IsBoolean

Determines whether a value can be converted to Boolean

True, if the parameter can be converted to Boolean; False, otherwise.

Decision functions

IsBoolean(value)

IsNumeric, YesNoFormat

Parameter Description

value

Number or string

 

<h3>IsBoolean Example</h3>

<cfif IsDefined("FORM.theTestValue")>
   <cfif IsBoolean(FORM.theTestValue)>
      <h3>The expression <cfoutput>#DE(FORM.theTestValue)#</cfoutput> is 
Boolean</h3>
   <cfelse>
      <h3>The expression <cfoutput>#DE(FORM.theTestValue)#</cfoutput> is not Boolean</h3>
   </cfif>
</cfif>

<form action = "isBoolean.cfm">
<p>Enter an expression, and discover whether it can be evaluated to a
Boolean value.

<input type = "Text" name = "TheTestValue" value = "1">
<input type = "Submit" value = "Is it Boolean?" name = "">
</form>

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