Radio

Bootstrap 5 Radio component

A Radio Button is a component used to allow a user to make a single choice among a number of options (whereas Checkboxes are used for selecting multiple options).

Basic example

Browser default checkboxes and radios are replaced with the help of .form-check, a series of classes for both input types that improves the layout and behavior of their HTML elements, that provide greater customization and cross browser consistency. Checkboxes are for selecting one or several options in a list, while radios are for selecting one option from many.

Structurally, our <input>s and <label>s are sibling elements as opposed to an <input> within a <label>. This is slightly more verbose as you must specify id and for attributes to relate the <input> and <label>.

We use the sibling selector (~) for all our <input> states, like :checked or :disabled. When combined with the .form-check-label class, we can easily style the text for each item based on the <input>'s state.

Edit in sandbox 
<!-- Default radio -->
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDefault" id="flexRadioDefault1"/>
  <label class="form-check-label" for="flexRadioDefault1"> Default radio </label>
</div>

<!-- Default checked radio -->
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDefault" id="flexRadioDefault2" checked/>
  <label class="form-check-label" for="flexRadioDefault2"> Default checked radio </label>
</div>

Disabled

Add the disabled attribute and the associated <label>s are automatically styled to match with a lighter color to help indicate the input’s state.

Edit in sandbox 
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDisabled" id="flexRadioDisabled" disabled />
  <label class="form-check-label" for="flexRadioDisabled"> Disabled radio </label>
</div>

<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDisabled" id="flexRadioCheckedDisabled" checked disabled/>
  <label class="form-check-label" for="flexRadioCheckedDisabled">Disabled checked radio</label>
</div>

Inline

Group checkboxes or radios on the same horizontal row by adding .form-check-inline to any .form-check.

Edit in sandbox 
<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1" />
  <label class="form-check-label" for="inlineRadio1">1</label>
</div>

<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio2" value="option2" />
  <label class="form-check-label" for="inlineRadio2">2</label>
</div>

<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio3" value="option3" disabled />
  <label class="form-check-label" for="inlineRadio3">3 (disabled)</label>
</div>

Without labels

Omit the wrapping .form-check for checkboxes and radios that have no label text. Remember to still provide some form of label for assistive technologies (for instance, using aria-label).

Edit in sandbox 
<div>
  <input class="form-check-input" type="radio" name="radioNoLabel" id="radioNoLabel1" value="" aria-label="..." />
</div>

<div>
  <input class="form-check-input" type="radio" name="radioNoLabel" id="radioNoLabel2" value="" aria-label="..." />
</div>

Toggle buttons

Toggle buttons can be grouped in a button group if needed.

Edit in sandbox 
<div class="btn-group">
  <input type="radio" class="btn-check" name="options" id="option1" autocomplete="off" checked />
  <label class="btn btn-secondary" for="option1" data-mdb-ripple-init>Checked</label>

  <input type="radio" class="btn-check" name="options" id="option2" autocomplete="off" />
  <label class="btn btn-secondary" for="option2" data-mdb-ripple-init>Radio</label>

  <input type="radio" class="btn-check" name="options" id="option3" autocomplete="off" />
  <label class="btn btn-secondary" for="option3" data-mdb-ripple-init>Radio</label>
</div>
// Initialization for ES Users
import { Ripple, initMDB } from "mdb-ui-kit";

initMDB({ Ripple });