radio button
{{short description|Graphical user interface control element}}
{{redirect|Option button|the key in Apple keyboards|Option key}}
{{more citations needed|date=November 2022}}
A radio button or option button{{Cite web |title=About Option Buttons |url=https://docs.oracle.com/cd/E14004_01/books/Fundamentals/fund_aboutrecordsfields006.htm |access-date=2025-02-02 |website=docs.oracle.com}} is a graphical control element that allows the user to choose only one of a predefined set of mutually exclusive options. The singular property of a radio button makes it distinct from checkboxes, where the user can select and unselect any number of items.
Radio buttons are arranged in groups of two or more and displayed on screen as, for example, a list of circular holes that can contain white space (for unselected) or a dot (for selected). Each radio button is normally accompanied by a label describing the choice that the radio button represents. The choices are mutually exclusive; when the user selects a radio button, any previously selected radio button in the same group becomes deselected (making it so only one can be selected). Selecting a radio button is done by clicking the mouse on (or touching the screen over) the button, or the caption, or by using a keyboard shortcut.
Etymology
File:Car Radio of Analog Era.jpg
Radio buttons were named after the physical buttons used on older radios to select preset stations{{cite web|last1=Yumashev|first1=Alex|title=The history of a radio-button|url=https://www.jitbit.com/alexblog/242-the-history-of-a-radio-button/|website=JitBit Founders Blog|access-date=14 September 2016}}{{cite web|title=Radio Buttons|url=https://msdn.microsoft.com/en-us/library/windows/desktop/dn742436(v=vs.85).aspx|website=Windows Dev Center|access-date=14 September 2016}} – when one of the buttons was pressed, other buttons would pop out, leaving the pressed button the only button in the "pushed in" position.
HTML
In web forms, the HTML element {{code|lang=html|code=}} is used to display a radio button. Example:
A group of attributes is defined by name. In one group, only one radio button can be chosen.
Unicode
Version 6 of the Unicode standard includes a character designated to represent a radio button, (🔘) at code point 128,280 (U+1F518), found in the [https://www.unicode.org/charts/PDF/U1F300.pdf Miscellaneous Symbols and Pictographs] section. Similar characters are the mathematical operator {{unichar|2299|circled dot operator}} as well as {{unichar|25c9|fisheye}} and {{unichar|25CE|bullseye}}.
The font Wingdings 2 contains at position 153 and 158 glyphs that look like radio buttons.
See also
References
{{Reflist}}
External links
- {{IETF RFC|1866}}: the HTML 2.0 specification, which defined radio buttons on the web.
- [http://www.w3.org/TR/html401/interact/forms.html#radio W3 HTML 4.01 Specification]
- Usage of radio buttons in [http://java.sun.com/docs/books/tutorial/uiswing/components/button.html#radiobutton Sun's Java Programming Tutorial]
- {{cite web |url=http://www.useit.com/alertbox/20040927.html |title=Checkboxes vs. Radio Buttons |last=Nielsen |first=Jakob |author-link=Jakob Nielsen (usability consultant) |date=September 27, 2004 |website=Nielsen Norman Group |location=[Fremont, California] |type=article |access-date=November 12, 2014}}
{{Graphical control elements}}