User Guide

528 Chapter 3: ColdFusion Functions
IsBoolean
Description
Determines whether a value can be converted to Boolean
Returns
True, if the parameter can be converted to Boolean; False, otherwise.
Category
Decision functions
Function syntax
IsBoolean(value)
See also
IsNumeric, YesNoFormat
Parameters
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>
Parameter Description
value Number or string