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nehringryan on 04/29/11

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Coldfusion Variable Checking / Setting Default

/ Published in: ColdFusion

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Need to make sure a variable exists in Coldfusion? Use one of the options below to first check for a value passed from the server/form/whatever.  If none is sent, for any reason whatsoever (var error, db error, net hiccup etc...), this code  will ensure you still have a variable with a valid defaulted value to ensure 1 problem doesn't become 2.

<cfif isDefined("Form.firstname")>
	    <cfoutput>Hello, #Form.firstname#!</cfoutput>
	  <cfelse>
	    <cfoutput>Hello, stranger!</cfoutput>
	  </cfif>

<cfparam name="Form.firstname" default="stranger">
		<cfoutput>Hello, #Form.firstname#!</cfoutput>

One clean, little, and simple to remember Coldfusion tag replaces a "CFIF"      conditional process & all the declararative code you'd need to set those values by hand.This is a pretty small example, but the implications are pretty apparent if you had to check maybe 20 variables etc.

URL: http://ryannehring.com/

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