Cfargument: required and default attributes
Written on 11 January 2012, 03:30pm
Tagged with: coldfusion
Just noting an interesting observation about the attributes of the cfargument
tag.
What happens if you set the required="true"
attribute, but also the default
attribute?
The answer is in the documentation: if passed, the ‘default
‘ attribute is used, and the ‘required
‘ attribute is ignored.
required (optional, default=’no’):
Specifies whether the parameter is required to execute the component method. The parameter is not required if you specify a default attribute.
-link
An example below:
dummy.cfc:
<cfcomponent>
<cffunction name="add">
<cfargument name="a" required="true" type="string" default="1" />
<cfargument name="b" required="true" type="string" default="1" />
<cfreturn a+b>
</cffunction>
</cfcomponent>
dummy.cfm:
<cfinvoke component="dummy"
method="add"
returnVariable="sum" />
<cfoutput>#sum#</cfoutput>
The example below will still output 2, even if we call the ‘add’ method without any argument. The default values are used.
Written by Dorin Moise (Published articles: 277)
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