Is is possible to set a session variable in Application.cfc and then retrieve it from any of the application pages?

Question

Is is possible to set a session variable in Application.cfc and then retrieve it from any of the application pages?

3.5k Views Asked by John At 08 November 2011 at 14:18

With the example I have provided I would like for the index.cfm to display hello How can I do this?

Application.cfc

<cfcomponent>
    <cfset this.sessionManagement = true /> 

    <cffunction name="onSessionStart">
        <cfset SESSION.myVar = "hello">
    </cffunction>

</cfcomponent>

index.cfm

<html>
    <head>

    <title>Testing</title>

    </head>

    <body>
        <cfoutput>#SESSION.myVar#</cfoutput>
    </body>
</html>

~~I have discovered that when I add~~

~~<cfinvoke component="Application" method="onSessionStart">~~

~~to the index.cfm it works, however all the variable gets overridden every time the page is refreshed.~~

Original Q&A

There are 3 best solutions below

Pete Freitag On 08 November 2011 at 15:06

Yes you can set variables in onSessionStart and use them in the application. The onSessionStart function only fires when a new session is created, so if it is being called on every request then your sessions are not persisting (your CFID / CFTOKEN, JSESSIONID) is not being passed on to subsequent requests. This is probably due to cookies being disabled.

Eric Belair On 08 November 2011 at 15:06

I'm assuming that you're new to ColdFusion or at least Application.cfc, but yes, onSessionStart is the basic way to initiate Session variables in your Application. Of course, they can be set/deleted/reset in any other page, so it might be good pratice to check for the existence of the variable in the SESSION scope before outputting it:

<cfif StructKeyExists(SESSION, "myVar")>
    <cfoutput>#SESSION.myVar#</cfoutput>
</cfif>

If the variable is not persisting, have you checked your Session Timeout setting (in ColdFusion Administrator)? You can set it there, which sets a default for all applications on the server, or you can set it right in Application.cfc:

THIS.SessionTimeout = CreateTimeSpan(0, 1, 0, 0); // One hour Session Timeout

**Adam Cameron** · Accepted Answer · 2011-11-08T15:11:51.520000

Adam Cameron On 08 November 2011 at 15:11 BEST ANSWER

You need to give your application a name, eg:

<cfset this.name = "foo">

In your Application.cfc pseudo-constructor. Otherwise CF can't create an application, and so it cannot associate the session with the application.

Is is possible to set a session variable in Application.cfc and then retrieve it from any of the application pages?

There are 3 best solutions below

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