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Radio Card

Figma GitHub

A type of radio input represented as a card.

The Radio Card is a form element (radio input) with a bigger target area represented by a card container that allows users to select a single item from a list of related options.

Usage

Use the Radio Card Group in most cases. Use individual Radio Cards only in special cases and sparingly.

When to use

  • To allow users to select a single option from a group of two or more Radio Cards.

When not to use

  • As a static card, use a Card
  • When a user could select multiple options, use a Checkbox

Control position

In most cases, we recommend using the bottom position. Still, we offer Radio Cards in a left position, which is a good option when the content in the cards is minimal.

Bottom

Left

Alignment

Left

Center

Nested badge

Badges can be used in radio cards to display additional information and context. To ensure proper usage of the badge component, refer to the guidelines.

Cluster type

Legend style

Default style

When placed along with other form components, we recommend using the default legend style provided by the component.

Default legend style

Display style

When using the Radio Card Group as its own section, we recommend using Display/400/Bold for the legend.

Display/400/Bold legend style

Error validation

For error validation recommendations, refer to the Form patterns documentation.

Content

Form::Label

Labels and link

Labels are part of the radio’s selectable area, making them interactive elements. This means that links inside labels are nested interactive elements and cannot be reached by assistive technology. If you plan to add links to radios, please contact the Design Systems Team for guidance.

For general content recommendations, refer to the Primitives documentation.

How to use this component

Form::RadioCard::Group creates:

  • a <fieldset> container
  • a <legend> element
  • a list of rendered <Form::RadioCard> components (with aria-describedby attributes automatically generated).

The <Hds::Form::RadioCard::Group> component does not provide the logic for handling the mutually exclusive nature of radio controls (when a Radio Card is checked, any other Radio Cards with the same name that were previously checked become unchecked). You can implement this yourself in an {{on "change" this.onChange}} function or manage the checked state of Radio Cards by updating the underlying data.

The @name argument offers an easy way to provide the same name for all the radio controls with a single declaration.

Create connection 
<Hds::Form::RadioCard::Group @name="radio-card-basic-example" @alignment="center" as |G|>
  <G.Legend>Create connection</G.Legend>
    <G.RadioCard @checked={{true}} {{on "change" this.onChange}} as |R|>
      <R.Icon @name="aws-color" />
      <R.Label>Quick peering with Quick Links</R.Label>
      <R.Badge @text="2-5 min" />
      <R.Description>Quick peering with quick links will provide the fastest way to connect to your providers’ network.</R.Description>
    </G.RadioCard>
    <G.RadioCard {{on "change" this.onChange}} as |R|>
      <R.Icon @name="aws-color" />
      <R.Label>Manual peering using AWS CLI</R.Label>
      <R.Badge @text="5-10 min" />
      <R.Description>Provide you AWS CLI template to apply connection settings.</R.Description>
    </G.RadioCard>
    <G.RadioCard {{on "change" this.onChange}} as |R|>
      <R.Icon @name="hcp" />
      <R.Label>Manual peering using HCP and AWS web console</R.Label>
      <R.Badge @text="30-60 min" />
      <R.Description>Manually follow UI instructions to complete configuring a connection at provider side.</R.Description>
    </G.RadioCard>
</Hds::Form::RadioCard::Group>

Custom content

Customizable options include:

  • Defining custom content using the Generic block
  • Defining a custom width using the maxWidth argument
  • Adding multiple Badge components
Cluster type 
<Hds::Form::RadioCard::Group @name="radio-card-custom-example" as |G|>
  <G.Legend>Cluster type</G.Legend>
  <G.RadioCard @checked={{true}} {{on "change" this.onChange}} as |R|>
    <R.Label>HCP-managed Consul</R.Label>
    <R.Badge @text="6 clusters left" />
    <R.Generic>
      <ul class="doc-radio-card-list-demo">
        <li class="hds-typography-display-100">Connect workloads in your cloud provider network with HCP</li>
        <li class="hds-typography-display-100">Offload Consul operations to Hashicorp Experts</li>
      </ul>
    </R.Generic>
  </G.RadioCard>
  <G.RadioCard {{on "change" this.onChange}} as |R|>
    <R.Label>Self-managed Consul</R.Label>
    <R.Badge @text="5 clusters left" />
    <R.Badge @text="Kubernetes only" @icon="kubernetes" />
    <R.Generic>
      <ul class="doc-radio-card-list-demo">
        <li class="hds-typography-display-100">Multi-cloud artifact registry</li>
        <li class="hds-typography-display-100">Golden images workflow</li>
        <li class="hds-typography-display-100">Terraform Cloud integration</li>
        <li class="hds-typography-display-100">10 free images/month</li>
        <li class="hds-typography-display-100">250 free requests/month</li>
      </ul>
    </R.Generic>
  </G.RadioCard>
</Hds::Form::RadioCard::Group>

Component API

Form::RadioCard

name string
The name attribute of the input control.
value string
The value attribute of the input control.
checked boolean
  • false (default)
The checked attribute of the input control.
disabled boolean
  • false (default)
The disabled attribute of the input control.
controlPosition enum
  • bottom (default)
  • left
Sets the position of the form control in relation to the Radio Card content.
alignment enum
  • left (default)
  • center
Sets the alignment of the Radio Card content.
layout enum
  • fluid (default)
  • fixed
By default, the Radio Card will expand to fit the parent container. When used in a group, the cards will equally share the width to fit the available space. If the @layout parameter is set to fixed, a @maxWidth value must be specified to constrain the card.
maxWidth string
any valid CSS width (%, vw, etc)
When used with a fluid layout, this parameter will determine the number of Radio Cards shown per row (for example 25% will result in 4 cards). When used with a fixed layout, this parameter will preserve the width of the card and wrap cards on multiple rows if necessary.
extraAriaDescribedBy string
An additional ID attribute to be added to the aria-describedby HTML attribute.

By default, the aria-describedby attribute is automatically generated by the component using the IDs of the helper text and errors (if they’re present). Use this argument if you need to pass an extra ID.
…attributes
This component supports use of ...attributes.

The attributes will be applied to the <input type="radio"> element. This means you can use all the standard HTML attributes of the <input type="radio"> element and all the usual Ember techniques for event handling, validation, etc.

Some examples of HTML attributes that you will likely use: id, name, value, checked, disabled (see whole list here) and some examples of Ember modifiers: {{on "click" [do something]}}, {{on "change" [do something]}}.

Contextual components

Icon, Label, Badge, Description, and Generic content are passed to the RadioCard as contextual components in this order, regardless of the declaration order.

<[R].Icon>
Yields an icon inside the Radio Card container. For details about its API, check the icon component.
<[R].Label> yielded component
A container that yields its content emphasized inside the Radio Card.

This component supports use of ...attributes.
<[R].Badge>
A badge inside the Radio Card container. For details about its API, check the Badge component.
<[R].Description> yielded component
A container that yields its content inside the Radio Card. The content can be a simple string or a more complex/structured one, in which case it inherits the text style.

This component supports use of ...attributes.
<[R].Generic> yielded component
A container that yields its content inside the Radio Card. The content does not inherit any styles and can be customized as desired.

This component supports use of ...attributes.

Form::RadioCard::Group

controlPosition enum
  • bottom (default)
  • left
Sets the position of the form control in relation to the Radio Card content.
alignment enum
  • left (default)
  • center
Sets the alignment of the Radio Card content.
name string
Sets the name attribute for each form control within the group.
isRequired boolean
  • false (default)
Appends a Required indicator next to the legend text and sets the required attribute on the controls when user input is required.
layout string
  • fluid (default)
  • fixed
By default, the Radio Cards will expand to fit the parent container and will equally share the width to fit the available space. If the @layout parameter is set to fixed, a @maxWidth value must be specified for each RadioCard to constrain them.

Contextual components

Legend, HelperText, RadioCard, and Error content are passed to the group as contextual components.

The group of elements is automatically wrapped in a <fieldset> element.

<[G].Legend> yielded component
An optional container that yields its content inside the <legend> element. The content can be a simple string, or a more complex/structured one (in which case it inherits the text style). For details about its API check the Form::Legend component.
<[G].HelperText> yielded component
A container that yields its content inside the "helper text" block (at group level). The content can be a simple string, or a more complex/structured one (in which case it inherits the text style). For details about its API, check the Form::HelperText component.

The id attribute of the element is automatically generated.
<[G].RadioCard> yielded component
Used to yield one or more Radio Cards inside the group. For details about its API, check the RadioCard component above.
<[G].Error> yielded component
Container that yields its content inside the "error" block (at group level). The content can be a simple string, or a more complex/structured one (in which case it inherits the text style). For details about its API, check the Form::Error component.

The id attribute of the Error element is automatically generated.
<[E].Message> yielded component
If the error is made of multiple messages, you can iterate over a collection of error messages yielding individual items using Error.Message.

Anatomy

Item

Radio Card item anatomy

Element Usage
Icon Optional
Label Optional, but requires an aria-label when no label is provided
Badge Optional
Card container Required
Description Optional
Custom content Optional
Control Required

Group

Anatomy of the Radio Card group

Element Usage
Legend Optional
Required indicator Optional
Helper text Optional
Radio Card Required
Error message Triggered by system

States

State example of the RadioCard

Conformance rating

Form::RadioCard

Conformant

Form::RadioCard is conformant when used as directed.

Form::RadioCard::Group

Conformant

Form::RadioCard::Group is conformant when used as directed.

Links within labels, helper text, or error text

If a link is used within a label, helper text, or error text, it will not be presented as a link to the user with a screen reader; only the text content is read out. We understand avoiding links within help/error text or labels may be impossible, but we recommend using this method sparingly.

Keyboard navigation

Tab

Move focus to the selected card. If nothing is selected, focus will move to the first Radio Card.

Keyboard tab focus in a RadioCard group

Navigate between Radio Cards. As the card is focused it also becomes selected.

Keyboard arrow key focus in a RadioCard group

Applicable WCAG Success Criteria

This section is for reference only, some descriptions have been truncated for brevity.

This component intends to conform to the following WCAG Success Criteria:

  • 1.3.1 Info and Relationships (Level A):
    Information, structure, and relationships conveyed through presentation can be programmatically determined or are available in text.
  • 1.3.2 Meaningful Sequence (Level A):
    When the sequence in which content is presented affects its meaning, a correct reading sequence can be programmatically determined.
  • 1.3.4 Orientation (Level AA):
    Content does not restrict its view and operation to a single display orientation, such as portrait or landscape.
  • 1.3.5 Identify Input Purpose (Level AA):
    The purpose of each input field collecting information about the user can be programmatically determined when the input field serves a purpose identified in the Input Purposes for User Interface Components section; and the content is implemented using technologies with support for identifying the expected meaning for form input data.
  • 1.4.1 Use of Color (Level A):
    Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.
  • 1.4.10 Reflow (Level AA):
    Content can be presented without loss of information or functionality, and without requiring scrolling in two dimensions.
  • 1.4.11 Non-text Contrast (Level AA):
    The visual presentation of the following have a contrast ratio of at least 3:1 against adjacent color(s): user interface components; graphical objects.
  • 1.4.12 Text Spacing (Level AA):
    No loss of content or functionality occurs by setting all of the following and by changing no other style property: line height set to 1.5; spacing following paragraphs set to at least 2x the font size; letter-spacing set at least 0.12x of the font size, word spacing set to at least 0.16 times the font size.
  • 1.4.3 Minimum Contrast (Level AA):
    The visual presentation of text and images of text has a contrast ratio of at least 4.5:1
  • 1.4.4 Resize Text (Level AA):
    Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.
  • 2.4.6 Headings and Labels (Level AA):
    Headings and labels describe topic or purpose.
  • 2.4.7 Focus Visible (Level AA):
    Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
  • 3.2.1 On Focus (Level A):
    When any user interface component receives focus, it does not initiate a change of context.
  • 3.2.2 On Input (Level A):
    Changing the setting of any user interface component does not automatically cause a change of context unless the user has been advised of the behavior before using the component.
  • 3.2.4 Consistent Identification (Level AA):
    Components that have the same functionality within a set of Web pages are identified consistently.
  • 3.3.2 Labels or Instructions (Level A):
    Labels or instructions are provided when content requires user input.
  • 4.1.1 Parsing (Level A):
    In content implemented using markup languages, elements have complete start and end tags, elements are nested according to their specifications, elements do not contain duplicate attributes, and any IDs are unique.
  • 4.1.2 Name, Role, Value (Level A):
    For all user interface components, the name and role can be programmatically determined; states, properties, and values that can be set by the user can be programmatically set; and notification of changes to these items is available to user agents, including assistive technologies.

Support

If any accessibility issues have been found within this component, let us know by submitting an issue.

Related

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