A CF error handler for CFAJAX calls

When calling a CF function via CFAJAX, CF errors can be hard to debug. This technique allows a useful error message to be displayed via a popup, speeding the fault diagnosis:

1) In the CF functions page you are calling via cfajax, add a cferror tag:

<cferror template="error.cfm" type="exception">

2) In the location pointed to by the cferror tag, put as error handling code:

<cfsetting showdebugoutput="false">
<cfoutput>alert("#JSStringFormat("Error:" & Error.Diagnostics)#");</cfoutput>

Now CFAJAX thinks everything is ok when a CF error occurs; it renders the return to the page instead of the normal CFAJAX return JS (which would be nothing because an error occurred) and the popup shows.