ListGetAt
Gets a list element at a specified position.
Value of the list element at position position.
ListGetAt(list,position[,delimiters])
ListFirst, ListLast, ListQualify, ListSetAt; "Lists" in the ColdFusion Developer's Guide
|
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 get element. The first list position is 1. |
| 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. |
If you use list functions on strings that are delimited by a delimiter character and a space, a returned list element might contain a leading space; you use the trim function to remove such spaces from a returned element. For example, consider this list:
<cfset myList = "one hundred, two hundred, three hundred">
To get a value from this list, use the trim function to remove the space before the returned value:
<cfset MyValue = #trim(listGetAt(myList, 2))#>
With this usage, MyValue = "two hundred", not " two hundred", and spaces within a list element are preserved.
ColdFusion ignores empty list elements; thus, the list "a,b,c,,,d" has four elements.
<h3>ListGetAt 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 list of usernames who have posted messages numbers
<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>