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For each of these modes, the different states below can apply:
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Interaction
The user clicks a radio button to select the related option. This deselects the previously-selected option.
Clicking an option which is already selected does not deselect it, but clicking a different option transfers the selection to that option.
Only one option can be selected in a group of radio buttons.
One option must always be selected.
A group of radio buttons behaves like a single control: using ‘tab’ focuses on the group container, and users can then cycle through the individual options using the arrow keys.
The radio can be selected by clicking on either the button or the label.
The radio will have a hovered state when hovering over either the button or the label.
The radio can be selected by clicking on will have an active state during the action of clicking either the button or the label.
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List options in a logical order:
Most likely to least likely to be selected.
Simplest to most complex operation.
Make the most likely or convenient radio button option the default.
If you need to have an unselected state, include a None option.
If you can't have a comprehensive list of all possible options, include an Other option.
Use a radio button when the options being presented are important enough to occupy all of the necessary screen space.
Do not use a radio button if:
You need to allow the user to make multiple selections. Use Checkboxes, because radio buttons only allow single-selection.
You need to present more than 8 options. Use a Dropdown menu.
The default option is recommended for most users in most situations. Consider a Dropdown list instead, which uses less space by not immediately showing all options.
There are only two mutually exclusive options. Combine them into a single Checkbox or Toggle switch. For example, use a checkbox for “I agree” (e.g. to terms and conditions) instead of two radio buttons for “I agree” and “I don’t agree”.
The options are numbers with fixed steps. Use a Slider.
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