Radio buttons¶

Usage¶

Radio buttons can be used where a user has to make a mutually exclusive selection, e.g. in forms, modals, side panel, settings and more.

Best practices¶

• The list of options should be structured in a logical order, e.g. from simplest operation to the most complex one or least to most risk.
• Options should be comprehensive and clearly distinct.
• Radio buttons should always have exactly one option pre-selected. Select the safest and most secure option (e.g. to prevent data loss).
• If users need to be able to skip any selection, provide a radio button for this choice labeled as "None".
• Avoid nesting radio buttons with other radio buttons or checkboxes. Keep all options at the same level to avoid confusion.
• For selecting multiple options, use the checkbox component instead.

Design¶

Interaction states¶

When possible, arrange the radio button groups vertically for easier reading.

Labels¶

Always use clear and concise labels for radio buttons. Labels should always be placed to the right of radio button inputs.

If labels are too extensive, try to reworded them to be shorter. If it's not possible, wrap the text to a second line so the radio button and label are top aligned.

Code¶

In Element, radio buttons are created using the native <input type="radio"> element. They should be used together with the si-form-item component (see here). Like checkboxes, they are styled using the form-check-input class.

<si-form-item label="Radio button">
  <input type="radio" class="form-check-input" [formControl]="control">
</si-form-item>

The class form-check-input and type="radio" must be applied to ensure correct visual appearance. Instead of formControl, you can also use ngModel.

Group radio buttons¶

Use the si-form-fieldset component to group multiple radio buttons together. It will ensure a correct layout and apply the necessary accessibility attributes.

<si-form-fieldset label="Group">
  <si-form-item label="Option 1">
    <input type="radio" class="form-check-input" [formControl]="control1">
  </si-form-item>
  <si-form-item label="Option 2">
    <input type="radio" class="form-check-input" [formControl]="control2">
  </si-form-item>
</si-form-fieldset>

By default, the radio buttons are stacked vertically. To display them inline, apply the form-check-inline class to the si-form-item:

<si-form-fieldset label="Group Inline">
  <si-form-item label="Option 1" class="form-check-inline">
    <input type="radio" class="form-check-input" [formControl]="control1">
  </si-form-item>
  <si-form-item label="Option 2" class="form-check-inline">
    <input type="radio" class="form-check-input" [formControl]="control2">
  </si-form-item>
</si-form-fieldset>

Native HTML markup¶

If a si-form-item component cannot be used, it is also possible to use a radio button with native HTML elements only:

<div class="form-check">
  <input type="radio" id="check-id" class="form-check-input">
  <label for="check-id" class="form-check-label">Radio button</label>
</div>

In this case, all the attributes shown above must be set by an application. Otherwise, the radio button may appear broken.

To create an inline radio button, additionally apply the form-check-inline class to the form-check div.

Example¶