singleoption

Singleoption is a term used in software design to describe a construct that allows exactly one choice from a defined set of alternatives. The concept appears across user interfaces, data modeling, and API design, and how it is implemented can vary by context.

In user interfaces, a singleoption control restricts input to a single selection. Common implementations include radio button groups and single-select dropdown menus. The goal is to prevent multiple simultaneous selections and to make the chosen option explicit. In contrast, a multi-option or multi-select control permits choosing more than one item. Clear labeling and accessible focus handling are important for the singleoption control to function well for all users.

In data modeling and APIs, singleoption is often represented by a value from a closed set, such as an enumeration or a discriminated union. This conveys that a parameter or field must take exactly one value from a predefined list. Design considerations include the handling of a default option, validation rules, and how to express “no value” when appropriate (for example, using optional types).

Practical concerns include usability, accessibility, and internationalization. Designers should ensure keyboard operability, screen reader compatibility, and consistent behavior across platforms. Although not a formal standard, the term singleoption captures the intent to enforce a single, explicit choice in a given context. See also: single-select, radio button, enum.