Aruba Networks PowerConnect W Clearpass 100 Software Deployment Manual page 251

A comparison of these two approaches is shown below to illustrate the difference:
When using a Conversion or Value Format function, you will almost always have to set up a Display
Function for the form field. This function is used to perform the conversion in the reverse direction –
between the internal stored value and the value displayed in the form field.
See "Form Field Conversion Functions" in the Reference chapter for a detailed list of the options available
to you for the Conversion and Value Format functions.
The Display Param is the name of a form field, the value of which will be passed to the Display Function.
In almost all cases this option should contain the name of the form field.
Display Arguments are available for use with a form field and are used to control the conversion process. In
the case of the expire_time form field, the Display Function is set to NwaDateFormat to perform a
conversion from a UNIX time to a date/time string, and the Display Argument specifies the format to use for
the conversion.
See "Form Field Display Formatting Functions" in the Reference chapter for a detailed list of the options
available to you for the Display Function and Static Display Function.
The Enable If and Visible If options in the form field editor allow you to specify JavaScript expressions.
The result obtained by evaluating these expressions is used to enable/disable, or show/hide the form field in
real time, while an operator is using the form.
Unlike the other parts of the form field editor, the Enable If and Visible If expressions are evaluated by
the operator's Web browser. These expressions are not used by the server for any other purpose.
The expression must be a Boolean expression in the JavaScript language; statements and other code should
not be included as this will cause a syntax error when the form is displayed in a Web browser.
ClearPass Guest 3.9 | Deployment Guide Guest Management | 251