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ColdFusion Functions


IsCustomFunction

Description

Returns TRUE if name can be called as a custom function; otherwise returns FALSE.

Category

Decision functions

Syntax 

IsCustomFunction(name)

Parameters

Parameter
Description
name
 The name of a custom function. The parameter value is the unquoted function name to check.

Example 

<CFScript> 

function myfunc(){ return ""; } 
request.myfunc = myfunc; 

if( IsCustomFunction( myfunc )) 
  WriteOutput( "myfunc is a UDF"); 
else 
  WriteOutput( "myfunc is NOT a UDF"); 

if( IsCustomFunction( request.myfunc)) 
  WriteOutput( "request.myfuncis a UDF"); 
else 
  WriteOutput( "request.myfunc is NOT a UDF"); 

if( IsCustomFunction( yourfunc )) 
  WriteOutput( "yourfunc is a UDF"); 
else 
  WriteOutput( "yourfunc is NOT a UDF"); 
</CFScript> 

<!--- This example shows the use of IsDate --->
<html>
<head>
<title>
IsDate Example
</title>
</head>

<body bgcolor = silver>
<H3>IsDate Example</H3>

<cfif IsDefined("FORM.theTestValue")>
  <cfif IsDate(FORM.theTestValue)>
  <H3>The string <cfoutput>#DE(FORM.theTestValue)#</cfoutput> 
   is a valid date</H3>
  <cfelse>
  <H3>The string <cfoutput>#DE(FORM.theTestValue)#</cfoutput> 
   is not a valid date</H3>
  </cfif>
</cfif>

<form action = "isDate.cfm" method = "POST">
<P>Enter a string, and discover if
it can be evaluated to a date value.

<P><input type = "Text" name = "TheTestValue" 
 value = "<cfoutput>#Now()#</cfoutput>">
<input type = "Submit" value = "Is it a Date?" name = "">
</FORM>

</body>
</html>
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