subject", ",")>
<ul>
<cfloop From = "1" To = "#ListLen(temptoo)#" INDEX = "Counter">
<cfoutput><li>(#Counter#) SUBJECT: #ListGetAt(temptoo, Counter)#
</cfoutput>
</cfloop>
</ul>
<p>Note that element 2, "<cfoutput>#changedElement#</cfoutput>",
has been altered to "I changed this subject" using ListSetAt.
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