Returns TRUE if value can be converted to a Boolean; otherwise, FALSE.
IsBoolean(value)
Parameter |
Description |
---|---|
value |
A number or string |
<!--- This example shows the use of IsBoolean ---> <html> <head> <title> IsBoolean Example </title> </head> <body bgcolor = silver> <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" method = "POST"> <P>Enter an expression, and discover if it can be evaluated to a Boolean value. <input type = "Text" name = "TheTestValue" value = "1"> <input type = "Submit" value = "Is it Boolean?" name = ""> </FORM> </body> </html>