Support JSONP in Coldfusion

Let say you already have a Coldfusion page that serves JSON data to your AJAX web application, now you want to support JSONP from cross domain client call. Here is the code snippet that will do it:

	<!--- if present, indicates this is a JSONP crosssite invocation --->
	<cfparam name="callback" type="string" default="">
	<cfparam name="jsonp" type="string" default="">
	<!--- your code, variable "result" will be the json data for caller --->
	<cfif callback NEQ ''>
	<!--- JSONP --->
	<cfoutput>#callback#(#serializeJSON(result)#);</cfoutput>
	<cfelseif jsonp NEQ ''>
	<!--- JSONP --->
	<cfoutput>#jsonp#(#serializeJSON(result)#);</cfoutput>
	<cfelse>
	<!--- the old way --->
	<cfoutput>#serializeJSON(result)#</cfoutput>
	</cfif>

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