Numeric (ScreenField property): Difference between revisions
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This property sets or returns the Numeric attribute for a ScreenField. If a field is Numeric, only numeric values may be entered in the field. The Numeric attribute is | This property sets or returns the Numeric attribute for a ScreenField. If a field is Numeric, only numeric values may be entered in the field. The Numeric attribute is | ||
initially set for a field by the [[Screen class#AddField function|AddField method]]. | initially set for a field by the [[Screen class#AddField function|AddField method]]. | ||
==Syntax== | |||
===Syntax terms=== | |||
<dl> | |||
<dt>bool | |||
<dd>A Boolean enumeration. Valid values are True (default) and False. A value is numeric only if it is composed of the characters 0 through 9, plus (+), minus (-), or period (.). | |||
<dt>%sfield | |||
<dd>A reference to an instance of a ScreenField object. | |||
</dl> | |||
==Usage Notes== | |||
Regardless of the value of a field's Numeric attribute, the programmer can assign any type of value to the field. Enforcement of the Numeric attribute takes place only when a user enters data in the field. Some terminal emulators do not enforce numeric field restrictions, so the programmer should be aware that the value of a numeric field must still be checked for validity. | Regardless of the value of a field's Numeric attribute, the programmer can assign any type of value to the field. Enforcement of the Numeric attribute takes place only when a user enters data in the field. Some terminal emulators do not enforce numeric field restrictions, so the programmer should be aware that the value of a numeric field must still be checked for validity. | ||
Revision as of 20:24, 18 March 2011
This property sets or returns the Numeric attribute for a ScreenField. If a field is Numeric, only numeric values may be entered in the field. The Numeric attribute is initially set for a field by the AddField method.
Syntax
Syntax terms
- bool
- A Boolean enumeration. Valid values are True (default) and False. A value is numeric only if it is composed of the characters 0 through 9, plus (+), minus (-), or period (.).
- %sfield
- A reference to an instance of a ScreenField object.
Usage Notes
Regardless of the value of a field's Numeric attribute, the programmer can assign any type of value to the field. Enforcement of the Numeric attribute takes place only when a user enters data in the field. Some terminal emulators do not enforce numeric field restrictions, so the programmer should be aware that the value of a numeric field must still be checked for validity.