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, IsValid, 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>