@commercetools-uikit/accessible-button

AccessibleButton

A React component that you can use to wrap your buttons in an accessibile <button/> element.

How to use it?

The AccessibleButton component is intended to be used as a wrapper for your actual button component.

import AccessibleButton from '@commercetools-uikit/accessible-button';

const Button = props => (
  <AccessibleButton
    label={props.label}
    onClick={props.onClick}
    isToggled={props.isToggled}
    isDisabled={props.isDisabled}
    className={styles.button}
  >
    <div className={styles.default}>
      {Boolean(props.iconLeft) && props.iconLeft}
      <span>{props.label}</span>
    </div>
  </AccessibleButton>
);
Button.propTypes = {
  label: PropTypes.string.isRequired,
  iconLeft: PropTypes.node,
  /* set to true or false to indicate a toggle button */
  isToggled: PropTypes.bool,
  isDisabled: PropTypes.bool,
  onClick: PropTypes.func.isRequired,
};

Button.displayName = 'Button';

export default Button;

Prop Types

Property	Type	Required?	Description
id	String	-	Used as the HTML id attribute.
type	String	-	Used as the HTML type attribute. Supported values are submit, reset and button.
label	String	✓	The text that should be used as aria-label
children	Node	✓	Button content
isToggled	Bool	-	Set this prop to indicate a toggle button and it's state
ref	React ref	-	Used as button reference
isToggleButton	Bool	-	Used to set `aria-pressed˚ state
isDisabled	Bool	-	Set this prop to indicate a disabled button
onClick	Function	✓	Callback that is called when the button is clicked
buttonAttributes	Object	-	Attributes to be applied to the <button/> element. Can be use to e.g. add data-* attributes to the button.

How does it work?

Using a <button/>

If you can use a native HTML element or attribute with the semantics and behaviour you require already built in, instead of re-purposing an element and adding an ARIA role, state or property to make it accessible, then do so.

This means that instead of using a <div/> to create a button we should use the <button/> element.

The problem with using the <button/> element for creating a button is that in some browsers the <button/> element cannot be used as a flex container.

To solve both problems at once we need to nest a <div/> inside the <button/>. This <div/> contains the actual button content, like the label and/or an icon.

Toggle buttons

In order to indicate to screenreaders that a button is a toggle button — meaning that it will keep the active state once clicked — you need to set the aria-pressed attribute accordingly.

This is automatically done when you specify the isToggled property. If this prop is omitted though we don't set the aria-pressed attribute at all so screenreaders to not mistake our button for a togglable button.

Icon buttons

In order for screenreaders to know what a button does we need to provide a proper label. The <button/> element is able to figure out the aria-label on its own for simple buttons that only contain text.

For buttons that contain an icon however the default aria-label would also contain the icon, which probably our screenreader does not know how to read out 😉.

So we need to manually set the aria-label attribute. You need to do so by providing the label prop.

Disabled buttons

In order for screenreaders to know if your button is disabled we need to set the aria-disabled and disabled attributes on the button. We do so automatically if you set the isDisabled prop to true.

References

• Rules for using ARIA in HTML by Ire Aderinokun
• Using the button role by MDN
• Flexbugs by Philip Walton