Form Name with a Variable

The approach for the form tag is slightly different from that of cfform. Put the following code in a page, open it and view the page source in the browser.

<form>

<cfloop from = "1" to = "5" index="idx">

    <cfoutput><input name="myTxtBox_#idx#" type="text"></cfoutput><br>

</cfloop>

</form>

<cfform>
<cfloop from = "1" to = "5" index="idx">

<!--- cfoutput unnecessary --->
    <cfinput name="myFormField_#idx#" type="text"><br>
</cfloop>
</cfform>

Ian's answer pertained to processing the form.  To create it, assuming you were looping through a query, change the cfloop tag to a cfoutput tag.

You are probably looking for array syntax.

<cfoutput>#form["field_" & id]#</cfoutput>