Form Radio Inputs

For cross browser consistency, <b-form-radio-group> and <b-form-radio> uses Bootstrap's custom radio input to replace the browser default radio input. It is built on top of semantic and accessible markup, so it is a solid replacement for the default radio input.

The individual radio inputs in radio input group can be specified via the options prop of <b-form-radio-group>, or via manual placement of the <b-form-radio> sub component.

<template>
  <div>
    <b-form-group label="Radios using <code>options</code>">
      <b-form-radio-group id="radios1" v-model="selected" :options="options" name="radioOpenions">
      </b-form-radio-group>
    </b-form-group>

    <b-form-group label="Radios using sub-components">
      <b-form-radio-group id="radios2" v-model="selected" name="radioSubComponent">
        <b-form-radio value="first">Toggle this custom radio</b-form-radio>
        <b-form-radio value="second">Or toggle this other custom radio</b-form-radio>
        <b-form-radio value="third" disabled>This one is Disabled</b-form-radio>
        <b-form-radio :value="{fourth: 4}">This is the 4th radio</b-form-radio>
      </b-form-radio-group>
    </b-form-group>

    <div class="mt-3">
      Selected: <strong>{{ selected }}</strong>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      selected: 'first',
      options: [
        { text: 'Toggle this custom radio', value: 'first' },
        { text: 'Or toggle this other custom radio', value: 'second' },
        { text: 'This one is Disabled', value: 'third', disabled: true },
        { text: 'This is the 4th radio', value: {fourth: 4} }
      ]
    }
  }
}
</script>

<!-- form-radio-1.vue -->

Feel free to mix and match options prop and <b-form-radio> in <b-form-radio-group>. Manually placed <b-form-radio> inputs will appear below any radio inputs generated by the options prop. To have them apper above the inputs generated by options, place them in the named slot first.

Options

Please see options in <b-form-select> docs for details on passing options (value array) to <b-form-radio-group>.

Size

Control the size of the radio text by setting the prop size to either sm for small or lg for large.

<template>
  <div>
    <b-form-group label="Small size radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          size="sm"
                          name="radiosSm">
      </b-form-radio-group>
    </b-form-group>

    <b-form-group label="Default size radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          name="radiosMd">
      </b-form-radio-group>
    </b-form-group>

    <b-form-group label="Large size radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          size="lg"
                          name="radiosLg">
      </b-form-radio-group>
    </b-form-group>

    <div class="mt-4">
      Selected: <strong>{{ selected }}</strong>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      selected: 'first',
      options: [
        { text: 'First radio', value: 'first' },
        { text: 'Second radio', value: 'second' },
        { text: 'Third radio', value: 'third' }
      ]
    }
  }
}
</script>

<!-- form-radio-size-1.vue -->

Note: the current Bootstrap V4.beta CSS does not correctly style the size of the radio indicator.

Inline or stacked

By default <b-form-radio> generates inline radio inputs. Set the prop stacked to make the radios appear one over the other.

<template>
  <div>
    <b-form-group label="Inline radios (default)">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          name="radioInline">
      </b-form-radio-group>
    </b-form-group>

    <b-form-group label="Stacked radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          stacked
                          name="radiosStacked">
      </b-form-radio-group>
    </b-form-group>

    <div class="mt-3">
      Selected: <strong>{{ selected }}</strong>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      selected: 'first',
      options: [
        { text: 'First radio', value: 'first' },
        { text: 'Second radio', value: 'second' },
        { text: 'Third radio', value: 'third' }
      ]
    }
  }
}
</script>

<!-- form-radio-stacked-1.vue -->

Button style radios

Render radios with the look of buttons by setting the prop buttons. Set the button variant by setting the button-variant prop to one of the standard Bootstrap button variants (see <b-button> for supported variants). The default button-variant is secondary.

The buttons prop has precedence over plain, and button-variant has no effect if buttons is not set.

Button style radios will have the class .active automatically applied to their label when they are in the checked state.

<template>
  <div>
    <b-form-group label="Button style radios">
      <b-form-radio-group id="btnradios1"
                          buttons
                          v-model="selected"
                          :options="options"
                          name="radiosBtnDefault" />
    </b-form-group>

    <b-form-group label="Button style radios with <code>outline-primary</code> variant and size <code>lg</code>">
      <b-form-radio-group id="btnradios2"
                          buttons
                          button-variant="outline-primary"
                          size="lg"
                          v-model="selected"
                          :options="options"
                          name="radioBtnOutline" />
    </b-form-group>

    <b-form-group label="Stacked button style radios">
      <b-form-radio-group id="btnradios3"
                          buttons
                          stacked
                          v-model="selected"
                          :options="options"
                          name="radioBtnStacked" />
    </b-form-group>
  </div>
</template>

<script>
export default {
  data () {
    return {
      selected: 'radio1',
      options: [
        { text: 'Radio 1', value: 'radio1' },
        { text: 'Radio 3', value: 'radio2' },
        { text: 'Radio 3 (disabled)', value: 'radio3', disabled: true },
        { text: 'Radio 4', value: 'radio4' }
      ]
    }
  }
}
</script>

<!-- form-radio-buttons.vue -->

Note: <b-form-radio-group> uses the HTML attribute data-toggle="buttons" to apply the button styling to the radios. This can cause a potential conflict if you are including Bootstrap V4's jQuery code in your project for other purposes. To get around this, you will need to exclude the Bootstrap V4 jQuery buttons plugin, and include only the other Bootstrap V4 jQuery plugins you reqwuire.

Non custom style radio inputs (plain)

You can have b-form-radio render a browser native radio input by setting the plain prop.

<template>
  <div>
    <b-form-group label="Plain inline radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          plain
                          name="plainInline" />
    </b-form-group>

    <b-form-group label="Plain stacked radios">
      <b-form-radio-group v-model="selected"
                          :options="options"
                          plain
                          stacked
                          name="plainStacked" />
    </b-form-group>
  </div>
</template>

<script>
export default {
  data () {
    return {
      selected: 'first',
      options: [
        { text: 'First radio', value: 'first' },
        { text: 'Second radio', value: 'second' },
        { text: 'Third radio', value: 'third' }
      ]
    }
  }
}
</script>

<!-- form-radio-plain-1.vue -->

Note: plain will have no effect if buttons is set.

Contextual States

Bootstrap includes validation styles for valid and invalid states on most form controls.

Generally speaking, you’ll want to use a particular state for specific types of feedback:

• 'invalid' is great for when there’s a blocking or required field. A user must fill in this field properly to submit the form.
• 'valid' is ideal for situations when you have per-field validation throughout a form and want to encourage a user through the rest of the fields.
• null Displays no validation state

To apply one of the contextual state icons on <b-form-radio>, set the state prop to 'invalid' (or false), 'valid' (or true), or null.

Note: contextual state is not supported for radios rendered in buttons mode.

Conveying contextual validation state to assistive technologies and colorblind users:

Using these contextual states to denote the state of a form control only provides a visual, color-based indication, which will not be conveyed to users of assistive technologies - such as screen readers - or to colorblind users.

Ensure that an alternative indication of state is also provided. For instance, you could include a hint about state in the form control's <label> text itself, or by providing an additional help text block (i.e. <b-form-feedbck>). Specifically for assistive technologies, invalid form controls can also be assigned an aria-invalid="true" attribute (see below).

ARIA aria-invalid attribute

When <b-form-radio> has an invalid contextual state (i.e. invalid) you may also want to set the <b-form-radio> prop aria-invalid to true.

Supported invalid values are:

• false (default) No errors detected
• true The value has failed validation.

aria-invalid is automatically set if state is invalid.

Radio component aliases

• <b-form-radio-group> can be used by the shorter alias <b-radio-group>.
• <b-form-radio> can be used by the shorter alias of <b-radio>.

Component Reference