Problem
Many popular JavaScript libraries (jQuery, Prototype, YUI, Mootools, etc) pass in a special HTTP header of "X-Requested-With" with all AJAX calls.
Solution
Use the getHttpRequestData() function to retrieve all the data sent from the client in the HTTP request to look for special headers that indicate an AJAX request.
Detailed explanation
Since most common JavaScript libraries send the custom "X-Requested-With" HTTP header with all AJAX calls, you can use the following UDF to determine if the current request was made via AJAX:
<cffunction name="isAjaxRequest" output="false"
returntype="boolean" access="public">
<cfset var headers = getHttpRequestData().headers />
<cfreturn structKeyExists(headers, "X-Requested-With") and
(headers["X-Requested-With"] eq "XMLHttpRequest") />
</cffunction>
You can now check to see if the current request was made via AJAX:
<cfif isAjaxRequest()>
Came from an AJAX call!
<cfelse>
Did not come from an AJAX call. :(
</cfif>
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