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Coldfusion Variable Checking / Setting Default

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  1. 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.
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  3.  
  4. 	<!--- Example of Coldfusion's IsDefined Function --->
  5.  
  6. 		<!--- This first way is probably easer to understand to newer 								programmers or people coming from other languages to CF. --->
  7.  
  8. 		<!--- Check if the form sent in a value, and if it didn't, then manually 				set it. Nothing too mindblowing huge here. --->
  9.  
  10. 	  <cfif isDefined("Form.firstname")>
  11. 	    <cfoutput>Hello, #Form.firstname#!</cfoutput>
  12. 	  <cfelse>
  13. 	    <cfoutput>Hello, stranger!</cfoutput>
  14. 	  </cfif>
  15.  
  16. 	<!--- Example of Coldfusions <cfparam> tag used instead --->
  17.  
  18. 		<!--- Using cfparam tag is evern easier, less code & more the 
  19. 		technically right way do this in CF (maybe?... lol )  ) --->
  20.  
  21.   		<cfparam name="Form.firstname" default="stranger">
  22. 		<cfoutput>Hello, #Form.firstname#!</cfoutput>
  23.  
  24.  
  25. 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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