CFML Reference
ColdFusion Functions

IsBoolean

Description

Determines whether a value can be converted to Boolean.

Return value

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

Category

Decision functions

Syntax

IsBoolean(value)

See also

IsNumeric, YesNoFormat

Parameters

Parameter	Description
value	Number or string

Example

<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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