Web+ Tutorial

Lesson 2.3 - Validating Input with Parameter-Checking Functions

Description

The following functions are useful for verifying that a user has submitted data to your script in the correct format.

Syntax

#ParameterExists (Param)#
#IsDate (Param)#
#IsNumeric (Param)#

Agument

Param refers to any parameter which may have been submitted to the script.

Example

Sample

<webPrint>
   ParameterExists (lesson) = #ParameterExists (lesson)#<br>
   ParameterExists (LastName) = #ParameterExists (LastName)#<br>
   <webSet #x# = "57">
   IsNumeric (x) = #IsNumeric (x)#<br>
   IsDate (x) = #IsDate (x)#
</webPrint>

Result:

Exercise

You can try out some Web+ code of your own here.